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Proposal for a continuous wave laser with linewidth well below the standard quantum limit

Author

Listed:
  • Chenxu Liu

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh
    Virginia Tech)

  • Maria Mucci

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh)

  • Xi Cao

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh)

  • M. V. Gurudev Dutt

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh)

  • Michael Hatridge

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh)

  • David Pekker

    (University of Pittsburgh
    Pittsburgh Quantum Institute, University of Pittsburgh)

Abstract

Due to their high coherence, lasers are ubiquitous tools in science. We show that by engineering the coupling between the gain medium and the laser cavity as well as the laser cavity and the output port, it is possible to eliminate most of the noise due to photons entering as well as leaving the laser cavity. Hence, it is possible to reduce the laser linewidth by a factor equal to the number of photons in the laser cavity below the standard quantum limit. We design and theoretically analyze a superconducting circuit that uses Josephson junctions, capacitors and inductors to implement a microwave laser, including the low-noise couplers that allow the design to surpass the standard quantum limit. Our proposal relies on the elements of superconducting quantum information, and thus is an example of how quantum engineering techniques can inspire us to re-imagine the limits of conventional quantum systems.

Suggested Citation

  • Chenxu Liu & Maria Mucci & Xi Cao & M. V. Gurudev Dutt & Michael Hatridge & David Pekker, 2021. "Proposal for a continuous wave laser with linewidth well below the standard quantum limit," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25879-8
    DOI: 10.1038/s41467-021-25879-8
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    Cited by:

    1. Hudson A. Loughlin & Vivishek Sudhir, 2023. "Quantum noise and its evasion in feedback oscillators," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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