Coherence protection in coupled quantum systems
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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.
Cammack , H M , Kirton , P G , Stace , T , Eastham , P , Keeling , J M J & Lovett , B W 2018 , ' Coherence protection in coupled quantum systems ' Physical Review. A, Atomic, molecular, and optical physics , vol 97 , no. 2 , 022103 . DOI: 10.1103/PhysRevA.97.022103
Physical Review. A, Atomic, molecular, and optical physics
© 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
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).
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