Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 44, Issue 35, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/44/35/352002
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Funding
- UK EPSRC [EP/G004579/1]
- EPSRC [EP/G004579/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G004579/1] Funding Source: researchfish
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The state disturbance induced by locally measuring a quantum system yields a signature of nonclassical correlations beyond entanglement. Here, we present a detailed study of such correlations for two-qubit mixed states. To overcome the asymmetry of quantum discord and the unfaithfulness of measurement-induced disturbance (severely overestimating quantum correlations), we propose an ameliorated measurement-induced disturbance as nonclassicality indicator, optimized over joint local measurements, and we derive its closed expression for relevant two-qubit states. We study its analytical relation with discord, and characterize the maximally quantum-correlated mixed states, that simultaneously extremize both quantifiers at given von Neumann entropy: among all two-qubit states, these states possess the most robust quantum correlations against noise.
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