The Semiannual Report of the Msu Group
نویسندگان
چکیده
The universal formula for the minimal required energy in optical resonators of the antennae attaining resolution at the level of the standard quantum limit is obtained (see Appendix A). The complete analysis of a new topology of interferometric gravitational wave antenna is presented. This new scheme is based on princilples of quantum intracavity measurements of crossquadrature observable and utilizes features of speci c quantum state { symphotonic state. It is shown that this scheme can provide the same sensitivity as traditional topologies but at signi cantly lower levels of circulating power. If characteristic frequency of the gravitational signal is equal to 10=2 Hz then the optical energy stored in the resonators has to be 10 erg for the parameters of LIGO, that is 3 orders of magnitude lower than the energy required in traditional schemes if the sensitivity has to be close to the SQL. In optical bars scheme, intracavity quantum measurement allows to obtain better resolution (better than SQL) with moderate requirements to circulating power. The key element of the suggested intracavity scheme of gravitational wave antenna is mechanical quantum limited sensor. Currently we are analysing in collaboration with K.Thorne and his group a practical scheme of mechanical QND speed meter.
منابع مشابه
Semiannual Report of Msu Group the Researches Were Supported by Nsf Grant Phy0098715 " Low Noise Suspensions and Readout Systems for Ligo " ( Contents
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