Quantum state reconstruction via continuous measurement

Andrew Silberfarb, Poul S. Jessen, Ivan H. Deutsch

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number030402
JournalPhysical review letters
Volume95
Issue number3
DOIs
StatePublished - Jul 15 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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