Cavity-based architecture to preserve quantum coherence and entanglement

Scientific Reports
Zhong-Xiao ManR Lo Franco

Abstract

Quantum technology relies on the utilization of resources, like quantum coherence and entanglement, which allow quantum information and computation processing. This achievement is however jeopardized by the detrimental effects of the environment surrounding any quantum system, so that finding strategies to protect quantum resources is essential. Non-Markovian and structured environments are useful tools to this aim. Here we show how a simple environmental architecture made of two coupled lossy cavities enables a switch between Markovian and non-Markovian regimes for the dynamics of a qubit embedded in one of the cavity. Furthermore, qubit coherence can be indefinitely preserved if the cavity without qubit is perfect. We then focus on entanglement control of two independent qubits locally subject to such an engineered environment and discuss its feasibility in the framework of circuit quantum electrodynamics. With up-to-date experimental parameters, we show that our architecture allows entanglement lifetimes orders of magnitude longer than the spontaneous lifetime without local cavity couplings. This cavity-based architecture is straightforwardly extendable to many qubits for scalability.

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Citations

Dec 5, 2017·Nature Communications·Sebabrata MukherjeeNatalia Korolkova
Feb 6, 2018·Physical Review Letters·D TamascelliM B Plenio
Feb 23, 2019·Scientific Reports·Chandrashekar RadhakrishnanMd Manirul Ali
Mar 1, 2019·Scientific Reports·Sagnik ChakrabortySibasish Ghosh
Oct 27, 2017·Scientific Reports·Chandrashekar RadhakrishnanTim Byrnes
Sep 27, 2018·Scientific Reports·Ali Mortezapour, Rosario Lo Franco
Apr 22, 2020·Scientific Reports·Kun Wang, Zhu-Jun Zheng
Jan 13, 2019·Entropy·Xin-Wen WangJi-Bing Yuan
Dec 9, 2020·Entropy·Shijiao WangMu-Tian Cheng

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