Generation of sustained optimal entropy squeezing of a two-level atom via non-Hermitian operation

Wang, Yan-Yi; Mao-Fa, Fang

doi:10.1088/1674-1056/27/11/114207

Cited by 11 publications

(11 citation statements)

References 26 publications

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“…[9][10][11] Moreover, the framework for the NH formalism of Hamiltonians has been proposed by Brody et al [12] and Sergi et al [13] Based on the previous works, many quantum properties and quantum effects in NH systems have been widely studied. [14][15][16][17][18][19][20] These research results show that NH Hamiltonians are useful in theoretical work, and they are also regarded as effective mathematical tools for studying quantum properties of open quantum systems in quantum optics. [21][22][23][24] On the other hand, the quantum speed limit time (QSLT) originates from the Heisenberg uncertainty relation for energy and time, it is conventionally known as the minimum evolutionary time between two distinguishable states of a quantum system, and it becomes a key factor in characterizing the maximum evolutionary speed of quantum systems.…”

Section: Introductionmentioning

confidence: 78%

Quantum speed limit time of a non-Hermitian two-level system

Wang

Mao-Fa

2020

Chinese Phys. B

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We investigated the quantum speed limit time of a qubit system with non-Hermitian detuning. Our results show that, with respect to two distinguishable states of the non-Hermitian system, the evolutionary time does not have a nonzero lower bound. And the quantum evolution of the system can be effectively accelerated by adjusting the non-Hermitian detuning parameter, as well as the quantum speed limit time can be arbitrarily small even be zero.

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Section: Introductionmentioning

confidence: 78%

Quantum speed limit time of a non-Hermitian two-level system

Wang

Mao-Fa

2020

Chinese Phys. B

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“…While Eqs. (39) and (40) are simply a way of rewriting the original flow equations, the next section's formalism is actually a generalization, which ushers in a new physics.…”

Section: Wave-mechanical Analogy In Zonal Flowsmentioning

confidence: 99%

Density Operator Approach to Turbulent Flows in Plasma and Atmospheric Fluids

Zloshchastiev

2020

Universe

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We formulate a statistical wave-mechanical approach to describe dissipation and instabilities in two-dimensional turbulent flows of magnetized plasmas and atmospheric fluids, such as drift and Rossby waves. This is made possible by the existence of Hilbert space, associated with the electric potential of plasma or stream function of atmospheric fluid. We therefore regard such turbulent flows as macroscopic wave-mechanical phenomena, driven by the non-Hermitian Hamiltonian operator we derive, whose anti-Hermitian component is attributed to an effect of the environment. Introducing a wave-mechanical density operator for the statistical ensembles of waves, we formulate master equations and define observables: such as the enstrophy and energy of both the waves and zonal flow as statistical averages. We establish that our open system can generally follow two types of time evolution, depending on whether the environment hinders or assists the system’s stability and integrity. We also consider a phase-space formulation of the theory, including the geometrical-optic limit and beyond, and study the conservation laws of physical observables. It is thus shown that the approach predicts various mechanisms of energy and enstrophy exchange between drift waves and zonal flow, which were hitherto overlooked in models based on wave kinetic equations.

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“…On the one hand, entropy generation is a measurement of the chaos of the system. [22,23] When we give the thermodynamic difference, the minimum entropy generation directly correspond to the minimum rate of heat transfer, that is, the best insulating efficiency. [24] On the other hand, entransy represents the heat transfer potential capacity.…”

Section: Overall Performance Evaluationmentioning

confidence: 99%

Analysis of elliptical thermal cloak based on entropy generation and entransy dissipation approach*

Wang

Huang

et al. 2019

Chinese Phys. B

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In this work, we designed the elliptical thermal cloak based on the transformation thermotics. The local entropy generation rate distribution and entransy dissipation rate distribution were obtained, and the total entropy generation and entransy dissipation of different types of elliptical cloaks were evaluated. We used entropy generation approach and entransy dissipation approach to evaluate the performance of the thermal cloak, and heat dissipation analysis was carried out for models with different parameters. Finally, the optimized elliptical thermal cloak with minimum entropy generation and minimum entransy dissipation is found, and some suggestions on optimizing the structure of elliptical thermal cloak were given.

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Generation of sustained optimal entropy squeezing of a two-level atom via non-Hermitian operation

Cited by 11 publications

References 26 publications

Quantum speed limit time of a non-Hermitian two-level system

Quantum speed limit time of a non-Hermitian two-level system

Density Operator Approach to Turbulent Flows in Plasma and Atmospheric Fluids

Analysis of elliptical thermal cloak based on entropy generation and entransy dissipation approach*

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