2018 Fiscal Year Annual Research Report
Broadband quantum noise reduction via EPR squeezing
| Project/Area Number |
18H01235
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
LEONARDI MATTEO 国立天文台, 重力波プロジェクト推進室, 助教 (90816448)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | Quantum Optics / Gravitational Wave |
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| Outline of Annual Research Achievements |
The aim of this project is to prove the EPR squeezing technique at frequencies of interest of the GW detectors. This goal will be pursued taking advantage of the already existing TAMA300 facility and the project will be constituted mainly by three items: a frequency independent squeezed light source, a hundreds meter long optical cavity and a double homodyne readout system.
In FY2018 two main achievement were obtained: the round-trip losses of the filter cavity were measured. This is a key parameter that impact on the degradation of the squeezed light. This result was published on PRD (Phys. Rev. D 98, 022010) in July 2018. The second result was the first measurement of frequency independent squeezing. This result was obtained between January and February 2019. After the first measurement a lot of work was devoted in order to improve the first measurement and make the squeezing level more stable.
Other minor research achievement was the installation of a part of the new digital system and the finalization of the design of the filter cavity auto-alignment system.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The project is progressing just about it was planned. In the first FY of the project the freq. independent squeezing source was realized and the first squeezing was measured. The commissioning of this part of the experiment was started and will continue in FY2019.
The filter cavity has been characterized in terms of round trip losses and the auto-alignment system has been designed and will be installed and tested in FY2019 as planned. Due to an heavy failure of the TAMA digital system, some delay have been accumulated and the procurement and installation of a KAGRA-like digital system was slightly delayed. Nevertheless, before the end of FY2018, a large fraction of the new digital system was installed and it is in operation. This new system will allow the continuation of the project despite of the TAMA digital system failure.
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| Strategy for Future Research Activity |
The aim of this project is to prove the EPR squeezing technique at frequencies of interest of the GW detectors. This goal will be pursued taking advantage of the already existing TAMA300 facility and the project will be constituted mainly by three items: a frequency independent squeezed light source, a hundreds meter long optical cavity and a double homodyne readout system. As for most of the other frequency dependent squeezing technique, a frequency independent squeezed light source is mandatory. The installation of this first item was successfully finished in the FY2018 and the first freq. independent squeezed light was measured.
In FY2019 the commissioning of this part will continue to improve the performances and the robustness of it.
After the results on round-trip losses of the filter cavity obtained in FY2018 (published in PRD), for FY2019 the aim is to lock the cavity with the new digital system which was installed in FY2018 and to install an auto alignment system for the FC.
In the second part of FY2019 the design of the readout system will start. This activity will continue in FY2020.
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