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Quantum sensing of weak radio-frequency signals by pulsed Mollow absorption spectroscopy

Author

Listed:
  • T. Joas

    (Technische Universität München)

  • A. M. Waeber

    (Technische Universität München)

  • G. Braunbeck

    (Technische Universität München)

  • F. Reinhard

    (Technische Universität München)

Abstract

Quantum sensors—qubits sensitive to external fields—have become powerful detectors for various small acoustic and electromagnetic fields. A major key to their success have been dynamical decoupling protocols which enhance sensitivity to weak oscillating (AC) signals. Currently, those methods are limited to signal frequencies below a few MHz. Here we harness a quantum-optical effect, the Mollow triplet splitting of a strongly driven two-level system, to overcome this limitation. We microscopically understand this effect as a pulsed dynamical decoupling protocol and find that it enables sensitive detection of fields close to the driven transition. Employing a nitrogen-vacancy center, we detect GHz microwave fields with a signal strength (Rabi frequency) below the current detection limit, which is set by the center’s spectral linewidth $$1{\rm{/}}T_2^*$$ 1 ∕ T 2 * . Pushing detection sensitivity to the much lower 1/T 2 limit, this scheme could enable various applications, most prominently coherent coupling to single phonons and microwave photons.

Suggested Citation

  • T. Joas & A. M. Waeber & G. Braunbeck & F. Reinhard, 2017. "Quantum sensing of weak radio-frequency signals by pulsed Mollow absorption spectroscopy," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01158-3
    DOI: 10.1038/s41467-017-01158-3
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    Cited by:

    1. Joris J. Carmiggelt & Iacopo Bertelli & Roland W. Mulder & Annick Teepe & Mehrdad Elyasi & Brecht G. Simon & Gerrit E. W. Bauer & Yaroslav M. Blanter & Toeno Sar, 2023. "Broadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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