Experimental determination of entanglement with a single measurement

S. P. Walborn (), P. H. Souto Ribeiro, L. Davidovich, F. Mintert and A. Buchleitner
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S. P. Walborn: Universidade Federal do Rio de Janeiro
P. H. Souto Ribeiro: Universidade Federal do Rio de Janeiro
L. Davidovich: Universidade Federal do Rio de Janeiro
F. Mintert: Universidade Federal do Rio de Janeiro
A. Buchleitner: Max-Planck-Institut für Physik komplexer Systeme

Nature, 2006, vol. 440, issue 7087, 1022-1024

Abstract: Measure for measure Quantum entanglement, in which objects stay separated in space but share a quantum state, is a vital resource for quantum information applications, and arguably the most astonishing difference between the classical and quantum worlds. Notable advances have been achieved in both the mathematical description of entanglement and in its creation, but it remains extremely difficult to quantify the experimentally prepared degree of entanglement. So a new, direct way of measuring entanglement, reported this week, is an important development. It measures bipartite entanglement of photons in a one-step procedure in a relatively simple linear optics setup.

Date: 2006
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DOI: 10.1038/nature04627

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