Increasing identical particle entanglement by fuzzy measurements
arXiv:quant-ph/0505029 · doi:10.1103/PhysRevA.72.062307
Abstract
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.
5 pages, 2 figures. V2: Appendix added. Minor corrections
References in corpus (8)
- Separability Criterion for Density Matrices
- A computable measure of entanglement
- Separability of Mixed States: Necessary and Sufficient Conditions
- Entanglement monotones
- Robustness of entanglement
- Multimode Hong-Ou-Mandel interference
- Entanglement in The Second Quantization Formalism
- Entanglement of electron spins of non-interacting electron gases
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