Coherence protection in coupled quantum systems

H. M. Cammack; P. Kirton; T. M. Stace; P. R. Eastham; J. Keeling; B. W. Lovett

doi:10.1103/PhysRevA.97.022103

Coherence protection in coupled quantum systems

H. M. Cammack, P. Kirton, T. M. Stace, P. R. Eastham, J. Keeling, B. W. Lovett

Physics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

9 Downloads (Pure)

Abstract

The interaction of a quantum system with its environment causes decoherence, setting a fundamental limit on its suitability for quantum information processing. However, we show that if the system consists of coupled parts with different internal energy scales then the interaction of one part with a thermal bath need not lead to loss of coherence from the other. Remarkably, we find that the protected part can remain coherent for longer when the coupling to the bath becomes stronger or the temperature is raised. Our theory will enable the design of decoherence-resistant hybrid quantum computers.

Original language	English
Article number	022103
Number of pages	7
Journal	Physical Review A
Volume	97
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevA.97.022103
Publication status	Published - 2 Feb 2018

Funding

H.M.C. acknowledges studentship funding from the Engineering and Physical Sciences Research Council (EPSRC) under Grant No. EP/G03673X/1. P.G.K. acknowledges support from EPSRC under Grant No. EP/M010910/1.

Keywords

internal energy scales
thermal bath
quantum computers
decoherence-resistant

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10.1103/PhysRevA.97.022103

Cammack-etal-PRA-2018-Coherence-protection-in-coupled-quantum-systemsFinal published version, 486 KB

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AU - Lovett, B. W.

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Coherence protection in coupled quantum systems

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