Exploring the Optimal Sensitivity of Sum-Variance Nonseparability Criteria for Spin-1/2 Systems

Authors

Irfan Ali Khan, University of Rochester
John C. Howell, Chapman UniversityFollow

Document Type

Article

Publication Date

12-28-2004

Abstract

We report on experimental and theoretical studies on recently introduced entanglement measures which use a sum of spin-variance criteria for two spin-1∕2 particles. Three inequalities are explored which exhibit useful concatenating properties. They are each shown to have greater sensitivities than a Bell’s measurement, while each requiring fewer measurements than a Bell’s measurement to obtain. The simplest inequality, requiring just four measurements, is shown to be efficient at testing for entanglement in down-conversion sources which naturally exhibit maximally polarized noise. The most complex inequality, requiring just 12 measurements, is shown to have a sensitivity equal to that of the Peres separability criterion for maximally polarized and Werner noise. This increased sensitivity implies optimality of the measure.

Comments

This article was originally published in Physical Review A, volume 70, issue 6, in 2004. https://doi.org/10.1103/PhysRevA.70.062320

Recommended Citation

I. A. Khan and J. C. Howell, Exploring the Optimal Sensitivity of Sum-Variance Nonseparability Criteria for Spin-1/2 Systems, Phys. Rev. A 70(6), 062320.

Peer Reviewed

1

Copyright

American Physical Society