Increasing identical particle entanglement by fuzzy measurements

Details Increasing identical particle entanglement by fuzzy measurements Increasing identical particle entanglement by fuzzy measurements

2005-05-05

arxiv.org/abs/quant-ph/0505029v2

Phys. Rev. A 72, 062307 (2005)

Physics

Quantum Physics

5 pages, 2 figures. V2: Appendix added. Minor corrections

Scientific paper

10.1103/PhysRevA.72.062307

We investigate the effects of fuzzy measurements on spin entanglement for identical particles, both fermions and bosons. We first consider an ideal measurement apparatus and define operators that detect the symmetry of the spatial and spin part of the density matrix as a function of particle distance. Then, moving on to realistic devices that can only detect the position of the particle to within a certain spread, it was surprisingly found that the entanglement between particles increases with the broadening of detection.

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