Enhancing robustness of multiparty quantum correlations using weak measurement

The Leggett-Garg inequalities serve to test whether or not quantum correlations in time can be explained within a classical macrorealistic framework. We apply this test to thermodynamics and derive a set of Leggett-Garg inequalities for the statistics of fluctuating work done on a quantum system unitarily driven in time. It is shown that these inequalities can be violated in a driven two-level system, thereby demonstrating that there exists no general macrorealistic description of quantum work. These violations are shown to emerge within the standard Two-Projective-Measurement scheme as well as for alternative definitions of fluctuating work that are based on weak measurement. Our results elucidate the influences of temporal correlations on work extraction in the quantum regime and highlight a key difference between quantum and classical thermodynamics.

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Recovering quantum correlations from amplitude damping decoherence by weak measurement reversal

Quantum Information Processing ◽

10.1007/s11128-013-0585-x ◽

2013 ◽

Vol 12 (9) ◽

pp. 3067-3077 ◽

Cited By ~ 21

Author(s):

Yan-Ling Li ◽

Xing Xiao

Keyword(s):

Quantum Correlations ◽

Weak Measurement ◽

Amplitude Damping

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Effect of weak measurement on quantum correlations

Chinese Physics B ◽

10.1088/1674-1056/aba5fa ◽

2020 ◽

Vol 29 (11) ◽

pp. 110301

Author(s):

L Jebli ◽

M Amzioug ◽

S E Ennadifi ◽

N Habiballah ◽

M Nassik

Keyword(s):

Quantum Correlations ◽

Weak Measurement

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Signatures of intrinsic decoherence and weak measurement on quantum correlations

Laser Physics Letters ◽

10.1088/1612-202x/ac3b41 ◽

2021 ◽

Vol 19 (1) ◽

pp. 015204

Author(s):

S Bhuvaneswari ◽

R Muthuganesan ◽

R Radha

Keyword(s):

Magnetic Field ◽

Quantum Correlation ◽

Quantum Correlations ◽

Spin Squeezing ◽

Weak Measurement ◽

Intrinsic Decoherence ◽

Dynamical Behaviors ◽

Correlation Measures ◽

The Impact

Abstract In this article, we consider a pair of spin-1/2 particles with squeezing coupling serving as the physical carrier of quantum information. We then examine the dynamics of quantum correlation quantified by the entanglement and measurement-induced nonlocality (MIN) under the intrinsic decoherence. The impact of intrinsic decoherence on the dynamical behaviors of quantum correlations is investigated. We show that the MIN quantities are more robust, while intrinsic decoherence cause sudden death in entanglement. Besides, we highlight the role of spin squeezing coupling and external magnetic field on quantum correlation measures. Finally, we investigate the impact of weak measurement on MIN.

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