Xuanhua Wang

Chinese Academy of Sciences | CAS

It has been suggested that quantum complexity is dual to the volume of the extremal surface, the action of the Wheeler-DeWitt patch, and the spacetime volume of the patch. Recently, it is proposed that a generalized volume-complexity observable can be formulated as an equivalently good candidate for the dual holographic complexity. This proposal is...

Recently, a non-isometric holographic model of the black hole interior \cite{Akers:2022qdl} was proposed as a potential solution to the long-standing black hole information puzzle. This model provides two descriptions of the black hole dynamics: the effective field description and the fundamental description of the quantum gravity. The key aspect o...

Recent discovery of the fine-grained entropy formula in gravity succeeded in reconstructing the Page curves that are compatible with unitary evolution. The formula of generalized entropy derived from the gravitational path integration, nevertheless, does not provide a concrete insight on how information comes out from a black hole. In this paper, w...

Fröhlich condensation is a room-temperature nonequilibrium phenomenon which is expected to occur in many physical and biological systems. Although predicted theoretically a half century ago, the nature of such condensation remains elusive. In this Letter, we derive a full quantum theory of Fröhlich condensation from the Wu-Austin Hamiltonian and pr...

Fr\"olich condensate is a room-temperature nonequilibrium phenomenon which is expected to occur in many physical and biological systems. Though predicted theoretically nearly a half century ago, the nature of the condensation process still remains elusive. This has led to divided opinions. In this Letter, we analyze the Fr\"ohlich condensation near...

We study quantum conditional entropy production, which quantifies the irreversibility of system-environment evolution from the perspective of a third system, called the reference. The reference is initially correlated with the system. We show that quantum unconditional entropy production with respect to the system is less than conditional entropy p...

In this study, we apply quantum master equations beyond secular approximation and investigate the nonequilibrium thermodynamic cost of enhanced quantum metrology and quantum correlations. We find that the nonequilibrium conditions enhance quantum Fisher information (QFI) and quantum correlations predominantly for weak tunneling scenarios. The enhan...

By using the quantum extremal island formula, we perform a simple calculation of the generalized entanglement entropy of Hawking radiation from the two-dimensional Liouville black hole. No reasonable island was found when extremizing the generalized entropy. We explain qualitatively the reason why the page curve cannot be reproduced in the present...

We study the quantum conditional entropy production, which quantifies the irreversibly conditioned on the coupling memory of the system. We prove that the quantum unconditional entropy production is less than the conditional one, where the latter has contribution from the informational nonequilibrium. The mismatch, defined as the quantum dissipativ...

Fluctuations associated with relaxations in the far-from-equilibrium regime is of fundamental interest for a large variety of systems within broad scales. Recent advances in techniques such as spectroscopy have generated the possibility for measuring the fluctuations of the mesoscopic systems in connection to the relaxation processes when driving t...

Recent progress on the black hole information paradox has succeeded in reconstructing Page curves compatible with unitary evolution. The formula of generalized entropy derived from the gravitational path integration, nevertheless, does not provide concrete insight on how the information comes out from the black hole given that the state of the radi...

We study the entanglement entropy of a one-parameter family of exactly solvable gravities in the two-dimensional asymptotically flat space. The islands and Page curves of eternal, evaporating, and bath-removed black holes are investigated. The different theories in this parameter class are identified through field redefinitions, which leave the isl...

By using the quantum extremal island formula, we perform a simple calculation of the generalized entanglement entropy of Hawking radiation from the two dimensional Liouville black hole. No reasonable island was found when extremizing the generalized entropy. This suggests that the islands may not necessarily save the information paradox for the Lio...

A bstract We apply the recently proposed quantum extremal surface construction to calculate the Page curve of the eternal Reissner-Nordström black holes in four dimensions ignoring the backreaction and the greybody factor. Without the island, the entropy of Hawking radiation grows linearly with time, which results in the information paradox for the...

Analyses suggest the the quantum RT construction can be effectively extended to the asymptotically flat spacetime such as RST gravity for the calculation of the entanglement entropy. We study the entanglement entropy of a parameter family of asymptotically flat 2-dimensional evaporating and bath-removed black holes which include RST black holes and...

Fluctuations associated with relaxations in far-from-equilibrium regime is of fundamental interest for a large variety of systems within broad scales. Recent advances in techniques such as spectroscopy have generated the possibility for measuring the fluctuations of the mesoscopic systems in connection to the relaxation processes when driving the u...

Strong molecule-light interaction enables the control of molecular structures and dynamical processes. A model with a strong laser drive is proposed to greatly enhance the intermolecular distance of resonant energy transfer, where the molecules are strongly driven by an optical cavity. The optimal Rabi frequency and quantum yield of energy transfer...

We apply the recently proposed quantum extremal island formula to calculate the Page curve of the eternal Reissner-Nordstr\"om black holes in four dimensions. Without the island, the entropy of Hawking radiation grows linearly with time, which results in the information paradox for the eternal black holes. By extremizing the generalized entropy tha...

Strong molecule-light interaction enables the control of molecular structures and dynamical processes. A molecular model is proposed to greatly enhance the intermolecular distance of resonant energy transfer, where the molecules are strongly driven by an optical cavity. The optimal intermolecular distance and quantum yield of energy transfer are ob...

Quantum enhanced measurement termed as quantum metrology is important for quantum information science and technology. A crucial measure for the minimum achievable statistical uncertainty in the estimation of the parameters is given by the quantum Fisher information (QFI). Although QFI of closed systems has been investigated, how the nonequilibrium...

We study the steady-state entanglement and correlations of an open system comprising two coupled fermions in the equilibrium or nonequilibrium environments and distill the nonequilibrium contribution to the quantum correlations. We show that in the equilibrium condition, the steady-state quantum correlations exhibit nonmonotonic behavior, while in...

We study the steady state entanglement and correlations of an open system comprised of two fermions coupling with the equilibrium or nonequilibrium environments. We find that for equilibrium case, quantum correlations exhibit non-monotonic behavior with the increase of temperature and quantum entanglement dies at finite temperature. Under nonequili...