Quantum metrology with finite-energy GKP states

ORAL

Abstract

Finite-energy GKP states have been shown to be sensitive single-mode displacements sensors [1]. Moreover, quantum error correction has been proposed as a tool to enhanced the accuracy of metrology protocols [2]. Here, we explore the connection between these concepts and study the use of stabilized quantum error corrected finite-energy GKP states as quantum sensors. We analyze their use as single-mode displacement sensors, and provide protocols to improve the measurement sensitivity achievable with uncorrected finite-energy GKP states. Going beyond the single-mode scenario, we explore multi-mode GKP sensitivity improvements over their single-mode counterparts. Finally, we explore potential applications.

[1] Duivenvoorden, K., Terhal, B. M., & Weigand, D. Phys. Rev. A 95, 012305 (2017).

[2] Kessler, E. M., Lovchinsky, I., Sushkov, A. O., & Lukin, M. D. Phys. Rev. Lett. 112, 150802 (2014).

* Work covered in this talk was undertaken thanks in part to funding from NSERC, the Canada First Research Excellence Fund, the Ministère de l'Économie et de l'Innovation du Québec, and the Fonds de recherche du Québec Nature et Technologies. Support is also acknowledged from the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Systems Accelerator.

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Presenters

  • Lautaro Labarca

    Université de Sherbrooke

Authors

  • Lautaro Labarca

    Université de Sherbrooke

  • Baptiste Royer

    Université de Sherbrooke

  • Alexandre Blais

    Universite de Sherbrooke