Correlation in quantum states of two identical particlesD. L. Zhou
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences - Beijing 100080, China
received 8 August 2009; accepted in final form 23 September 2009; published October 2009
published online 26 October 2009
We identify the correlation in a state of two identical particles as the residual information beyond what is already contained in the 1-particle reduced density matrix, and propose a correlation measure based on the maximum entropy principle. We obtain the analytical results of the correlation measure, which make it computable for arbitrary two-particle states. We also show that the degrees of correlation in the same two-particle states with different particle types will decrease in the following order: bosons, fermions, and distinguishable particles.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).
03.67.Mn - Entanglement measures, witnesses, and other characterizations.
89.70.Cf - Entropy and other measures of information.
© EPLA 2009