Effect of weak measurement on quantum correlations

doi:10.1088/1674-1056/aba5fa

Abstract

We investigate the local quantum uncertainty (LQU ) in weak measurement. An expression of weak LQU is explicitly determined. Also, we consider some cases of three special X states, Werner state, circulant two-qubit states, and Heisenberg model via LQU in normal and weak measurements. We find that the LQU in weak measurement is weaker than the case of strong measurement.

Keywords: local quantum uncertainty weak measurement weak local quantum uncertainty

Received: 21 April 2020
Revised: 29 June 2020
Accepted manuscript online: 15 July 2020

Corresponding Authors: ^†Corresponding author. E-mail: vitto.han@gmail.com

Cite this article:

L Jebli, M Amzioug, S E Ennadifi, N Habiballah, and M Nassik$ Effect of weak measurement on quantum correlations 2020 Chin. Phys. B 29 110301

Fig. 1.

Effect of measurement strength on LQU and WLQU for various z with x = 0.2, x = 0.8, x = 1.5.

Fig. 2.

Weak LQU for different values of x with z = 1.

Fig. 3.

LQU and WLQU as functions of ϵ for various values of g at x = 1.2.

Fig. 4.

Evolution of (a) LQU and (b) WLQU for suitable parameter of B, where T = 1 for different values of J.

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