Testing local-realism and macro-realism under generalized dichotomic measurements

Abstract

Generalised quantum measurements with two outcomes are fully characterised by two real parameters, dubbed as sharpness parameter and biasedness parameter and they can be linked with different aspects of the experimental setup. It is known that precision of measurements, characterised by the sharpness parameter of the measurements, reduces the possibility of probing quantum features like violation of local-realism (LR) or macro-realism (MR). Here we investigate the effect of biasedness together with sharpness of measurement and find a trade-off between those two parameters in the context of probing violation of LR and MR. Interestingly we also find the above mentioned trade-off is more robust in the later case.

10 pages, 3 figures

References in corpus (6)

• Reference frames, superselection rules, and quantum information
• Self-testing of binary observables based on commutation
• Coexistence of qubit effects
• Unsharp Quantum Reality
• Wigner's form of the Leggett-Garg inequality, No-Signalling in Time, and Unsharp Measurements
• Inequivalent Leggett-Garg inequalities

Cited by in corpus (7)

• Self-testing of binary Pauli measurements requiring neither entanglement nor any dimensional restriction
• Creating quantum correlations in generalized entanglement swapping
• Persistence of quantum violation of macrorealism for large spins even under coarsening of measurement times
• Wigner Inequalities for Test of Hypothesis of Realism and Concepts of Macroscopic and Local Realism
• Role of nonclassical temporal correlation in powering quantum random access codes
• Quantum violation of macrorealism under multi-outcome two-parameter generalised measurements
• Projective measurements under qubit quantum channels