Journal
SCIENCE
Volume 304, Issue 5668, Pages 270-273Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1095374
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Real-time feedback performed during a quantum nondemolition measurement of atomic spin-angular momentum allowed us to influence the quantum statistics of the measurement outcome. We showed that it is possible to harness measurement backaction as a form of actuation in quantum control, and thus we describe a valuable tool for quantum information science. Our feedback-mediated procedure generates spin-squeezing, for which the reduction in quantum uncertainty and resulting atomic entanglement are not conditioned on the measurement outcome.
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