Quantum master equations for entangled qubit environments

Daryanoosh, S, Baragiola, B, Guff, T and Gilchrist, A 2018, 'Quantum master equations for entangled qubit environments', Physical Review A, vol. 98, no. 6, pp. 1-13.


Document type: Journal Article
Collection: Journal Articles

Title Quantum master equations for entangled qubit environments
Author(s) Daryanoosh, S
Baragiola, B
Guff, T
Gilchrist, A
Year 2018
Journal name Physical Review A
Volume number 98
Issue number 6
Start page 1
End page 13
Total pages 13
Publisher American Physical Society
Abstract We study the Markovian dynamics of a collection of n quantum systems coupled to an irreversible environmental channel consisting of a stream of entangled qubits. Within the framework of repeated quantum interactions, we derive the master equation for the joint-state dynamics of the n quantum systems. We investigate the evolution of the joint state for two-qubit environments where the presence of antidiagonal coherences in the state of the bath qubits (in the local energy basis) is essential for preserving and generating entanglement between two remote quantum systems. However, maximally entangled bath qubits, such as Bell states, exhibit exceptional behavior, where the master equation does not have a unique steady state and can destroy entanglement between the systems. For the general case of n-qubit environments we show that antidiagonal coherences that arise from multibody entanglement in the bath qubits do not affect the composite system evolution in the weak-coupling regime.
Subject Quantum Information, Computation and Communication
Quantum Optics
Keyword(s) open quantum systems
master equations
quantum optics
collisional models
DOI - identifier 10.1103/PhysRevA.98.062104
Copyright notice © 2018 American Physical Society
ISSN 2469-9926
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