Real-Time Quantum Feedback Control of Atomic Spin-Squeezing
- 9 April 2004
- journal article
- retracted article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 304 (5668) , 270-273
- https://doi.org/10.1126/science.1095374
Abstract
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.Keywords
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