scholarly journals Decay Process of Quantum Open System at Finite Temperatures

2012 ◽  
Vol 58 (2) ◽  
pp. 251-254 ◽  
Author(s):  
Xiao Xiao ◽  
Yi-Bo Gao
Keyword(s):  
Open System ◽  
Decay Process ◽  
Quantum Open System

Quantum feedback control for qubit-qutrit entanglement

2016 ◽  
Vol 16 (7&8) ◽  
pp. 597-614
Author(s):  
Tiantian Ma ◽  
Jun Jing ◽  
Yi Guo ◽  
Ting Yu
Keyword(s):  
Feedback Control ◽  
Open System ◽  
Control Mechanism ◽  
Initial State ◽  
Level Atom ◽  
Control Scheme ◽  
Quantum Feedback ◽  
Local Feedback ◽  
Quantum Open System ◽  
Different Parts

We study a hybrid quantum open system consisting of two interacting subsystems formed by one two-level atom (qubit) and one three-level atom (qutrit). The quantum open system is coupled to an external environment (cavity) via the qubit-cavity interaction. It is found that the feedback control on different parts of the system (qubit or qutrit) gives dramatically different asymptotical behaviors of the open system dynamics. We show that the local feedback control mechanism acting on the qutrit subsystem is superior than that on the qubit in the sense of improving the entanglement. Particularly, the qutrit-control scheme may result in an entangled steady state, depending on the initial state.

Adiabatic speedup in a non-Markovian quantum open system

2018 ◽  
Vol 98 (6) ◽  
Author(s):  
Zhao-Ming Wang ◽  
Da-Wei Luo ◽  
Mark S. Byrd ◽  
Lian-Ao Wu ◽  
Ting Yu ◽  
...  
Keyword(s):  
Open System ◽  
Quantum Open System

scholarly journals UNCERTAINTY RELATION FOR A QUANTUM OPEN SYSTEM

1995 ◽  
Vol 10 (31) ◽  
pp. 4537-4561 ◽  
Author(s):  
B.L. HU ◽  
YUHONG ZHANG
Keyword(s):  
Open System ◽  
Uncertainty Relation ◽  
Brownian Particle ◽  
Thermal Fluctuations ◽  
Generalized Uncertainty Relation ◽  
Decoherence Time ◽  
Statistical State ◽  
Classical Transition ◽  
Quantum Statistical ◽  
Quantum Open System

We derive the uncertainty relation for a quantum open system consisting of a Brownian particle interacting with a bath of quantum oscillators at finite temperature. We examine how the quantum and thermal fluctuations of the environment contribute to the uncertainty in the canonical variables of the system. We show that upon contact with the bath (assumed to be ohmic in this paper) the system evolves from a quantum-dominated state to a thermal-dominated state in a time which is the same as the decoherence time in similar models in the discussion of quantum to classical transition. This offers some insight into the physical mechanisms involved in the environment-induced decoherence process. We obtain closed analytic expressions for this generalized uncertainty relation under the conditions of high temperature and weak damping, separately. We also consider under these conditions an arbitrarily squeezed initial state and show how the squeeze parameter enters in the generalized uncertainty relation. Using these results we examine the transition of the system from a quantum pure state to a nonequilibrium quantum statistical state and to an equilibrium quantum statistical state. The three stages are marked by the decoherence time and the relaxation time, respectively. With these observations we explicate the physical conditions under which the two basic postulates of quantum statistical mechanics become valid. We also comment on the inappropriate usage of the word “classicality” in many decoherence studies of quantum to classical transition.

scholarly journals Minisuperspace as a Quantum Open System

1993 ◽  
pp. 145-165 ◽  
Author(s):  
B. L. Hu ◽  
J. P. Paz ◽  
S. Sinha
Keyword(s):  
Open System ◽  
Quantum Open System

scholarly journals Revisiting the Quantum Open System Dynamics of Central Spin Model

Quanta ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 55-64
Author(s):  
Samyadeb Bhattacharya ◽  
Subhashish Banerjee
Keyword(s):  
System Dynamics ◽  
Master Equation ◽  
Open System ◽  
Open Quantum Systems ◽  
Quantum Systems ◽  
Spin Model ◽  
Open Quantum ◽  
Spin Bath ◽  
Quantum Open System ◽  
Kraus Operators

In this work, we revisit the theory of open quantum systems from the perspective of fermionic baths. Specifically, we concentrate on the dynamics of a central spin half particle interacting with a spin bath. We have calculated the exact reduced dynamics of the central spin and constructed the Kraus operators in relation to that. Further, the exact Lindblad type canonical master equation corresponding to the reduced dynamics is constructed. We have also briefly touched upon the aspect of non-Markovianity from the backdrop of the reduced dynamics of the central spin.Quanta 2021; 10: 55–64.

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