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Prediction of spatially localised noise reduction below the standard quantum limit at domain walls in arrays of cavity spatial solitons

A single mode degenerate OPO generates above threshold a sub-harmonic field with a phase uncertainty of pi, which switches between its two possible solutions when it is perturbed. USTRAT has studied the transverse properties of this device and shown that, when one uses a transverse multimode cavity such a planar cavity instead of a single mode one, the OPO generates complex transverse patterns in which the two solutions co-exist.

They are separated by domain-walls in which the pi-phase shift occurs. Two domain walls may lock to each other, and form cavity solitons, which can further organize themselves in regular soliton arrays. These solitons are stable and can be generated or erased by external causes. USTRAT has shown the importance of quantum noise in inducing the soliton arrays, and of a spatial phase modulation of the pump in both stabilizing their geometry and steering them.

A local squeezing of quantum fluctuations at the exact location of the domain walls has also been predicted. These researches are indications of the potential interest of cavity soliton arrays as a spatial register of information.

Reported by

University of Strathclyde
G4 0NG Glasgow
United Kingdom
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