Squeezed light from an oscillator measured at the rate of oscillation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38755123.
- Also identified by DOI 10.1038/s41467-024-47906-0 and PMC identifier 11099115.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 × 10<sup>10</sup> 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 <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>11</mn> <mo>.</mo> <msubsup><mrow><mn>5</mn></mrow> <mrow><mo>-</mo> <mn>1.5</mn></mrow> <mrow><mo>+</mo> <mn>2.5</mn></mrow> </msubsup> <mspace></mspace> <mi>dB</mi></math> and detect <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>8</mn> <mo>.</mo> <msubsup><mrow><mn>5</mn></mrow> <mrow><mo>-</mo> <mn>0.1</mn></mrow> <mrow><mo>+</mo> <mn>0.1</mn></mrow> </msubsup> <mspace></mspace> <mi>dB</mi></math> 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.