Physics – Quantum Physics
Scientific paper
2005-05-22
J. Opt. B: Quantum Semiclass. Opt. 7, S421-S428, (2005).
Physics
Quantum Physics
Accepted for publication in Journal of Optics:B special issue on Quantum Control
Scientific paper
10.1088/1464-4266/7/10/032
Quantum optical states which have no coherent amplitude, such as squeezed vacuum states, can not 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.
Goda Keisuke
Gray Malcolm B.
Grosse Nicolai
Lam Ping Koy
Mavalvala Nergis
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