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2020 Fiscal Year Annual Research Report

Broadband quantum noise reduction via EPR squeezing

Research Project

Project/Area Number 18H01235
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

LEONARDI MATTEO  国立天文台, 重力波プロジェクト, 助教 (90816448)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywordsfreq. dep. squeezing / filter cavity / quantum optics / gravitational wave / KAGRA
Outline of Annual Research Achievements

After the world first measurement of frequency dependent squeezing achieved at the end of FY2019, several degradation sources were identified: the major ones being the injection/readout optical losses and the filter cavity alignment and length stability. In FY2020, many degradation sources were addressed and solved.
On the FIS side, the optical losses were reduced from 25% to 18% allowing for the measurement of 6.5dB of squeezing. To further reduce this losses, new AR coating for the PPKTP crystal of the OPO was procured and the installation of the new OPO with reduced optical losses is ongoing. On the Injection/readout optical losses, the design of a new in vacuum Faraday isolator was finalized. The implementation of this new FI should reduce the optical losses of the injection/readout path by approximately 10%. For what concern the FC alignment, an auto-alignment system, based on radio-frequency demodulated quadrant photodiodes, was successfully implemented. With this AA system, the long term stability of the FC was greatly improved allowing for better measurement.
Finally, large fraction of FY2020 was devoted to the theoretical design, implementation and testing of a novel technique for FC length control. This technique is called Coherent Control of the Filter Cavity. The theoretical study was published on Physical Review D. This technique was successfully implemented in the FC experiment allowing for a length noise reduction of more than a factor of five. A paper on the experimental demonstration of this technique is being realized and will be submitted soon to PRD.

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

  • Research Products

    (10 results)

All 2021 2020

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (8 results) (of which Invited: 1 results)

  • [Journal Article] Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors2020

    • Author(s)
      Zhao Y.、Aritomi N.、Capocasa E.、Leonardi M.、Eisenmann M.、Guo Y.、Polini E.、Tomura A.、Arai K.、Aso Y.、Huang Y.-C.、Lee R.-K.、Lueck H.、Miyakawa O.、Prat P.、Shoda A.、Tacca M.、Takahashi R.、Vahlbruch H.、Vardaro M.、Wu C.-M.、Barsuglia M.、Flaminio R.
    • Journal Title

      Physical Review Letters

      Volume: 124 Pages: 171101

    • DOI

      10.1103/PhysRevLett.124.171101

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Control of a filter cavity with coherent control sidebands2020

    • Author(s)
      Aritomi Naoki、Leonardi Matteo、Capocasa Eleonora、Zhao Yuhang、Flaminio Raffaele
    • Journal Title

      Physical Review D

      Volume: 102 Pages: 042003

    • DOI

      10.1103/PhysRevD.102.042003

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] KAGRA Filter Cavity development2021

    • Author(s)
      Matteo Leonardi
    • Organizer
      Ligo-Virgo-Kagra meeting (March 2021)
  • [Presentation] New Control Scheme of a Filter Cavity for Gravitational Wave Detectors2021

    • Author(s)
      Naoki Aritomi
    • Organizer
      JPS 2021 spring meeting
  • [Presentation] Development of a frequency dependent squeezed vacuum source for broadband quantum noise reduction in advanced gravitational-wave detectors2020

    • Author(s)
      Yuhang Zhao
    • Organizer
      KAGRA 25th F2F
  • [Presentation] Frequency Dependent Squeezing with 300 m filter cavity in TAMA2020

    • Author(s)
      Naoki Aritomi
    • Organizer
      KAGRA 25th F2F
  • [Presentation] Development of Frequency Dependent Squeezing for Gravitational Wave Detectors (4)2020

    • Author(s)
      Naoki Aritomi
    • Organizer
      JPS 2020 autumn meeting
  • [Presentation] PRD1: Filter cavity report2020

    • Author(s)
      Matteo Leonardi
    • Organizer
      KAGRA 26th F2F
  • [Presentation] Frequency dependent squeezing experiment at NAOJ: status and future2020

    • Author(s)
      Matteo Leonardi
    • Organizer
      7th Kagra International Workshop
    • Invited
  • [Presentation] Frequency-Dependent Squeezing for Gravitational-Wave Detectors2020

    • Author(s)
      Naoki Aritomi
    • Organizer
      7th Kagra International Workshop

URL: 

Published: 2021-12-27  

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