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Squeezed light from an oscillator measured at the rate of oscillation

Author

Listed:
  • Christian Bærentsen

    (University of Copenhagen)

  • Sergey A. Fedorov

    (University of Copenhagen)

  • Christoffer Østfeldt

    (University of Copenhagen)

  • Mikhail V. Balabas

    (University of Copenhagen)

  • Emil Zeuthen

    (University of Copenhagen)

  • Eugene S. Polzik

    (University of Copenhagen)

Abstract

Sufficiently fast continuous measurements of the position of an oscillator approach measurements projective on position eigenstates. We evidence the transition into the projective regime for a spin oscillator within an ensemble of 2 × 1010 room-temperature atoms by observing correlations between the quadratures of the meter light field. These correlations squeeze the fluctuations of one light quadrature below the vacuum level. When the measurement is slower than the oscillation, we generate $$11.{5}_{-1.5}^{+2.5}\,{{{{{{{\rm{dB}}}}}}}}$$ 11 . 5 − 1.5 + 2.5 dB and detect $$8.{5}_{-0.1}^{+0.1}\,{{{{{{{\rm{dB}}}}}}}}$$ 8 . 5 − 0.1 + 0.1 dB of squeezing in a tunable band that is a fraction of the resonance frequency. When the measurement is as fast as the oscillation, we detect 4.7 dB of squeezing that spans more than one decade of frequencies below the resonance. Our results demonstrate a new regime of continuous quantum measurements on material oscillators, and set a new benchmark for the performance of a linear quantum sensor.

Suggested Citation

  • Christian Bærentsen & Sergey A. Fedorov & Christoffer Østfeldt & Mikhail V. Balabas & Emil Zeuthen & Eugene S. Polzik, 2024. "Squeezed light from an oscillator measured at the rate of oscillation," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47906-0
    DOI: 10.1038/s41467-024-47906-0
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    References listed on IDEAS

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