Conditional spin squeezing can be achieved by continuous quantum-nondemolition measurement of an atomic sample. We show that simultaneous feedback of the measurement results can control the quantum state such that the squeezing becomes unconditional. For very strong cavity coupling, the squeezing approaches the Heisenberg limit. Squeezing is also produced at weaker couplings and even in free space, thus presenting a simple experimental test for quantum feedback.

Spin squeezing via continuous QND feedback

MANCINI, Stefano
2003

Abstract

Conditional spin squeezing can be achieved by continuous quantum-nondemolition measurement of an atomic sample. We show that simultaneous feedback of the measurement results can control the quantum state such that the squeezing becomes unconditional. For very strong cavity coupling, the squeezing approaches the Heisenberg limit. Squeezing is also produced at weaker couplings and even in free space, thus presenting a simple experimental test for quantum feedback.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/202404
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