Tripartite continuous-variable entanglement of NOPA system

doi:10.1088/1674-1056/27/8/084204

Abstract We investigate the fundamental limits to the achievable tripartite continuous-variable (CV) entanglement criterion of a generalized V₁ criterion. Our numerical simulation results show that the non-degenerate eigenvalues do effect the performances of the estimated minimum variances. From below the threshold to above the threshold, with the increase of the pump parameter, the tripartite CV entanglement gradually disappears. The different off-diagonal elements seriously distort the weights for entanglement. We can obtain a good tripartite CV entanglement by appropriately controlling the values of off-diagonal elements ε_ij.

Keywords: continuous-variable entanglement generalized V₁ criterion non-degenerate eigenvalues

Received: 12 December 2017
Revised: 07 March 2018
Accepted manuscript online:

PACS:	42.50.Lc	(Quantum fluctuations, quantum noise, and quantum jumps)
	42.65.Lm	(Parametric down conversion and production of entangled photons)

Fund: Projected supported by the National Natural Science Foundation of China (Grant No. 11504074) and the Science Fund from the State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Shanxi, China (Grant No. KF201601).

Corresponding Authors: Chao-Ying Zhao
E-mail: zchy49@hdu.edu.cn

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Chao-Ying Zhao(赵超樱), Cheng-Mei Zhang(张成梅) Tripartite continuous-variable entanglement of NOPA system 2018 Chin. Phys. B 27 084204

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