Work

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

Year: 2026

Type: preprint

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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.08438

Authors: Yuanbek, Janarbek, Bekele, Zelalem Abebe, Liu, Zhi-qiang

Institutions: University of Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of Semiconductors

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, University of Chinese Academy of Sciences, National Science and Technology Major Project, National Key Research and Development Program of China

Awards: G2406612915, G252737441, G3074081714, G5187297705, G5395732305

OpenAlex ID: W7221053663

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