Quantum retrodiction

John Jeffers; Daniel K.L. Oi; Thomas Brougham

doi:10.1098/rsta.2023.0338

Quantum retrodiction

John Jeffers^*, Daniel K.L. Oi, Thomas Brougham

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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 summarize 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.

Original language	English
Article number	20230338
Number of pages	15
Journal	Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume	382
Issue number	2287
Early online date	24 Dec 2024
DOIs	https://doi.org/10.1098/rsta.2023.0338
Publication status	Published - 30 Dec 2024

Keywords

retrodiction
detection
measurement

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10.1098/rsta.2023.0338Licence: CC BY 4.0

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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 summarize 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.",

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AU - Brougham, Thomas

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AB - 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 summarize 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.

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Quantum retrodiction

Abstract

Keywords

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