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Cloaking a qubit in a cavity

Author

Listed:
  • Cristóbal Lledó

    (Université de Sherbrooke)

  • Rémy Dassonneville

    (Laboratoire de Physique)

  • Adrien Moulinas

    (Université de Sherbrooke)

  • Joachim Cohen

    (Université de Sherbrooke)

  • Ross Shillito

    (Université de Sherbrooke)

  • Audrey Bienfait

    (Laboratoire de Physique)

  • Benjamin Huard

    (Laboratoire de Physique)

  • Alexandre Blais

    (Université de Sherbrooke
    Canadian Institute for Advanced Research)

Abstract

Cavity quantum electrodynamics (QED) uses a cavity to engineer the mode structure of the vacuum electromagnetic field such as to enhance the interaction between light and matter. Exploiting these ideas in solid-state systems has lead to circuit QED which has emerged as a valuable tool to explore the rich physics of quantum optics and as a platform for quantum computation. Here we introduce a simple approach to further engineer the light-matter interaction in a driven cavity by controllably decoupling a qubit from the cavity’s photon population, effectively cloaking the qubit from the cavity. This is realized by driving the qubit with an external tone tailored to destructively interfere with the cavity field, leaving the qubit to interact with a cavity which appears to be in the vacuum state. Our experiment demonstrates how qubit cloaking can be exploited to cancel the ac-Stark shift and measurement-induced dephasing, and to accelerate qubit readout. In addition to qubit readout, applications of this method include qubit logical operations and the preparation of non-classical cavity states in circuit QED and other cavity-based setups.

Suggested Citation

  • Cristóbal Lledó & Rémy Dassonneville & Adrien Moulinas & Joachim Cohen & Ross Shillito & Audrey Bienfait & Benjamin Huard & Alexandre Blais, 2023. "Cloaking a qubit in a cavity," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42060-5
    DOI: 10.1038/s41467-023-42060-5
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    References listed on IDEAS

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