Shengmei Zhao's research while affiliated with Nanjing University of Posts and Telecommunications and other places
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Publications (129)
In order to mitigate the stochastic interference of underwater channels and improve the quality of underwater communication systems, it is essential to study the performance of the underwater wireless optical communication (UWOC) links utilizing vortex beams with unique attributes. In this paper, the analytical formulae for the bit error rate (BER)...
Based on the Rytov approximation theory, the analytical formulae for the mode detection probability and channel capacity of the partially coherent pin-like optical (PCPO) vortex beams propagating in oceanic turbulence are obtained. The effects of light source parameters and oceanic turbulence parameters on the transmission characteristics of the PC...
The degradation of imaging quality caused by environmental noise during Fourier single pixel imaging (FSPI) is a big problem. In this paper, we propose simple and efficient denoised single-pixel imaging schemes by using linear filters to reduce the impact. Two filters, such as an average filter and Gaussian filter, are employed, and their correspon...
Orbital angular momentum (OAM) holography has recently been emerged and recognized as an essential technique for achieving ultrahigh capacity data transmission, data storage, encryption, and digital holographic microscopy. However, its application on grayscale image displaying is less reported. In this paper, we propose a grayscale image displaying...
In this study, we introduce a novel approach for dynamic micro-vibration measurement, employing an Orbital Angular Momentum (OAM) interferometer, where the reference beam is Gaussian (GS) and the measurement beam is OAM. The OAM light reflected back from the target carries information about the target’s vibrations. The interference of the OAM light...
Quantum architecture search (QAS) is desired to construct a powerful and general QAS platform that can significantly accelerate quantum advantages in error-prone and depth-limited quantum circuits in today’s Noisy Intermediate-Scale Quantum era. In this paper, we propose an evolutionary-based quantum architecture search (EQAS) scheme for the optima...
Measuring the orbital-angular-momentum (OAM) complex spectrum of light is very important in OAM-based applications. In this paper, we propose and experimentally demonstrate a simple scheme to measure the OAM complex spectrum of light with the fast Fourier transform (FFT). The light with input OAM modes coaxially interferes with a Gaussian light bea...
In the paper, we propose a domain adaptation (DA) scheme based on the hybrid classical-quantum neural network, named hybrid DA. There are four parts, including the classical convolutional neural network part, the label predictor part based on quantum neural network (QNN), the domain classifier part based on QNN, and the gradient reversal layer part...
Holographic data storage (HDS) has emerged as a promising technology for high-capacity data storage. In this study, we propose a novel approach to enhance the storage density in HDS through a multiplexing perfect optical vortex (POV) hologram. By utilizing the orthogonality property of POV, different POV-recording holograms can be multiplexed to st...
In this paper, we propose a multiple images simultaneous encryption scheme by encrypting the orbital angular momentum (OAM) holography with ghost imaging. By controlling the topological charge of the incident OAM light beam on the OAM-multiplexing hologram, different images can be selectively obtained for ghost imaging (GI). Followed by the random...
The optical micro-displacement sensor is one of the cornerstones of quality control in modern nanotechnological devices, lithography, and high-accuracy localization. However, it is a technical challenge to directly achieve the object's displacement, velocity, and direction simultaneously. Here, we propose a fractional orbital angular momentum (FOAM...
Twin-field quantum key distribution (TF-QKD) is known for its capacity of overcoming the fundamental rate-distance limit of QKD, and a variety of its variants have been derived. One of them, the phase-matching quantum key distribution (PM-QKD) not only inherits the high rate-distance capacity, but also outperforms the original TF-QKD. Moreover, the...
Orbital angular momentum (OAM) has been widely used in underwater wireless optical communication (UWOC) systems due to the mutual orthogonality between modes. However, wavefront distortion caused by oceanic turbulence (OT) on the OAM mode seriously affects its mode recognition and communication quality. In this work, we propose a hybrid opto-electr...
Quantum architecture search (QAS) is desired to construct a powerful and general QAS platform which can significantly accelerate quantum advantages in error-prone and depth limited quantum circuits in today Noisy Intermediate-Scale Quantum (NISQ) era. In this paper, we propose an evolutionary-based quantum architecture search (EQAS) scheme for the...
In this paper, we present an edge detection scheme based on ghost imaging (GI) with a holistically-nested neural network. The so-called holistically-nested edge detection (HED) network is adopted to combine the fully convolutional neural network (CNN) with deep supervision to learn image edges effectively. Simulated data are used to train the HED n...
We consider a nonlinear discrete-time quantum walk whose coin operator temporally changes according to periodic, Fibonacci quasiperiodic, and random sequences, respectively. Three distinguished nonlinearity regimes are numerically found, where transport spreading behaviors are similar to that of linear quantum walks, traveling soliton-like behavior...
The ideal measurement-device-independent quantum key distribution (MDI-QKD), which is immune to all detector side-channel attacks, is built on the Bell state measurement of two single-photon states. However, in practical MDI-QKD where phase-randomized weak coherent pulses (PR-WCPs) are used, the mismatch between states preparation and measurement i...
Using the properties of quantum superposition, we propose a quantum classification algorithm to efficiently perform multi-class classification tasks, where the training data are loaded into parameterized operators which are applied to the basis of the quantum state in quantum circuit composed by sample register and label register, and the parameter...
We propose a phase-matching quantum key distribution (PM-QKD) protocol based on orbital angular momentum (OAM) to exceed the linear key-rate bound without quantum repeater in the paper, named OAM-PM-QKD protocol, where the coherent state consisting of OAM with opposite topological charges is used as the information carrier. With the equivalent enta...
In this study, we propose a scheme to capture the amplitude and phase profile of the orbital angular momentum (OAM) beam based on coherent detection. In the scheme, the OAM beam to be measured is interfered with a local plain wave which is prepared at the receiver, and two charge-coupled devices (CCDs) are used to record the constructive and destru...
(n,n)$ ( n , n ) secret sharing is a procedure for splitting the key into several pieces so that no subset is sufficient to read the encrypted message except the entire one. In this paper, we propose a novel, to the best of our knowledge, secret sharing scheme based on spread spectrum ghost imaging (SSGI). In the scheme, a dealer divides a secret k...
In this Letter, we propose an orbital angular momentum (OAM) sensor to simultaneously measure the dynamic micro-displacement and the direction of a moving object in real time. The micro-displacement of the moving object can be detected by the calculation of the petals' rotation angle caused by the coaxial interference between the measured OAM beam...
Vortex beam carrying orbital angular momentum (OAM) is disturbed by oceanic turbulence (OT) when propagating in underwater wireless optical communication (UWOC) system. Adaptive optics (AO) is a powerful technique used to compensate for distortion and improve the performance of the UWOC system. In this work, we propose a diffractive deep neural net...
Phase-matching quantum key distribution (PM-QKD), a practical version of twin-field quantum key distribution (TF-QKD), is able to surpass the linear bound without quantum repeaters. Implementing PM-QKD through free space can guarantee two parties to share unconditionally secure keys between ground stations and mobile platforms. However, atmospheric...
In the paper, a gradient-free optimization algorithm for single-qubit quantum classifier is proposed to overcome the effects of barren plateau caused by quantum devices. A rotation gate RX({\phi}) is applied on a single-qubit binary quantum classifier, and the training data and parameters are loaded into {\phi} with the form of vector-multiplicatio...
Twin-field quantum key distribution (TF-QKD) has attracted considerable attention because it can exceed the basic rate-distance limit without quantum repeaters. Its variant protocol, sending or not-sending quantum key distribution (SNS-QKD), not only fixes the security vulnerability of TF-QKD, but also can tolerate large misalignment errors. Howeve...
Discrete-time quantum walks are Floquet systems if the quantum walk operator is independent of time. We consider such one-dimensional quantum walks with two quantum coin operators arranged in discrete space according to periodic, Fibonacci quasiperiodic and random sequences. We explore the correlation dimension of Floquet quasienergy spectrum, Floq...
Twin-field quantum key distribution (TF-QKD) is a hot topic in the field of quantum information due to its potential to break the key rate linear bound. Among all the variants, the single-photon entanglement-based phase-matching QKD protocol (SEPM-QKD) has been proposed, which is an entangled version of TF-QKD. However, a significant defect of SEPM...
Using the properties of quantum superposition, we propose a quantum classification algorithm to efficiently perform multi-class classification tasks, where the training data are loaded into parameterized operators which are applied to the basis of the quantum state in quantum circuit composed by \emph{sample register} and \emph{label register}, and...
![The detailed quantum circuit of Qi\documentclass[12pt]{minimal}...](publication/358673719/figure/fig2/AS:1139508951158789@1648691513294/The-detailed-quantum-circuit-of-Qidocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
In this paper, we propose a quantum algorithm to efficiently perform locality preserving projection (LPP) for dimensionality reduction, named quantum locality preserving projection (QLPP). We present QLPP in 4 steps and give their corresponding quantum circuits. Furthermore, we give an improved algorithm to construct the density matrix proportional...
As a variant of the twin-field quantum key distribution (TF-QKD), the sending-or-not twin-field quantum key distribution (SNS TF-QKD) is famous for its higher tolerance of misalignment error, in addition to the capacity of surpassing the rate–distance limit. Importantly, the free-space SNS TF-QKD will guarantee the security of the communications be...
Vortex beam carrying orbital angular momentum (OAM) is disturbed by oceanic turbulence (OT) when propagating in underwater wireless optical communication (UWOC) system. Adaptive optics (AO) is used to compensate for distortion and improve the performance of the UWOC system. In this work, we propose a diffractive deep neural network (DDNN) based AO...
In the letter, we propose a holographic data storage method based on orbital angular momentum (OAM). In the proposed method, the OAM holography by discovering strong OAM selectivity in the spatial-frequency domain without a theoretical helical mode index limit is used to label different data pages. Each data page’s points and intensity levels are u...
Ghost imaging (GI) has attracted more and more attention due to its non-locality, however, there are still some obstacles to its practical applications. One problem is that the environmental interference, such as the time varying noise, greatly degrades the reconstructed images’ quality. In the paper, we propose a novel ghost imaging scheme based o...
Based on the extended Huygens–Fresnel principle and the power spectrum of anisotropic oceanic turbulence, the analytical expressions of the average intensity and coherence properties of an off-axis hollow Gaussian-Schell model (OAHGSM) vortex beam propagating through anisotropic oceanic turbulence were derived. The effects of turbulent ocean and be...
![The schematic diagram of the P&P\documentclass[12pt]{minimal}...](publication/354870279/figure/fig1/AS:11431281118360503@1675740601719/The-schematic-diagram-of-the-P-Pdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![The equivalent view of P&P\documentclass[12pt]{minimal}...](publication/354870279/figure/fig2/AS:11431281118360504@1675740601922/The-equivalent-view-of-P-Pdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![The key rates of the P&P\documentclass[12pt]{minimal}...](publication/354870279/figure/fig3/AS:11431281118309511@1675740601950/The-key-rates-of-the-P-Pdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![The key rates of the P&P\documentclass[12pt]{minimal}...](publication/354870279/figure/fig4/AS:11431281118337859@1675740601987/The-key-rates-of-the-P-Pdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
Twin-field quantum key distribution (TF-QKD) is a new extraordinary QKD protocol, which can overcome the fundamental rate-distance limit without quantum repeaters. Moreover, its variant, the sending-or-not-sending twin-field quantum key distribution (SNS-QKD) protocol, can both tolerate large misalignment error and have a higher key rate; however,...
In this paper, we present edge detection schemes with specially designed superposed spiral phase plate (SSPP) filters in the Fourier domain both for intensity or phase objects. A special SSPP whose function is equivalent to Sobel operator in space domain is firstly designed by weighting different topological charge spiral phase plate (SPP) filters....
Privacy amplification is an indispensable step in the post-processing of quantum key distribution, which can be used to compress the redundancy of shared key and improve the security level of the key. The commonly used privacy amplification is based on the random selection of universal hash functions, which needs the help of an additional random so...
We introduce the model of a multi-Gaussian correlated Hankel–Bessel (MGCHB) beam generated by a multi-Gaussian Shell-model source and investigate the properties of the beam in anisotropic oceanic turbulence. Under Rytov approximation, the detection probability of the MGCHB beam and the channel capacity with MGCHB beams are derived; both the influen...
In order to further improve the performance of the phase-matching quantum key distribution (PM-QKD) protocol, in this paper, a more efficient protocol named PPM-PM-QKD is proposed which adopts pulse-position modulation (PPM) to realize the high-dimensional encoding. PPM technology utilizes the empty pulses in the weak coherent source, and can impro...
In the paper, we present the analytical expression of propagation characteristics of the autofocusing Airy beam (AAB) with power-exponent-phase beam carrying orbital angular momentum (OAM) mode (named AAB-PEPV), in weak anisotropic oceanic turbulence. We discuss the influence of the weak oceanic turbulence on the detection probability of the AAB-PE...
Evaluating the amount of information obtained from nonorthogonal quantum states is an important topic in the field of quantum information. The commonly used evaluation method is Holevo bound, which only provides an upper bound for quantum measurement. In this paper, we provide a theoretical study of the positive operator-valued measure (POVM) for t...
The inseparability of quantum correlation requires that the particles in the composite system be treated as a whole rather than treated separately, a typical example is the Einstein–Podolsky–Rosen (EPR) paradox. In this paper, we provide a theoretical study on the uncertainty relations of two kinds of bipartite observables in two-photon orbital ang...
In this paper, we propose a novel full color single pixel imaging by using multiple input single output (MISO) technology. In the scheme, the MISO technology, which is widely used in the wireless communications, is used to simultaneously produce three (red, green and blue) detection signal components corresponding to the red, green and blue compone...
Single-photon entanglement, the entanglement between vacuum state and single-photon state, is essentially the entanglement of particle characteristics. Wave-particle duality indicates that wave property and particle property could coexist. Can we find evidence of wave-behavior entanglement in single-photon entanglement? Here, based on the construct...
In this paper, we use two methods to research the propagation characteristics of a Hypergeometric-Gaussian (HyGG) vortex beam under oceanic turbulence. One is numerical calculation based on the Rytov approximation theory, where the theoretical detection probability equation of the HyGG vortex beam propagating through oceanic turbulence is derived....
In recent years, as the demand for underwater communication has increased, underwater wireless optical communication (UWOC) has attracted a lot of attentions. Meanwhile, orbital angular momentum (OAM) has been applied in UWOC system to increase communication link capacity. However, the aberrations caused by oceanic turbulence (OT) is unavoidable, w...
The phase-matching quantum key distribution (PM-QKD), one of the variants of Twin-Field (TF) QKD protocol, was recently proposed to overcome the rate-distance limits of point to point protocol without quantum repeaters. In this paper, we propose a more practical PM-QKD protocol version with four-intensity decoy states and source errors, since neith...
We propose a multiple-pulse phase-matching quantum key distribution protocol to exceed the linear key rate bound and to achieve higher error tolerance. In our protocol, Alice and Bob generate at first their own pulse train (each train should contain L pulses) as well as random bit sequences and also encode each pulse of their train with a randomize...
In this paper, we propose a novel super-resolution ghost imaging based on Fourier spectrum acquisition. In the scheme, we use a set of sinusoidal speckle patterns with specific phase shift to illuminate the object, and then the corresponding total intensity of reflective light is measured by a bucket detector. By performing the inverse Fourier tran...
![(Color online) Quantum witness Wq\documentclass[12pt]{minimal}...](publication/343173800/figure/fig6/AS:962156849799182@1606407477626/Color-online-Quantum-witness-Wqdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![(Color online) Quantum witness Wq\documentclass[12pt]{minimal}...](publication/343173800/figure/fig7/AS:962156854005761@1606407478072/Color-online-Quantum-witness-Wqdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![(Color online) Quantum witness Wq\documentclass[12pt]{minimal}...](publication/343173800/figure/fig8/AS:962156853989391@1606407478579/Color-online-Quantum-witness-Wqdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
Measurement can reveal the difference between quantum physics and classical one. Recently, a quantum witness \(W_q\) was proposed to characterize quantumness (Li et al. in Sci Rep 2:885, 2012; Kofler and Brukner in Phys Rev A 87:052115, 2013). It is built upon the no-signaling-in-time condition, and there is only one-time intermediate measurement....
In the paper, we first present a quantum multiplier based on quantum Fourier transform (QFT), which is composed by a series of double-controlled phase gates, the control qubits are from the two multipliers, and the controlled qubits are in the ancillary state. By the sequential usage of the double-controlled phase gates, the product could be obtain...
According to Rytov approximation theory, we derive the analytical expression of the detection probability of the autofocusing Airy beam (AAB) with powerexponent-phase carrying orbital angular momentum (OAM) mode, AAB-PEPV. We analyze the influence of oceanic turbulence on the propagation characteristics of the AAB-PEPV. The results show that the AA...
In this paper, we propose an optical encryption scheme based on ghost imaging with fractional Fourier transform (FrFT). In the scheme, some special FrFT speckles with designed fractional orders are generated and used to illuminate an object, even the object is unknown, and the bucket detector without spatial resolution is then adopted to detect the...
We present a ghost handwritten digit recognition method for the unknown handwritten digits based on ghost imaging (GI) with deep neural network, where a few detection signals from the bucket detector, generated by the Cosine Transform speckle, are used as the characteristic information and the input of the designed deep neural network (DNN), and th...
In this paper, we propose a multiple-input single-output ghost imaging scheme, named MISO-GI. In the scheme,
${K}$
spatiotemporal speckle pattern sources (
$multiple input$
) simultaneously generate
${K}$
different spatiotemporal modulated speckle patterns which then are illuminated on an unknown object at the same time. Then, a non-spatial-re...
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
In the paper, we experimentally demonstrate the propagation property of Laguerre-Gaussian (LG) beams carrying fractional orbital angular momentum (FOAM) in an underwater environment. The effects of topological charge (TC), temperature gradient, and salinity on the transmission of the LG-FOAM beam in underwater turbulence are analyzed, and the optim...
Two time-reversal quantum key distribution (QKD) schemes are the quantum entanglement based device-independent (DI)-QKD and measurement-device-independent (MDI)-QKD. The recently proposed twin field (TF)-QKD, also known as phase-matching (PM)-QKD, has improved the key rate bound from O(η) to O(η) with η the channel transmittance. In fact, TF-QKD is...
In this paper, we present an effective way for simulating oceanic turbulence channel on the beam carrying orbital angular momentum (OAM). The influence caused by oceanic turbulence channel on the phase and intensity of the propagation beam is equivalent to that the beam passing through several individual phase screens generated by power spectrum in...
Evaluating the theoretical limit of the amount of information Eve can steal from a quantum key distribution protocol under given conditions is one of the most important things that need to be done in security proof. In addition to source loopholes and detection loopholes, channel attacks are considered to be the main ways of information leakage, wh...
The simplest single-photon entanglement is the entanglement of the vacuum state and the single-photon state between two path modes. The verification of the existence of single-photon entanglement has attracted extensive research interests. Here, based on the construction of Bell's inequality in wave space, we propose a new method to verify single p...
Two time-reversal quantum key distribution (QKD) schemes are the quantum entanglement based device-independent (DI)-QKD and measurement-device-independent (MDI)-QKD. The recently proposed twin field (TF)-QKD, also known as phase-matching (PM)-QKD, has improved the key rate bound from $O\left( \eta \right )$ to $O\left( \sqrt {\eta} \right )$ with $...
We propose a multiple pulses phase-matching quantum key distribution protocol (MPPM-QKD) to exceed the linear key rate bound and to achieve higher error tolerance. In our protocol, Alice and Bob generate at first their own train pulses (each train should contain L pulses) as well as random bit sequences, and also encode each pulse of their trains w...
In this paper, we propose an advanced framework of ghost edge imaging, named compressed ghost edge imaging (CGEI). In the scheme, a set of structured speckle patterns with pixel shifting are illuminated on an unknown object, and the output is collected by a bucket detector without any spatial resolution. By using compressed sensing algorithm, we ob...
In this paper, we report on experimental demonstration of the propagation and self-healing property of Bessel-Gaussian (BG) beam carrying orbital angular momentum (OAM) in an underwater environment. Especially, the effects of topological charge, temperature gradient, and salinity on the transmission and self-reconstruction of BG beam in underwater...
An important problem in the practical application of high-dimensional two-photon orbital angular momentum (OAM) entanglement generated by spontaneous down conversion is a lower degree of entanglement, where the amplitudes of modes are not uniformly distributed. In contrast to the previously raised entanglement concentration protocol, we here report...
In order to improve the noise tolerability of quantum secret sharing, we propose a quantum secret sharing scheme based on a round-robin differential-phase-shift quantum key distribution (RRDPS-QKD) protocol, named RRDPS-QSS scheme. In the presented scheme, Alice prepares two L-bit weak coherent pulses (trains), and encodes two random bit sequences...
This paper presents a new latency reduction method for successive-cancellation (SC) decoding of polar codes that performs a frozen-bit checking on the rate-other (R-other) nodes of the Fast Simplified SC (Fast-SSC) pruning tree. The proposed method integrates the Fast-SSC algorithm and the Improved SSC method (frozen-bit checking of the R-other nod...
Perfect optical vortex (POV) beam is a special kind of vortex beam, whose radius is independent of its topological charge. In this paper, we propose a two-dimensional multiplexing scheme with a ring radius and topological charge of POV beam. A communication system using the proposed multiplexing scheme with a two-step detection method is presented,...
With Rytov approximation theory, we derive the analytic expression of detection probability of Airy vortex beam carrying orbital angular momentum (OAM) through an anisotropic weak oceanic turbulence. We investigate the influences of turbulence parameters and beam parameters on the propagation properties of Airy-OAM beam. The numerical simulation re...
Orbital angular momentum entanglement (OAM) is one of the very intriguing topics in quantum physics. In addition to discovering and exploring its underlying mechanics, recent studies have also demonstrated a progress towards expanding degree of its entanglement. In this paper, we explore OAM entanglement by applying the Heisenberg uncertainty princ...
By virtue of multiple-beam interference, periodic structures such as photonic or phononic crystals can be used to separate an incident polychromatic light or acoustic beams, respectively, into their constituent frequency components. In addition, it is widely acknowledged that a light beam that is carrying orbital angular momentum (OAM) also has a s...
In general, extended states are more sensitive to boundary conditions (BCs) than localized ones. We expand an eigenstate |p〉 of a Hamiltonian with periodic BC as the superposition of all eigenstates a〉 of the same Hamiltonian but with antiperiodic BC, i.e., |p〉 = σNa a=1|a〉 = σNa a=1Ca βa〉, where Cβa = βa|βp〉 and N is the Hilbert space dimension. T...
With Rytov approximation theory, we derive the analytic expression of detection probability of Airy vortex beam carrying orbital angular momentum (OAM) through an anisotropic weak oceanic turbulence. We investigate the influences of turbulence parameters and beam parameters on the propagation properties of Airy-OAM beam. The numerical simulation re...
Improving the secret key rate is one of the vital issues in practical applications of quantum key distribution (QKD). In this paper, we propose an experimental scheme of high-dimensional measurement-device-independent quantum key distribution (MDI-QKD) based on spatial basis aiming to increase the key rate. Two groups of discrete position basis and...
Bell inequality testing, a well-established method to demonstrate quantum non-locality between remote two-partite entangled systems, is playing an important role in the field of quantum information. The extension to high-dimensional entangled systems, using the so-called Bell-CGLMP inequality, points the way in measuring joint probabilities, the ke...
In the paper, we propose a new edge detection schemes, based on a single-pixel imaging in the frequency domain. In SCHEME-I, special sinusoidal patterns for the x-direction edge and also y-direction edge of the unknown object are first designed. The frequency spectrum for the edge is then obtained using the a four-step phase-shifting technique with...
In this paper, we propose an edge detection scheme by using a subpixel-speckle-shifting ghost imaging, named SPSGI. In the scheme, a set of subpixel-shifted Walsh–Hadamard speckle pattern pairs with low resolution are used to illuminate an unknown object. The edges information with high-quality and higher resolution of the object could be obtained...
It is shown that orbital angular momentum (OAM) is a promising new resource in future classical and quantum communications. However, the separation of OAM modes is still a big challenge. In this paper, we propose a simple and efficient separation method with a radial varying phase. In the method, specific radial varying phases are designed and modu...
![Optimal intensity Lμ\documentclass[12pt]{minimal} \usepackage{amsmath}...](publication/314125121/figure/fig3/AS:962154622615570@1606406946831/Optimal-intensity-Lmdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
![Optimal threshold photon number nth\documentclass[12pt]{minimal}...](publication/314125121/figure/fig4/AS:962154622615579@1606406946996/Optimal-threshold-photon-number-nthdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
Round-robin differential-phase-shift (RRDPS) quantum key distribution (QKD) scheme provides an effective way to overcome the signal disturbance from the transmission process. However, most RRDPS-QKD schemes use weak coherent pulses (WCPs) as the replacement of the perfect single-photon source. Considering the heralded pair-coherent source (HPCS) ca...
In this paper, we propose a ghost imaging scheme with fast Walsh–Hadamard transform, named GIFWHT. In the scheme, Walsh–Hadamard pattern pairs are used to illuminate an object to generate pairs of detection results, and the corresponding differential detection result is used as the result as that from the conventional bucket detector. By performing...
We explore a distinguishability D and a visibility V, satisfying the relation D2+V2=1, to measure a single electron's particlelike and wavelike behaviors, respectively. For several typical one-dimensional nonuniform lattice systems, we find that D2 is less than, equal to, and greater than V2 for delocalized, critical, and localized states, respecti...
We explore quantum coherence, inherited from Wigner-Yanase skew information, to analyze
quantum criticality in the anisotropic XY chain model at finite temperature. Based on the
exact solutions of the Hamiltonian, the quantum coherence contained in a nearest-neighbor
spin pairs reduced density matrix ρ is obtained. The first-order derivative of the...
Imaging hiding schemes play important roles in now big data times. They provide copyright protections of digital images. In the paper, we propose a novel image hiding scheme based on computational ghost imaging to have strong robustness and high security. The watermark is encrypted with the configuration of a computational ghost imaging system, and...
Ghost imaging could be used to make a quick identification of orthogonal objects by means of photocurrent correlation measurements. In this paper, we extend the method to identify nonorthogonal objects. In the method, an object is illuminated by one photon from an entangled pair, and the other one is diffracted into a particular direction by a pre-...
We propose a novel quantity to measure the degree of localization properties of various types of one-dimension single electron states. The quantity includes information about the spatial variation of probability density of quantum states. Numerical results show that it can distinguish localized states from delocalized ones, so it can be used as a f...
In this paper, we propose a high performance optical encryption (OE) scheme based on computational ghost imaging (GI) with QR code and compressive sensing (CS) technique, named QR-CGI-OE scheme. N random phase screens, generated by Alice, is a secret key and be shared with its authorized user, Bob. The information is first encoded by Alice with QR...
We propose a complex quantity, , to characterize the degree of disorder of -length binary symbolic sequences. As examples, we respectively apply it to typical random and deterministic sequences. One kind of random sequences is generated from a periodic binary sequence and the other is generated from the logistic map. The deterministic sequences are...
Shannon information entropy (SE), concurrence (CC), quantum discord (QD) and localization
properties for various one-dimensional one-electron wave functions are intensively
studied, respectively. They include Gaussian functions, power-law functions, and functions
in the Anderson model and the Harper ones. For all these wave functions, we find that...
The free-space optical (FSO) communication links with orbital angular
momentum (OAM) multiplexing have been demonstrated that they can largely
enhance the systems' capacity without a corresponding increase in spectral
bandwidth, but the performance of the system is unavoidably disturbed by
atmospheric turbulence (AT). Different from the existed AT...
Citations
... where U l represents an arbitrary unitary operation, and L denotes the parameterization's depth. With the exception of hybrid models incorporating classical layers alongside quantum counterparts [45], the selection of this parameterization distinguishes between various proposed models [46]. The constituent unitaries U l are constructed from a combination of quantum gates, including rotation gates and controlled gates, thereby shaping the transformation applied to the quantum state. ...
... In this case, background scattering of a Gaussian beam at a spatial light modulator (SLM) was used as a coherent reference wave to generate spiral-shaped interference patterns. A similar mathematical approach based on Fourier transform along circles was utilized by other authors [40]. The extraction of radial and azimuthal information on modal oscillations was demonstrated [41]. ...
... In this approach, a pre ORAP is applied to the host image and then object light is multiplied by virtual convergence light that enhances reconstructed hologram quality and reduces speckle noise [30]. Then, computer generated holograms were proposed using various transforms and encryption techniques such as phase only computer generated hologram [31], chaos hologram [32], ghost imaging [33], 3D image encryption [34,35], interference based algorithms [36,37], and wavelength multiplexing and lens less Fresnel holograms [38]. ...
... In 2018, Lucamarini et al. proposed a primitive twin-field quantum key distribution (TF-QKD) 3 protocol based on single photon interference. Inspired by this protocol, the sending-or-not-sending TF-QKD (SNS-TF-QKD) 4 protocol, the phase-matching QKD (PM-QKD) 5,6 protocol, the no-phase-post-selection TF-QKD (NPP-TF-QKD) 7,8 protocol, and other variants of the protocols have been successively proposed and applied to experiments. [9][10][11][12][13][14] The TF-QKD protocol is able to break through the Pirandola-Laurenza-Ottaviani-Banchi (PLOB) bound without trusted relay, 15 which not only has the advantage of long-distance encoding but also has the security of measurement device-independence. ...
... Recently, OAM has been exploited as a new information carrier in holography to greatly improve the capacity, the security of the hologram and the data storage. [18][19][20] The core of the OAM holography is to preserve and select appropriate OAM modes in the reconstruction of holographic images. Therefore, the target image should be sampled by a two-dimensional (2D) Dirac comb array, where the sampling period is determined by the Fourier transform of the OAM mode. ...
... [6][7][8][9][10] Additionally, a DDNN was applied in adaptive optics to quickly extract the characteristics of the distorted intensity caused by oceanic turbulence in time. [11][12][13] However, works about DDNNs for the VVB's classification are less far discussed. ...
... Parameterized quantum circuits (PQCs) offer a useful way to implement quantum algorithms [1][2][3][4][5][6][7][8][9][10] and can demonstrate quantum supremacy in the noisy intermediate scale quantum (NISQ) area. [11][12][13][14][15] PQCs are typically composed of fixed gates, e.g., controlled NOTs, or adjustable gates with phase rotations. ...
... where F denotes the Fourier transform, E represents any component of the electric field and Ẽ in = F {E in } . For example, high-pass filters block low spatial frequencies to eliminate unscattered field components for edge detection 18 , which is fundamental to data compression 19 and machine vision 20,21 . A notable sub-class is that of linear optical transfer functions, i.e. ...
... 破了 PLOB 界。马雄峰等 [8] 将"场"具体化提出相位匹配(Phase Matching， PM)协议，并对其安全性进行严格的证明，是目前较优的 TF 变种协议之一 [9] 。 理论上，针对安全性，马雄峰、Lin 等从不同的方面再次对 PM 协议的安全 性进行了分析 [10,11] ；针对编码方式，赵生妹团队提出了基于轨道角动量和基于 脉冲位置调制两种不同编码方式的 PM 协议 [12,13] ；针对实际应用，Yu 等对自由 空间中 PM 协议的应用进行了研究 [14] ，Cui 等对基于卫星的 PM 协议进行了研究 [15] ，Han 和李文婷分别针对 PM 应用中信源问题进行了研究 [16,17] 。实验上，潘 ...
