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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.
Why This Paper Matters
- 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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