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Efficient Quantum State Estimation by Continuous Weak Measurement and
Dynamical Control
Greg A. Smith, Andrew Silberfarb, Ivan H. Deutsch, Poul S. Jessen
abstract: We demonstrate a fast, robust and non-destructive protocol for quantum state
estimation based on continuous weak measurement in the presence of a controlled
dynamical evolution. Our experiment uses optically probed atomic spins as a
testbed, and successfully reconstructs a range of trial states with fidelities
of ~90%. The procedure holds promise as a practical diagnostic tool for the
study of complex quantum dynamics, the testing of quantum hardware, and as a
starting point for new types of quantum feedback control.
- oai_identifier:
- oai:arXiv.org:quant-ph/0606115
- categories:
- quant-ph
- comments:
- 4 pages, 3 figures
- doi:
- 10.1103/PhysRevLett.97.180403
- arxiv_id:
- quant-ph/0606115
- created:
- 2006-06-13
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