Quantum interference of distinguishable photons based on spatially resolved measurements

Miguel Angel Gonzalez Ballester; Alejandra  Alarcón; Andres  Camilo Quintero; Daniel  Sabogal; Luca Maggio; Vincenzo Tamma; Daniel  Urrego; Alejandra  Valencia

doi:10.1103/npy3-mzrl

Quantum interference of distinguishable photons based on spatially resolved measurements

Miguel Angel Gonzalez Ballester
, Alejandra Alarcón
, Andres Camilo Quintero
, Daniel Sabogal
, Luca Maggio
, Vincenzo Tamma
, Daniel Urrego
, Alejandra Valencia

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

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Abstract

We present experimental results demonstrating the quantum interference of two photons distinguishable in their transverse momenta, each entering the input ports of a balanced beam splitter. This counterintuitive interference effect is made possible through spatially resolved measurements in the near field, i.e., by resolving the conjugate variable in which the photons are distinguishable. Our experimental findings agree with theoretical predictions. We contrast our results with a nonspatially resolved measurement where averaging over the photons' positions washes out the quantum interference observed in spatially resolved measurements.

Original language	English
Article number	053721
Number of pages	9
Journal	Physical Review A
Volume	113
DOIs	https://doi.org/10.1103/npy3-mzrl
Publication status	Published - 26 May 2026

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10.1103/npy3-mzrl

Quantum interference of distinguishable photons
Miguel Angel Gonzalez, Alejandra Alarcón, Andres Camilo Quintero, Daniel Sabogal, Luca Maggio, Vincenzo Tamma, Daniel F. Urrego and Alejandra Valencia (2026). 'Quantum interference of distinguishable photons based on spatially resolved measurements'. Physical Review A, 113(5), 053721(9). © 2026 American Physical Society. All rights reserved.
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abstract = "We present experimental results demonstrating the quantum interference of two photons distinguishable in their transverse momenta, each entering the input ports of a balanced beam splitter. This counterintuitive interference effect is made possible through spatially resolved measurements in the near field, i.e., by resolving the conjugate variable in which the photons are distinguishable. Our experimental findings agree with theoretical predictions. We contrast our results with a nonspatially resolved measurement where averaging over the photons' positions washes out the quantum interference observed in spatially resolved measurements.",

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AU - Alarcón, Alejandra

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AU - Maggio, Luca

AU - Tamma, Vincenzo

AU - Urrego, Daniel

AU - Valencia, Alejandra

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AB - We present experimental results demonstrating the quantum interference of two photons distinguishable in their transverse momenta, each entering the input ports of a balanced beam splitter. This counterintuitive interference effect is made possible through spatially resolved measurements in the near field, i.e., by resolving the conjugate variable in which the photons are distinguishable. Our experimental findings agree with theoretical predictions. We contrast our results with a nonspatially resolved measurement where averaging over the photons' positions washes out the quantum interference observed in spatially resolved measurements.

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Quantum interference of distinguishable photons based on spatially resolved measurements

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