Coherence protection in coupled quantum systems

Helen Mary Cammack; Peter George Kirton; Thomas Stace; Paul Eastham; Jonathan Mark James Keeling; Brendon William Lovett

doi:10.1103/PhysRevA.97.022103

Coherence protection in coupled quantum systems

Helen Mary Cammack, Peter George Kirton, Thomas Stace, Paul Eastham, Jonathan Mark James Keeling, Brendon William Lovett

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

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, Atomic, molecular, and optical physics
Volume	97
Issue number	2
Early online date	2 Feb 2018
DOIs	https://doi.org/10.1103/PhysRevA.97.022103
Publication status	Published - Feb 2018

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10.1103/PhysRevA.97.022103

PhysRevA.97.022103
Copyright © 2018, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1103/PhysRevA.97.022103
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Hybrid Polaritonics: Hybrid Polaritonics
Samuel, I. D. W. (PI), Höfling, S. (CoI), Keeling, J. M. J. (CoI) & Turnbull, G. (CoI)
EPSRC
1/09/15 → 31/08/20
Project: Standard
Understand Bose-Einstein Conden of Light: Understanding Bose-Einstein condensation of Light
Kirton, P. G. (PI)
EPSRC
1/01/15 → 31/12/17
Project: Fellowship
Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Supporting data for "Coherence protection in coupled quantum systems"
Cammack, H. M. (Creator), Lovett, B. W. (Creator), Keeling, J. M. J. (Creator), Kirton, P. G. (Creator), Stace, T. (Creator) & Eastham, P. (Creator), University of St Andrews, 2 Feb 2018
DOI: 10.17630/26f46183-943f-48bc-a546-783417d78261
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Cite this

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title = "Coherence protection in coupled quantum systems",

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.",

author = "Cammack, {Helen Mary} and Kirton, {Peter George} and Thomas Stace and Paul Eastham and Keeling, {Jonathan Mark James} and Lovett, {Brendon William}",

note = "HMC acknowledges studentship funding from EPSRC under grant no. EP/G03673X/1. PGK acknowledges support from EPSRC (EP/M010910/1). BWL acknowledges support from EPSRC (EP/K025562/1). PRE acknowledges funding from SFI (15/IACA/3402). JK acknowledges financial support from EPSRC programs “TOPNES” (EP/I031014/1) and “Hybrid-Polaritonics” (EP/M025330/1).",

year = "2018",

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doi = "10.1103/PhysRevA.97.022103",

language = "English",

volume = "97",

journal = "Physical Review. A, Atomic, molecular, and optical physics",

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T1 - Coherence protection in coupled quantum systems

AU - Cammack, Helen Mary

AU - Kirton, Peter George

AU - Stace, Thomas

AU - Eastham, Paul

AU - Keeling, Jonathan Mark James

AU - Lovett, Brendon William

N1 - HMC acknowledges studentship funding from EPSRC under grant no. EP/G03673X/1. PGK acknowledges support from EPSRC (EP/M010910/1). BWL acknowledges support from EPSRC (EP/K025562/1). PRE acknowledges funding from SFI (15/IACA/3402). JK acknowledges financial support from EPSRC programs “TOPNES” (EP/I031014/1) and “Hybrid-Polaritonics” (EP/M025330/1).

PY - 2018/2

Y1 - 2018/2

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevA.97.022103

M3 - Article

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JO - Physical Review. A, Atomic, molecular, and optical physics

JF - Physical Review. A, Atomic, molecular, and optical physics

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Coherence protection in coupled quantum systems

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Projects

Hybrid Polaritonics: Hybrid Polaritonics

Understand Bose-Einstein Conden of Light: Understanding Bose-Einstein condensation of Light

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Supporting data for "Coherence protection in coupled quantum systems"

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