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SUMMARY:Current Status of Quantum Locking Experiment for Space Gravitation
 al Wave Antenna DECIGO
DTSTART;VALUE=DATE-TIME:20220524T043000Z
DTEND;VALUE=DATE-TIME:20220524T063000Z
DTSTAMP;VALUE=DATE-TIME:20260309T155233Z
UID:indico-contribution-4853@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:The DECi-hertz Interferometer Gravitational wave Observatory (
 DECIGO) is the future Japanese space mission with 1\,000 km arm cavities. 
 One of the main objectives of DECIGO is the detection of primordial gravit
 ational waves (PGWs) produced in the inflation period. We should improve D
 ECIGO’s target sensitivity\, which is limited by quantum noise\, to enha
 nce the possibility of the detection of PGWs.\n\nThe standard squeezing te
 chniques to reduce the quantum noise are not effective because of the larg
 e diffraction loss in DECIGO due to the long arm length. Therefore\, we pr
 oposed a new method\, quantum locking with an optical spring\, to reduce t
 he quantum noise in a relatively broad frequency band. Quantum locking is 
 the technique\, in which each mirror of the long arm cavity (main cavity) 
 is shared by two short-arm cavities (sub-cavities). Then the sub-cavities 
 control the mirrors’ motion of the main cavity. Interferometer signals o
 btained from the main cavity and the two sub-cavities can be combined to o
 ptimize the sensitivity of DECIGO.\n\nIn parallel with the theoretical ana
 lysis of the technique\, we have been performing the experiment to verify 
 the principle of the theory. In this poster session\, we explain the curre
 nt status of the quantum locking experiment.\n\nhttps://indico.icrr.u-toky
 o.ac.jp/event/255/contributions/4853/
LOCATION:GatherTown and ZOOM
URL:https://indico.icrr.u-tokyo.ac.jp/event/255/contributions/4853/
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