Kirk McKenzie et al 2005 J. Opt. B: Quantum Semiclass. Opt. 7 S421 doi:10.1088/1464-4266/7/10/032
Kirk McKenzie1, Eugeniy E Mikhailov2, Keisuke Goda2, Ping Koy Lam3, Nicolai Grosse3, Malcolm B Gray1, Nergis Mavalvala2 and David E McClelland1
Show affiliationsQuantum optical states which have no coherent amplitude, such as squeezed vacuum states, cannot rely on standard readout techniques to generate error signals for control of the quadrature phase. Here we investigate the use of asymmetry in the quadrature variances to obtain a phase-sensitive readout and to lock the phase of a squeezed vacuum state, a technique which we call noise locking (NL). We carry out a theoretical derivation of the NL error signal and the associated stability of the squeezed and anti-squeezed lock points. Experimental data for the NL technique both in the presence and absence of coherent fields are shown, including a comparison with coherent locking techniques. Finally, we use NL to enable a stable readout of the squeezed vacuum state on a homodyne detector.
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
Issue 10 (October 2005)
Received 15 March 2005, accepted for publication 19 May 2005
Published 26 September 2005
Kirk McKenzie et al 2005 J. Opt. B: Quantum Semiclass. Opt. 7 S421
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