Efficient Quantum State Estimation by Continuous Weak Measurement and Dynamical Control

Details Efficient Quantum State Estimation by Continuous Weak Measurement and Dynamical Control Efficient Quantum State Estimation by Continuous Weak Measurement and Dynamical Control

2006-06-13

arxiv.org/abs/quant-ph/0606115v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.97.180403

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.

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