Quantum Noise Locking

Details Quantum Noise Locking Quantum Noise Locking

2005-05-22

arxiv.org/abs/quant-ph/0505164v1

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.

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