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A new design of a broadband optical isolator, composed as a sequence of ordinary Faraday rotators and achromatic quarter-wave plates (QWPs), is presented. In particular, we demonstrate that by using four Faraday rotators and six achromatic QWPs, rotated at specific angles, optical isolation better than 15 dB over the range from 700 to 1000 nm can b...
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This paper presents a novel family of modular flat-foldable rigid plate structures composed by assemblies of 4R-linkages. First in the field of foldable plates, the proposed system is characterized by being not only foldable but also transformable: the slope of one module over the other is capable of changing not only magnitude but also sign. This...
Citations
... The various pulse sequences differ in their tolerance of 'pulse length' (or coupling strength) and 'off-resonance' errors and correlations between them, and in the operations for which they are suitable and the properties whose fidelity they protect. All are in principle applicable to the coherent control of any other two-state superposition, and such techniques have been applied to the manipulation of superconducting qubits [15], diamond NV colour-centres [16], trapped ions [3,[17][18][19][20][21], microwave control of neutral atoms [22][23][24][25][26], and even the polarization of light [27]. ...
Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wavefunction is split, transformed and recombined, but suffer from experimental inhomogeneities and uncertainties in the speeds and paths of these operations. Several error-correction techniques have been proposed to isolate the variable of interest. Here we apply composite pulse methods to velocity-sensitive Raman state manipulation in a freely-expanding thermal atom cloud. We compare several established pulse sequences, and follow the state evolution within them. The agreement between measurements and simple predictions shows the underlying coherence of the atom ensemble, and the inversion infidelity in an 80 micro-Kelvin atom cloud is halved. Composite pulse techniques, especially if tailored for atom interferometric applications, should allow greater interferometer areas, larger atomic samples and longer interaction times, and hence improve the sensitivity of quantum technologies from inertial sensing and clocks to quantum information processors and tests of fundamental physics.
... Composite pulses are widely used in nuclear magnetic resonance [20, 21], quantum optics and quantum information22232425. An analogue of them—composite wave plates—is used successfully in polarization optics2627282930. Here we demonstrate that highly efficient and broadband frequency generation can be achieved by using composite nonlinear crystals constructed in a similar fashion as composite pulses and composite wave plates. ...
By using ideas from the technique of composite pulses in quantum physics we propose a highly efficient and broadband technique for sum and difference frequency generation with composite nonlinear crystals. The proposed technique works both with continuous-wave and pulsed lasers, as well as in the linear and nonlinear regimes of depleted and undepleted pumps, respectively. The feasibility of the technique is supported by numerical simulations for a composite Potassium Titanium Oxide Phosphate crystal.
We unveil a previously overlooked wave propagation regime in magnetized plasmonic (gyrotropic) materials with comparable plasma and cyclotron frequencies, which enables a giant and broadband (nondispersive) nonreciprocal response. We show that this effect is due to a natural form of dispersion compensation that ultimately originates from the subtle implications of the principle of causality for gyrotropic plasmonic media, which allows the existence of a low-loss frequency window with anomalous nonmonotonic dispersion for the extraordinary mode. This is in stark contrast with conventional nongyrotropic passive materials, for which the frequency derivative of the permittivity dispersion function is always positive in low-loss regions. These findings may pave the way for superior nonreciprocal components in terms of bandwidth of operation and compactness, with orders-of-magnitude reductions in size. As a relevant example, we consider indium antimonide (InSb) to theoretically demonstrate a deeply subwavelength, broadband, THz isolator operating under moderate magnetic bias and at room temperature.
By using ideas from the technique of composite pulses in quantum physics we propose a highly efficient and broadband technique for sum and difference frequency generation with composite nonlinear crystals. The proposed technique works both with continuous-wave and pulsed lasers, as well as in the linear and nonlinear regimes of depleted and undepleted pumps, respectively. The feasibility of the technique is supported by numerical simulations for a composite Potassium Titanium Oxide Phosphate crystal.
