Journal
JOURNAL OF MODERN OPTICS
Volume 47, Issue 11, Pages 1779-1789Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340008232431
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We derive on the basis of Bayes' theorem a simple but general expression for the retrodicted premeasurement state associated with the result of any measurement. The retrodictive density operator is the normalized probability operator measure element associated with the result. We examine applications to quantum optical cryptography and to the optical beam splitter.
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