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SUMMARY:Compensating decoherence of squeezed light in cavity-enhanced quan
 tum metrology
DTSTART;VALUE=DATE-TIME:20220527T043000Z
DTEND;VALUE=DATE-TIME:20220527T063000Z
DTSTAMP;VALUE=DATE-TIME:20260905T044142Z
UID:indico-contribution-4783@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Quantum states of light are being more commonly used to increa
 se the sensitivity of various sensors. They allow to reach high sensitivit
 y without using significant light power\, and thus find application in var
 ious fields\, from biological sensing to gravitational-wave detection. At 
 the same time\, these states are very fragile\, and even a small amount of
  decoherence can significantly reduce their benefit. We propose a new appr
 oach that allows to compensate part of quantum decoherence\, thus increasi
 ng the sensitivity beyond the previously established decoherence-induced q
 uantum limit. To achieve this\, we use an optimally tuned quantum squeezer
  placed directly inside the detector cavity. This squeezer operates to res
 tore the externally injected squeezing or to amplify the signal\, dependin
 g on the level of loss. It can be flexibly tuned to the optimal operation.
  We present the first experimental combination of intra-cavity and externa
 lly injected squeezing used to enhance detector’s sensitivity. We demons
 trate for the first time how optimal tuning allows to compensate quantum d
 ecoherence. Finally\, we derive the new decoherence-induced quantum limit.
  Based on this approach\, we develop the quantum expander for the detectio
 n bandwidth of GW detectors\, which allows to significantly increase the s
 ensitivity at high frequencies.\n\nhttps://indico.icrr.u-tokyo.ac.jp/event
 /255/contributions/4783/
LOCATION:GatherTown and ZOOM
URL:https://indico.icrr.u-tokyo.ac.jp/event/255/contributions/4783/
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