Efficient Quantum State Estimation by Continuous Weak Measurement and Dynamical Control
arXiv:quant-ph/0606115 · doi:10.1103/PhysRevLett.97.180403
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.
4 pages, 3 figures
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