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Project Leader
dr hab. Konrad Banaszek
Tel: +48 (22) 55 32 306
Fax: +48 (22) 621 94 75
Project administration
Tel: +48 (22) 55 32 405
Fax: +48 (22) 621 94 75
Institute of Theoretical Physics
Faculty of Physics
ul. Hoża 69
00-681 Warszawa
Paper on the optimality of quantum enhancement in the GEO600 gravitational wave detector published
It is theoretically demonstrated that the recently reported quantum-noise-limited sensitivity of the squeezed-light-enhanced German-British gravitational wave detector GEO 600 is exceedingly close to the fundamental theoretical bound, given the present amount of optical loss. Furthermore, it is proven that the employed combination of a bright coherent state and a squeezed vacuum state is generally the optimum practical approach for phase estimation with high precision on absolute scales. [Demkowicz-Dobrzanski et al, Phys. Rev. A 88, 041802(R) (2013)]