Journal ArticleDOI
Dynamics of decoherence without dissipation in a squeezed thermal bath
TLDR
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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Journal ArticleDOI
Tomograms for open quantum systems: In(finite) dimensional optical and spin systems
TL;DR: In this article, the evolution of tomograms for different quantum systems, both finite and infinite dimensional, is studied, and the effects of decoherence and dissipation are dealt with consistently, using the formalism of open quantum systems.
Journal ArticleDOI
Probing nonclassicality in an optically driven cavity with two atomic ensembles
TL;DR: In this paper, the authors investigated the possibility of observing nonclassical features in a physical system comprised of a cavity with two ensembles of two-level atoms by considering different configurations of the enassembles with respect to the node and antinode of the cavity field under the framework of open quantum systems.
Journal ArticleDOI
Entropy dynamics of a dephasing model in a squeezed thermal bath
TL;DR: In this paper, the authors studied the entropy dynamics of a dephasing model, where a two-level system (TLS) is coupled with a squeezed thermal bath via a nondemolition interaction.
Journal ArticleDOI
Quantum Fisher and skew information for Unruh accelerated Dirac qubit
TL;DR: In this paper, a Bloch vector representation of the Unruh channel for Dirac field mode was developed and the time evolution of Fisher and skew information along with the impact of external environment parameters such as temperature and squeezing.
Journal ArticleDOI
Tomograms for open quantum systems: in(finite) dimensional optical and spin systems
TL;DR: In this paper, the evolution of tomograms for different quantum systems, both finite and infinite dimensional, is studied, using the formalism of open quantum systems and considering the effects of decoherence and dissipation.
References
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Book
Quantum Computation and Quantum Information
TL;DR: In this article, the quantum Fourier transform and its application in quantum information theory is discussed, and distance measures for quantum information are defined. And quantum error-correction and entropy and information are discussed.
Book
The Theory of Open Quantum Systems
TL;DR: Probability in classical and quantum physics has been studied in this article, where classical probability theory and stochastic processes have been applied to quantum optical systems and non-Markovian dynamics in physical systems.
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Coherence in Spontaneous Radiation Processes
TL;DR: In this article, the authors considered a radiating gas as a single quantum-mechanical system, and the energy levels corresponding to certain correlations between individual molecules were described, where spontaneous emission of radiation in a transition between two such levels leads to the emission of coherent radiation.
Journal ArticleDOI
The Theory of a general quantum system interacting with a linear dissipative system
TL;DR: In this paper, a formalism has been developed, using Feynman's space-time formulation of nonrelativistic quantum mechanics whereby the behavior of a system of interest, which is coupled to other external quantum systems, may be calculated in terms of its own variables only.