Extra phase noise from thermal fluctuations in nonlinear optical crystals

Cesar, J. E. S.; Coelho, A. S.; Cassemiro, K. N.; Villar, A. S.; Lassen, M.; Nussenzveig, P.; Martinelli, M.

doi:10.1103/PhysRevA.79.063816

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Extra phase noise from thermal fluctuations in nonlinear optical crystals

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Cassemiro, K. N.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Villar, A. S.
4pi Photon Atom Coupling, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Cesar, J. E. S., Coelho, A. S., Cassemiro, K. N., Villar, A. S., Lassen, M., Nussenzveig, P., et al. (2009). Extra phase noise from thermal fluctuations in nonlinear optical crystals. PHYSICAL REVIEW A, 79(6): 063816. doi:10.1103/PhysRevA.79.063816.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6BD7-D

Abstract

We show theoretically and experimentally that scattered light by thermal phonons inside a second-order nonlinear crystal is the source of additional phase noise observed in optical parametric oscillators. This additional phase noise reduces the quantum correlations and has hitherto hindered the direct production of multipartite entanglement in a single nonlinear optical system. We cooled the nonlinear crystal and observed a reduction in the extra noise. Our treatment of this noise can be successfully applied to different systems in the literature.