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Cited by 316

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Measurements continuous in time and a posteriori states in quantum mechanics

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Barchielli, A, Belavkin, V P·1991·Journal of Physics A: Mathematical and General

Abstract

Measurements continuous in time have been consistently introduced in quantum mechanics and applications worked out, mainly in quantum optics. In this context a quantum filtering theory has been developed giving the reduced state after a measurement when a certain trajectory of the measured observables is registered (the a posteriori states). In this paper a new derivation of filtering equations is presented for the cases of counting processes and of measurement processes of diffusive type. It is also shown that the equation for the a posteriori dynamics in the diffusive case can be obtained, by a suitable limit, from that in the counting case. Moreover, the paper is intended to clarify the meaning of the various concepts involved and to discuss the connections among them. As an illustration of the theory, simple models are worked out.

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Crossref · 10.1088/0305-4470/24/7/022

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Metadata

Authors
Barchielli, A., & Belavkin, V. P.
Venue
Journal of Physics A: Mathematical and General
Published
1991-04-07
Volume
24
Issue
7
Pages
1495-1514
ISSN
  • 0305-4470 (ISSN-L)
  • 1361-6447
OpenAlex
W2088145502
Cited by
316
References
3
FWCI
4.80
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Measurements continuous in time and a posteriori states in quantum mechanics. https://app.cochat.ai/papers/10.1088/0305-4470/24/7/022
The paper
Barchielli, A., & Belavkin, V. P. (1991). Measurements continuous in time and a posteriori states in quantum mechanics. Journal of Physics A: Mathematical and General. https://doi.org/10.1088/0305-4470/24/7/022

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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.