TY - JOUR
T1 - Observable correlations in two-qubit states
AU - Luo, Shunlong
AU - Zhang, Qiang
PY - 2009/7
Y1 - 2009/7
N2 - The total correlations in a bipartite quantum state are well quantified by the quantum mutual information, the amount of which is not necessarily fully extractable by local measurements. The observable correlations are the maximal correlations that can be extracted via local measurements, and have an intuitive interpretation as a measure of classical correlations. We evaluate the observable correlations for generic two-qubit states and obtain analytical expressions in some particular cases. The intricate and subtle relationships among the total, quantum and classical correlations are illustrated in terms of observable correlations. In the course, we also disprove an intuitive conjecture of Lindblad which states that the classical correlations account for at least half of the total correlations, or equivalently, correlations are more classical than quantum. © Springer Science+Business Media, LLC 2009.
AB - The total correlations in a bipartite quantum state are well quantified by the quantum mutual information, the amount of which is not necessarily fully extractable by local measurements. The observable correlations are the maximal correlations that can be extracted via local measurements, and have an intuitive interpretation as a measure of classical correlations. We evaluate the observable correlations for generic two-qubit states and obtain analytical expressions in some particular cases. The intricate and subtle relationships among the total, quantum and classical correlations are illustrated in terms of observable correlations. In the course, we also disprove an intuitive conjecture of Lindblad which states that the classical correlations account for at least half of the total correlations, or equivalently, correlations are more classical than quantum. © Springer Science+Business Media, LLC 2009.
KW - Classical correlations
KW - Lindblad conjecture
KW - Observable correlations
KW - Quantum mutual information
KW - Von Neumann measurement
UR - http://www.scopus.com/inward/record.url?scp=70349314942&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-70349314942&origin=recordpage
U2 - 10.1007/s10955-009-9779-0
DO - 10.1007/s10955-009-9779-0
M3 - RGC 21 - Publication in refereed journal
VL - 136
SP - 165
EP - 177
JO - Journal of Statistical Physics
JF - Journal of Statistical Physics
SN - 0022-4715
IS - 1
ER -