Physics – Quantum Physics
Scientific paper
2010-06-08
Physics
Quantum Physics
Phys. Rev. Lett. 105, 230404 (2010); supplementary information (OWitness_sup.pdf) is included in source zip file
Scientific paper
10.1103/PhysRevLett.105.230404
Whether entanglement in a state can be detected, distilled, and quantified without full state reconstruction is a fundamental open problem. We demonstrate a new scheme encompassing these three tasks for arbitrary two-qubit entanglement, by constructing the optimal entanglement witness for polarization-entangled mixed-state photon pairs without full state reconstruction. With better efficiency than quantum state tomography, the entanglement is maximally distilled by newly developed tunable polarization filters, and quantified by the expectation value of the witness, which equals the concurrence. This scheme is extendible to multiqubit Greenberger-Horne-Zeilinger entanglement.
Choi Sang-Kyung
Kim Hungsoo
Lee S.-S. B.
Park Seong-Hong
Sim Hyung-Seok
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