Journal ArticleDOI
Dynamics of decoherence without dissipation in a squeezed thermal bath
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In this article, a generic open quantum system where the coupling between the system and its environment is of an energy-preserving quantum nondemolition (QND) type is studied.Abstract:
We study a generic open quantum system where the coupling between the system and its environment is of an energy-preserving quantum nondemolition (QND) type. We obtain the general master equation for the evolution of such a system under the influence of a squeezed thermal bath of harmonic oscillators. From the master equation it can be seen explicitly that the process involves decoherence or dephasing without any dissipation of energy. We work out the decoherence-causing term in the high- and zero-temperature limits and check that they match with known results for the case of a thermal bath. The decay of the coherence is quantified as well by the dynamics of the linear entropy of the system under various environmental conditions. We make a comparison of the quantum statistical properties between QND and dissipative types of evolution using a two-level atomic system and a harmonic oscillator.read more
Citations
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Controlled bidirectional remote state preparation in noisy environment: a generalized view
TL;DR: It is shown that a realistic controlled bidirectional remote state preparation is possible using a large class of entangled quantum states having a particular structure.
Journal ArticleDOI
A comparative study of protocols for secure quantum communication under noisy environment: single-qubit-based protocols versus entangled-state-based protocols
TL;DR: In this article, the effect of noise on various protocols of secure quantum communication has been studied and two protocols based on single-qubit states and two based on entangled states were compared.
Journal ArticleDOI
Quasiprobability distributions in open quantum systems: Spin-qubit systems
TL;DR: In this paper, the authors provide a comprehensive analysis of quasiprobability distributions for spin-qubit systems under general open system effects, including both pure dephasing as well as dissipation.
Journal ArticleDOI
Dynamics of entanglement in two-qubit open system interacting with a squeezed thermal bath via dissipative interaction
TL;DR: In this article, the dynamics of entanglement in a two-qubit system interacting with a squeezed thermal bath via a dissipative system-reservoir interaction with the system and reservoir assumed to be in a separable initial state was studied by making use of concurrence as well as a recently introduced measure of mixed state entenglement via a probability density function.
Journal ArticleDOI
Dissipative and non-dissipative single-qubit channels: dynamics and geometry
TL;DR: Single-qubit dissipative and non-dissipative channels, set in the general scenario of a system’s interaction with a squeezed thermal bath, are compared in the Choi isomorphism framework, to bring out their contrasting rank and geometric properties.
References
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Journal ArticleDOI
General quantum Brownian motion with initially correlated and nonlinearly coupled environment.
TL;DR: The dynamics of an open quantum system exhibiting the quantum Brownian motion is analyzed when the coupling between the system and its environment is nonlinear, and the systemand the reservoir are initially correlated.
Journal ArticleDOI
Classical phase changes in nonlinear processes and their quantum counterparts.
TL;DR: Quantum-mechanical phase distributions are investigated for some nonlinear optical phenomena which, at a classical level, involve only changes in the phase of the electric field and it is found that, while the peaks of the respective phase distributions exhibit the expected classical behavior, the widths of the phase distributions also undergo substantial changes.
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Photon statistics of superposition states in phase-sensitive reservoirs.
Myung-Woon Kim,Vladimír Bužek +1 more
TL;DR: Using the Wigner function formalism in phase space, it is shown that the decay rate of quantum coherences in phase-sensitive reservoirs can be significantly modified compared to the Decay rate in ordinary (phase-insensitive) thermal reservoirs.
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Decoherence of quantum-nondemolition systems.
Jiushu Shao,Mo-Lin Ge,Hu Cheng +2 more
TL;DR: The density matrices of a generic quantum-nondemolition system coupled to the reservoir of an infinite number of harmonic oscillators and to the reservoirs of an endless number of two-level systems are evaluated exactly and it is found that quantum decoherence is independent of temperature in the latter case.
Journal ArticleDOI
Generalized Feynman-Vernon approach to dissipative quantum systems
TL;DR: The so-called Feynman-Vernon influence functional theory has been generalized in order to include the possibility of dealing with initial conditions of the system plus environment other than the factorizable one.