Super-quantum correlation for SU(2) invariant state in 4⊗2 system

We analytically evaluate the weak one-way deficit and super-quantum discord for a system composed of spin-3/2 and spin-1/2 subsystems possessing SU (2) symmetry. We also make a comparative study of the relationships among the quantum discord, one-way deficit, weak one-way deficit, and super-quantum...

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Bibliographic Details
Published in:Quantum information processing 2018, Vol.17 (4), p.1-7
Main Authors: Li, Lin-Song, Tao, Yuan-Hong, Nan, Hua, Xu, Hui
Format: Article
Language:English
Subjects:
Data Structures and Information Theory
Invariants
Mathematical Physics
Physics
Physics and Astronomy
Quantum Computing
Quantum Information Technology
Quantum Physics
Spintronics
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Summary:We analytically evaluate the weak one-way deficit and super-quantum discord for a system composed of spin-3/2 and spin-1/2 subsystems possessing SU (2) symmetry. We also make a comparative study of the relationships among the quantum discord, one-way deficit, weak one-way deficit, and super-quantum discord for the SU (2) invariant state. It is shown that super-quantum discord via weak measurement is greater than that via von Neumann measurement. But weak one-way deficit is less than the one-way deficit. As a result, weak measurement do not always reveal more quantumness.
ISSN:1570-0755
1573-1332
DOI:10.1007/s11128-017-1789-2