Squeezed-Light Interferometry on a Cryogenically Cooled Micromechanical Membrane.

Squeezed states of light reduce the signal-normalized photon counting noise of measurements without increasing the light power and enable fundamental research on quantum entanglement in hybrid systems of light and matter. Squeezed states of light have high potential to complement cryogenically cooled sensors, whose thermal noise is suppressed below the quantum noise of light by operation at low temperature. They allow us to reduce the optical heat load on cooled devices by lowering the light power without losing measurement precision. Here, we demonstrate the squeezed-light position sensing of a cryo-cooled micromechanical membrane. The sensing precision is improved by up to 4.8 dB below photon counting noise, limited by optical loss, at a membrane temperature of about 20 K. We prove that realizing a high interference contrast in a cryogenic Michelson interferometer is feasible. Our setup is the first conceptual demonstration towards the envisioned European gravitational-wave detector, the "Einstein telescope," which is planned to use squeezed states of light together with cryo-cooled mirror test masses.

[1]  B. A. Boom,et al.  Quantum Backaction on kg-Scale Mirrors: Observation of Radiation Pressure Noise in the Advanced Virgo Detector. , 2020, Physical review letters.

[2]  M. J. Szczepa'nczyk,et al.  Quantum correlations between the light and kilogram-mass mirrors of LIGO , 2020, 2002.01519.

[3]  M. Fejer,et al.  A cryogenic silicon interferometer for gravitational-wave detection , 2020, Classical and Quantum Gravity.

[4]  A. Schliesser,et al.  Entanglement of propagating optical modes via a mechanical interface , 2019, Nature Communications.

[5]  R. Schnabel.  “Quantum Weirdness” in Exploitation by the International Gravitational‐Wave Observatory Network , 2019, Annalen der Physik.

[6]  Karsten Danzmann,et al.  Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light , 2019 .

[7]  J. R. Palamos,et al.  Quantum-Enhanced Advanced LIGO Detectors in the Era of Gravitational-Wave Astronomy. , 2019, Physical review letters.

[8]  G. Mansell,et al.  Broadband reduction of quantum radiation pressure noise via squeezed light injection , 2018, Nature Photonics.

[9]  Lisa Barsotti,et al.  Squeezed vacuum states of light for gravitational wave detectors , 2018, Reports on progress in physics. Physical Society.

[10]  Roman Schnabel,et al.  13  dB squeezed vacuum states at 1550  nm from 12  mW external pump power at 775  nm. , 2020, Optics letters.

[11]  A. Libson,et al.  Room-temperature optomechanical squeezing , 2018, Nature Physics.

[12]  H. Vahlbruch,et al.  High-efficiency squeezed light generation for gravitational wave detectors , 2018, Classical and Quantum Gravity.

[13]  M. Mantovani,et al.  Vacuum-compatible low-loss Faraday isolator for efficient squeezed-light injection in laser-interferometer-based gravitational-wave detectors. , 2018, Applied optics.

[14]  Varun Prakash,et al.  Quantum-Enhanced Optomechanical Magnetometry , 2018, 2018 Conference on Lasers and Electro-Optics (CLEO).

[15]  Roman Schnabel,et al.  Squeezed states of light and their applications in laser interferometers , 2016, 1611.03986.

[16]  Klemens Hammerer,et al.  Observation of generalized optomechanical coupling and cooling on cavity resonance. , 2014, Physical review letters.

[17]  M. Aspelmeyer,et al.  Squeezed light from a silicon micromechanical resonator , 2013, Nature.

[18]  C. Regal,et al.  Strong Optomechanical Squeezing of Light , 2013, 1306.1268.

[19]  R. Schnabel,et al.  First long-term application of squeezed states of light in a gravitational-wave observatory. , 2013, Physical review letters.

[20]  Thierry Botter,et al.  Non-classical light generated by quantum-noise-driven cavity optomechanics , 2012, Nature.

[21]  C. M. Mow-Lowry,et al.  Balanced homodyne detection of optical quantum states at audio-band frequencies and below , 2012, 1205.3229.

[22]  F. Khalili,et al.  Interferometer readout-noise below the Standard Quantum Limit of a membrane , 2011, 1111.7236.

[23]  David Blair,et al.  A gravitational wave observatory operating beyond the quantum shot-noise limit: Squeezed light in application , 2011, 1109.2295.

[24]  J. K. Blackburn,et al.  A gravitational wave observatory operating beyond the quantum shot-noise limit: Squeezed light in application , 2011, 1109.2295.

[25]  A. Sawadsky,et al.  Laser interferometry with translucent and absorbing mechanical oscillators , 2011, 1104.3251.

[26]  A. Tünnermann,et al.  Waveguide grating mirror in a fully suspended 10 meter Fabry-Perot cavity. , 2011, Optics express.

[27]  N. Mavalvala,et al.  Quantum metrology for gravitational wave astronomy. , 2010, Nature communications.

[28]  Benno Willke,et al.  The third generation of gravitational wave observatories and their science reach , 2010 .

[29]  R. Schnabel,et al.  Quantum noise of a Michelson-Sagnac interferometer with a translucent mechanical oscillator , 2009, 0912.2603.

[30]  R. Schnabel,et al.  Observation of cw squeezed light at 1550 nm. , 2009, Optics letters.

[31]  Kerry Vahala,et al.  Cavity opto-mechanics. , 2007, Optics express.

[32]  Karsten Danzmann,et al.  Observation of squeezed light with 10-dB quantum-noise reduction. , 2007, Physical review letters.

[33]  R. Schnabel,et al.  Quantum engineering of squeezed states for quantum communication and metrology , 2007, 0707.2845.

[34]  Karsten Danzmann,et al.  Coherent control of broadband vacuum squeezing , 2007, 0704.3796.

[35]  Karsten Danzmann,et al.  Coherent control of vacuum squeezing in the gravitational-wave detection band. , 2006, Physical review letters.

[36]  R. Schnabel,et al.  Squeezed-field injection for gravitational wave interferometers , 2006, 0707.0184.

[37]  Berkeley,et al.  Conversion of conventional gravitational-wave interferometers into quantum nondemolition interferometers by modifying their input and/or output optics , 2000, gr-qc/0008026.

[38]  S. Reynaud,et al.  Quantum Limits in Interferometric Measurements , 1990, quant-ph/0101104.

[39]  Hall,et al.  Generation of squeezed states by parametric down conversion. , 1986, Physical review letters.

[40]  C. Caves.  Quantum Mechanical Noise in an Interferometer , 1981 .

[41]  H. Yuen.  Two-photon coherent states of the radiation field , 1976 .

[42]  A. B. Manukin,et al.  Ponderomotive effects of electromagnetic radiation , 1967 .

[43]  Richard F. Greene,et al.  On a Theorem of Irreversible Thermodynamics , 1952 .