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Article overview
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Experimental implementation of a NMR entanglement witness | | J. G. Filgueiras
; T. O. Maciel
; R. E. Auccaise
; R. O. Vianna
; R. S. Sarthour
; I. S. Oliveira
; | | Date: |
1 Feb 2012 | | Abstract: | Entanglement witnesses (EW) allow the detection of entanglement in a quantum
system, from the measurement of some few observables. They do not require the
complete determination of the quantum state, which is regarded as a main
advantage. On this paper it is experimentally analyzed an entanglement witness
recently proposed in the context of Nuclear Magnetic Resonance (NMR)
experiments to test it in some Bell-diagonal states. We also propose some
optimal entanglement witness for Bell-diagonal states. The efficiency of the
two types of EW’s are compared to a measure of entanglement with tomographic
cost, the generalized robustness of entanglement. It is used a GRAPE algorithm
to produce an entangled state which is out of the detection region of the EW
for Bell-diagonal states. Upon relaxation, the results show that there is a
region in which both EW fails, whereas the generalized robustness still shows
entanglement, but with the entanglement witness proposed here with a better
performance. | | Source: | arXiv, 1202.0235 | | Services: | Forum | Review | PDF | Favorites | |
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