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A Positive Operator-valued Measure for Two-photon Detection via Sum-frequency Generation by Merkouche, Sofiane; Thiel, Valérian; Smith, Brian J. is a scholarly article available to read on EtoBox.

What is A Positive Operator-valued Measure for Two-photon Detection via Sum-frequency Generation about?

Spontaneous parametric down conversion (PDC), in the perturbative limit, can be considered as a probabilistic splitting of one input photon into two output photons. Conversely, sum-frequency generation (SFG) implements the reverse process of combining two input photons into one. Here we show that a single-photon projective measurement in the temporal-mode basis of the output photon of a two-photon SFG process effects a generalized measurement on the input two-photon state. We describe the positive-operator-valued measure (POVM) associated with such a measurement, and show that its elements are proportional to the two-photon states produced by the time-reversed PDC process. Such a detection acts as a joint measurement on two photons, and is thus an important component of many quantum information processing protocols relying on photonic entanglement. Using the retrodictive approach, we analyze the properties of the two-photon POVM that are relevant for quantum protocols exploiting two-photon states and measurements.

Author

Merkouche, Sofiane; Thiel, Valérian; Smith, Brian J.

Published

2021

Language

EN