Quantum retrodiction

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Jeffers, John and Oi, Daniel K.L. and Brougham, Thomas (2024) Quantum retrodiction. Philosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences. ISSN 1471-2962 (In Press) (https://doi.org/10.1098/rsta.2023.0338)

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Abstract

Quantum retrodiction, in which the state of a quantum system prior to a measurement is assigned based on the results of that measurement, has had a long history and has been used in quantum optics research for decades. Here we summarise the theory and point out some of the more interesting results, before applying the theory to state identification from multiple shots of an experiment. One surprising result is that we show that a photodetector with low quantum efficiency can discriminate between photonic states better than a detector with a higher efficiency.

ORCID iDs

Jeffers, John ORCID logoORCID: https://orcid.org/0000-0002-8573-1675, Oi, Daniel K.L. ORCID logoORCID: https://orcid.org/0000-0003-0965-9509 and Brougham, Thomas;
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