Continuous quantum nondemolition feedback and unconditional atomic spin squeezing

Details Continuous quantum nondemolition feedback and unconditional atomic spin squeezing Continuous quantum nondemolition feedback and unconditional atomic spin squeezing

2002-08-27

arxiv.org/abs/quant-ph/0208160v1

J. Phys. B: At. Mol. Opt. Phys. 35 (2002) 4937-4952

Physics

Quantum Physics

17 pages, 5 figures, submitted to JPB

Scientific paper

10.1088/0953-4075/35/23/316

We discuss the theory and experimental considerations of a quantum feedback scheme for producing deterministically reproducible spin squeezing. Continuous nondemolition atom number measurement from monitoring a probe field conditionally squeezes the sample. Simultaneous feedback of the measurement results controls the quantum state such that the squeezing becomes unconditional. We find that for very strong cavity coupling and a limited number of atoms, the theoretical squeezing approaches the Heisenberg limit. Strong squeezing will still be produced at weaker coupling and even in free space (thus presenting a simple experimental test for quantum feedback). The measurement and feedback can be stopped at any time, thereby freezing the sample with a desired amount of squeezing.

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