Quantum State Reconstruction via Continuous Measurement
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
- Optical Sciences Center, University of Arizona, Tucson, Arizona 85721 (United States)
We present a new procedure for quantum state reconstruction based on weak continuous measurement of an ensemble average. By applying controlled evolution to the initial state, new information is continually mapped onto the measured observable. A Bayesian filter is then used to update the state estimate in accordance with the measurement record. This generalizes the standard paradigm for quantum tomography based on strong, destructive measurements on separate ensembles. This approach to state estimation induces minimal perturbation of the measured system, giving information about observables whose evolution cannot be described classically in real time and opening the door to new types of quantum feedback control.
- OSTI ID:
- 20696439
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 3; Other Information: DOI: 10.1103/PhysRevLett.95.030402; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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