Efficient quantum-state estimation by continuous weak measurement and dynamical control

Greg A. Smith, Andrew Silberfarb, Ivan H. Deutsch, Poul S. Jessen

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

We demonstrate a fast, robust, and nondestructive 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 test bed 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.

Original languageEnglish (US)
Article number180403
JournalPhysical review letters
Volume97
Issue number18
DOIs
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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