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PreprintarXiv licencearXiv

Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent States

  • Janarbek Yuanbek
  • Zelalem Abebe Bekele
  • Zhi-qiang Liu
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Abstract

We investigate how post-selected von Neumann measurements modify the nonclassical properties of two-mode entangled coherent states (ECSs). From the conditional pointer state, we characterize squeezing, photon statistics, intermode correlations, entanglement, fidelity, and post-selection probability. Anomalous weak values with moderate coupling enhance squeezing, antibunching, sub-Poissonian statistics, intermode correlations, and bipartite entanglement, while fidelity captures the crossover from weak perturbation to strong distinguishability. These results demonstrate post-selection as a tunable approach to engineering ECSs.

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Cite

BibTeXRIS
BibTeX
@misc{yuanbek2026harnessing,
  title = {{Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent States}},
  author = {Janarbek Yuanbek and Zelalem Abebe Bekele and Zhi-qiang Liu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.08438},
  eprint = {2610.08438},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.08438},
}
RIS
TY  - UNPB
TI  - Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent States
AU  - Janarbek Yuanbek
AU  - Zelalem Abebe Bekele
AU  - Zhi-qiang Liu
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2610.08438
UR  - https://arxiv.org/abs/2610.08438
AB  - We investigate how post-selected von Neumann measurements modify the nonclassical properties of two-mode entangled coherent states (ECSs). From the conditional pointer state, we characterize squeezing, photon statistics, intermode correlations, entanglement, fidelity, and post-selection probability. Anomalous weak values with moderate coupling enhance squeezing, antibunching, sub-Poissonian statistics, intermode correlations, and bipartite entanglement, while fidelity captures the crossover from weak perturbation to strong distinguishability. These results demonstrate post-selection as a tunable approach to engineering ECSs.
ER  -