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
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
Quantum Brownian motion in a general environment: Exact master equation with nonlocal dissipation and colored noise.
TL;DR: The influence functional path-integral method is used to derive an exact master equation for the quantum Brownian motion of a particle linearly coupled to a general environment at arbitrary temperature and applies it to study certain aspects of the loss of quantum coherence.
Journal ArticleDOI
Some properties of coherent spin states
TL;DR: In this article, the properties of spin states analogous to the coherent states of the linear harmonic oscillator are discussed and their properties are used to discuss simple problems (a single spin in a field, a spin wave, two spin 1/2 particles with Heisenberg coupling).
Journal ArticleDOI
Quantum Computers and Dissipation
TL;DR: In this paper, the authors analyse dissipation in quantum computation and its destructive impact on the efficiency of quantum algorithms and show that the quantum factorization algorithm must be modified in order to be regarded as efficient and realistic.
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Phase properties of the quantized single-mode electromagnetic field.
David T. Pegg,Stephen M. Barnett +1 more
TL;DR: This paper investigates the properties of a Hermitian phase operator which follows directly and uniquely from the form of the phase states in this space and finds them to be well behaved.
Journal ArticleDOI
Quantum Nondemolition Measurements
TL;DR: In this paper, the authors describe the new electronic techniques required for quantum nondemolition measurements and the theory underlying them, which may find application elsewhere in science and technology, such as quantum chemistry, quantum optics, or atomic, nuclear, and elementary particle physics.