Quantumness of noisy quantum walks: A comparison between measurement-induced disturbance and quantum discord

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.064302· OSTI ID:21550232

Rao, Balaji R; Srikanth, R; Chandrashekar, C M; Banerjee, Subhashish ^[1]

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1. Poornaprajna Institute of Scientific Research, Sadashivnagar, Bengaluru 560 080 (India)

Noisy quantum walks are studied from the perspective of comparing their quantumness as defined by two popular measures, measurement-induced disturbance (MID) and quantum discord (QD). While the former has an operational definition, unlike the latter, it also tends to overestimate nonclassicality because of a lack of optimization over local measurements. Applied to quantum walks, we find that MID, while acting as a loose upper bound on QD, still tends to reflect correctly trends in the behavior of the latter. However, there are regimes where its behavior is not indicative of nonclassicality: in particular, we find an instance where MID increases with the application of noise, where we expect a reduction of quantumness.

• OSTI ID: 21550232
• Journal Information: Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.064302; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPARATIVE EVALUATIONS
DISTURBANCES
EXPECTATION VALUE
EXPERIMENTAL DATA
NOISE
OPTIMIZATION
QUANTUM MECHANICS
DATA
EVALUATION
INFORMATION
MECHANICS
NUMERICAL DATA