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Quantum Algorithms

Postselected Entangled States by Photon Detection

arXiv
Authors: Pedro Rosario, A. Cidrim, R. Bachelard

Year

2025

Paper ID

17002

Status

Preprint

Abstract Read

~2 min

Abstract Words

79

Citations

N/A

Abstract

Postselection is a non-deterministic mechanism to entangle subsystems, often used in weakly-excited systems. We here show how highly-excited ensembles of two-level emitters can be entangled by photon detection. A collective spin is formed, characterized by a squeezing parameter detected by far-field measurements. While decoherence is detrimental to this conditional entanglement, successive photon detections act as a purification process and restores the spin squeezing. Our work opens up new avenues for the generation of postselected entanglement in open quantum systems.

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  • It adds a 2025 reference point for readers tracking recent quantum research.
  • Postselection is a non-deterministic mechanism to entangle subsystems, often used in weakly-excited systems.

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