Quantum Entanglement and Order Parameter in a Paired Finite Fermi System

Details Quantum Entanglement and Order Parameter in a Paired Finite Fermi System Quantum Entanglement and Order Parameter in a Paired Finite Fermi System

2002-09-04

arxiv.org/abs/cond-mat/0209079v1

Solid State Communications 124 (2002) 473-476

Physics

Condensed Matter

Superconductivity

submitted to Solid State Communications (the Festschrift in the honor of Prof. Salim Ciraci's 60th birthday)

Scientific paper

10.1016/S0038-1098(02)00551-3

We study the pairing correlations in a finite Fermi system from quantum entanglement point of view. We investigate the relation between the order parameter, which has been introduced recently to describe both finite and infinite superconductors, and the concurrence. For a proper definition of the concurrence, we argue that a possible generalization of spin flip transformation is time reversal operation. While for a system with indefinite number of particles concurrence is a good measure of entanglement, for a finite system it does not distinguish between normal and superconducting states. We propose that the expectation value of the radial operator for the total pseudospin can be used to identify entanglement of pairing.

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