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
Strong damping and low-temperature anomalies for the harmonic oscillator.
Fritz Haake,Reinhard Reibold +1 more
Journal ArticleDOI
Decoherence and Decay of Motional Quantum States of a Trapped Atom Coupled to Engineered Reservoirs
Q. A. Turchette,C. J. Myatt,B. E. King,Charles Sackett,David Kielpinski,Wayne M. Itano,Christopher Monroe,David J. Wineland +7 more
TL;DR: In this article, the decoherence and decay of quantum states of a trapped atomic ion's harmonic motion interacting with several types of engineered reservoirs is studied. But the decherence rate of superposition states scales with the square of the size of the state.
Journal ArticleDOI
Atomic quantum non-demolition measurements and squeezing
TL;DR: In this paper, the accuracy of atomic interferometry can be improved by using QND measurements of the atomic populations at the inputs to the interferometer, which can reach the Heisenberg limit δ ~ 1/N.
Journal ArticleDOI
Quantum theory of a free particle interacting with a linearly dissipative environment.
Vincent Hakim,Vinay Ambegaokar +1 more
TL;DR: In this article, the quantum-mechanical motion of a free particle coupled to a linearly dissipative environment is analyzed in the Hamiltonian formalism, where the total Hamiltonian is diagonalized and its eigenstates displayed.
Journal ArticleDOI
On the measurement of a weak classical force coupled to a harmonic oscillator: experimental progress
Mark F. Bocko,Roberto Onofrio +1 more
TL;DR: The concept of quantum nondemolition and back-action evasion measurements originated in the context of measurements on a macroscopic mechanical harmonic oscillator, though these techniques may be useful in other experimental contexts as well.