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Quantum Information Processing
Published in: Quantum Information Processing 6/2016

01-06-2016

Quantum speedup of uncoupled multiqubit open system via dynamical decoupling pulses

Authors: Ya-Ju Song, Le-Man Kuang, Qing-Shou Tan

Published in: Quantum Information Processing | Issue 6/2016

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Abstract

We present a method to accelerate the dynamical evolution of mutltiqubit open system by employing dynamical decoupling pulses (DDPs) when the qubits are initially in W-type states. Here the qubits are independent and coupled to local Lorentzian reservoirs. It is found that this speedup evolution can be achieved in both the weak-coupling regime and the strong-coupling regime. The essential physical mechanism behind the acceleration evolution is explained as a result of the joint action of the non-Markovianity of reservoirs and the excited-state population of qubits. It is shown that both the non-Markovianity and the excited-state population can be controlled by DDPs to realize the quantum speedup.
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Appendix
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Metadata
Title
Quantum speedup of uncoupled multiqubit open system via dynamical decoupling pulses
Authors
Ya-Ju Song
Le-Man Kuang
Qing-Shou Tan
Publication date
01-06-2016
Publisher
Springer US
Published in
Quantum Information Processing / Issue 6/2016
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-016-1291-2

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