Cascaded Entanglement Enhancement
Zhihui Yan, Xiaojun Jia, Xiaolong Su, Zhiyuan Duan, Changde Xie, and, Kunchi Peng
TL;DR
This paper demonstrates a cascaded system of three NOPAs that significantly enhances quantum entanglement of optical fields, with experimental results aligning well with theoretical calculations.
Contribution
It introduces a novel cascaded NOPA system for continuous-variable entanglement enhancement and provides both experimental validation and theoretical analysis.
Findings
Entanglement improved from -5.3 dB to -8.1 dB below the quantum noise limit.
Dependence of entanglement on NOPA parameters is characterized.
Theoretical calculations agree with experimental results.
Abstract
We present a cascaded system consisting of three non-degenerate optical parametric amplifiers (NOPAs) for the generation and the enhancement of quantum entanglement of continuous variables. The entanglement of optical fields produced by the first NOPA is successively enhanced by the second and the third NOPAs from -5.3 to -8.1 below the quantum noise limit. The dependence of the enhanced entanglement on the physical parameters of the NOPAs and the reachable entanglement limitation for a given cascaded NOPA system are calculated. The calculation results are in good agreement with the experimental measurements.
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