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An optical analogue for rotating BTZ black holes
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作者 Ling Chen Hongbin Zhang Baocheng Zhang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2023年第3期84-90,共7页
We demonstrate an optical realization for the rotating BTZ black hole using the recent popular photon fluid model in an optical vortex but with a new proposed expression for the optical phase.We also give the numerica... We demonstrate an optical realization for the rotating BTZ black hole using the recent popular photon fluid model in an optical vortex but with a new proposed expression for the optical phase.We also give the numerical realization for the optical vortex to ensure that it can be generated experimentally.Different from the earlier suggestions for the analogue rotating black holes,our proposal includes an inner horizon in the analogue black hole structure.Such structure can keep for a long distance for the convenience of observing analogue Hawking or Penrose radiations. 展开更多
关键词 BTZ black holes optical vortex inner horizon analogue gravity
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Direct characteristic-function tomography of the quantum states of quantum fields
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作者 Zehua Tian Jiliang Jing Jiangfeng Du 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2023年第11期119-125,共7页
Herein,we propose a novel strategy for implementing a direct readout of the symmetric characteristic function of the quantum states of quantum fields without the involvement of idealized measurements,an aspect that ha... Herein,we propose a novel strategy for implementing a direct readout of the symmetric characteristic function of the quantum states of quantum fields without the involvement of idealized measurements,an aspect that has always been deemed ill-defined in quantum field theory.This proposed scheme relies on the quantum control and measurements of an auxiliary qubit locally coupled to the quantum fields.By mapping the expectation values of both the real and imaginary parts of the field displacement operator to the qubit states,the qubit's readout provides complete information regarding the symmetric characteristic function.We characterize our technique by applying it to the Kubo-Martin-Schwinger(thermal)and squeezed states of a quantum scalar field.In addition,we have discussed general applications of this approach to analogue-gravity systems,such as Bose-Einstein condensates,within the scope of state-of-the-art experimental capabilities.This proposed strategy may serve as an essential in understanding and optimizing the control of quantum fields for relativistic quantum information applications,particularly in exploring the interplay between gravity and quantum,for example,the relation to locality,causality,and information. 展开更多
关键词 characteristic-function tomography quantum fields Ramsey interferometry analogue gravity
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An Analog of Einstein’s General Relativity Emerging from Classical Finite Elasticity Theory:Analytical and Computational Issues
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作者 C.Cherubini S.Filippi 《Communications in Computational Physics》 SCIE 2013年第8期801-818,共18页
The“analogue gravity formalism”,an interdisciplinary theoretical scheme developed in the past for studying several non relativistic classical and quantum systems through effective relativistic curved space-times,is ... The“analogue gravity formalism”,an interdisciplinary theoretical scheme developed in the past for studying several non relativistic classical and quantum systems through effective relativistic curved space-times,is here applied to largely deformable elastic bodies described by the nonlinear theory of solid mechanics.Assuming the simplest nonlinear constitutive relation for the elastic material given by a Kirchhoff-St Venant strain-energy density function,it is possible to write for the perturbations an effective space-time metric if the deformation is purely longitudinal and depends on one spatial coordinate only.Theoretical and numerical studies of the corresponding dynamics are performed in selected cases and physical implications of the results obtained are finally discussed. 展开更多
关键词 Finite elasticity general relativity analogue gravity finite elements method
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