Quantum Spectroscopy with Squeezed Light

Interferometric Measurement With Squeezed Light

10.21236/ada276234 ◽

1994 ◽

Author(s):

H. A. Haus

Keyword(s):

Squeezed Light ◽

Interferometric Measurement

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Interferometric Measurement with Squeezed Light.

10.21236/ada292402 ◽

1995 ◽

Author(s):

Hermann A. Haus ◽

Karen Bergman ◽

Luc Boivin

Keyword(s):

Squeezed Light ◽

Interferometric Measurement

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Bright squeezed-light generation by a continuous-wave semimonolithic parametric amplifier

Optics Letters ◽

10.1364/ol.21.001396 ◽

1996 ◽

Vol 21 (17) ◽

pp. 1396 ◽

Cited By ~ 52

Author(s):

K. Schneider ◽

R. Bruckmeier ◽

H. Hansen ◽

S. Schiller ◽

J. Mlynek

Keyword(s):

Continuous Wave ◽

Parametric Amplifier ◽

Squeezed Light ◽

Light Generation

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Overcoming detection loss and noise in squeezing-based optical sensing

npj Quantum Information ◽

10.1038/s41534-021-00407-0 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Gaetano Frascella ◽

Sascha Agne ◽

Farid Ya. Khalili ◽

Maria V. Chekhova

Keyword(s):

Shot Noise ◽

Optical Sensing ◽

Detection Efficiency ◽

Signal To Noise Ratio ◽

Real Life ◽

Squeezed States ◽

Squeezed Light ◽

Noise Limit ◽

Imaging And Spectroscopy ◽

Shot Noise Limit

AbstractAmong the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in imaging and spectroscopy, and are already used in real-life gravitational-wave detectors. But despite being more robust than other states, they are still very fragile, which narrows the scope of their application. In particular, squeezed states are useless in measurements where the detection is inefficient or the noise is high. Here, we experimentally demonstrate a remedy against loss and noise: strong noiseless amplification before detection. This way, we achieve loss-tolerant operation of an interferometer fed with squeezed and coherent light. With only 50% detection efficiency and with noise exceeding the level of squeezed light more than 50 times, we overcome the shot-noise limit by 6 dB. Sub-shot-noise phase sensitivity survives up to 87% loss. Application of this technique to other types of optical sensing and imaging promises a full use of quantum resources in these fields.

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