Weak quantum discord
| Autor: | Renato M. Angelo, P. R. Dieguez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Quantum discord
Quantum Physics Quantitative Biology::Tissues and Organs FOS: Physical sciences Statistical and Nonlinear Physics State (functional analysis) 01 natural sciences 010305 fluids & plasmas Theoretical Computer Science Electronic Optical and Magnetic Materials Interpretation (model theory) Theoretical physics Quantifier (logic) Modeling and Simulation 0103 physical sciences Signal Processing Weak measurement Electrical and Electronic Engineering Quantum Physics (quant-ph) 010306 general physics Quantum mutual information Quantum computer Mathematics |
| Popis: | Originally introduced as the difference between two possible forms of quantum mutual information, quantum discord has posteriorly been shown to admit a formulation according to which it measures a distance between the state under scrutiny and the closest projectively measured (non-discordant) state. Recently, it has been shown that quantum discord results in higher values when projective measurements are substituted by weak measurements. This sounds paradoxical since weaker measurements should imply weaker disturbance and, thus, a smaller distance. In this work we solve this puzzle by presenting a quantifier and an underlying interpretation for what we call weak quantum discord. As a by-product, we introduce the notion of symmetrical weak quantum discord. 12 pages, 1 figure |
| Databáze: | OpenAIRE |
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