Physics – Quantum Physics
Scientific paper
2003-09-03
Physics
Quantum Physics
1 page, comment on quant-ph/0309015
Scientific paper
A recent paper claimed to give an entanglement measure for composite systems, including Bose condensation and superconductivity. It is not an entanglement measure. It does not distinguish entanglement and non-factorization merely due to (anti)symmetrization for identical particles. In fact, the nature of entanglement, beyond the effect of (anti)symmetrization, in important states of many identical particles such as Bose condensation and superconductivity, had already been studied earlier.
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