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Experimental determination of entanglement with a single measurement

Souto Ribeiro, P. H ; Buchleitner, A ; Davidovich, L ; Mintert, F ; Walborn, S. P

Nature, 2006-04, Vol.440 (7087), p.1022-1024 [Periódico revisado por pares]

London: Nature Publishing

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Título:
Experimental determination of entanglement with a single measurement
Autor: Souto Ribeiro, P. H ; Buchleitner, A ; Davidovich, L ; Mintert, F ; Walborn, S. P
Assuntos: Atoms & subatomic particles ; Classical and quantum physics: mechanics and fields ; Exact sciences and technology ; Experiments ; Fundamental areas of phenomenology (including applications) ; Nonclassical field states; squeezed, antibunched and sub-poissonian states; operational definitions of the phase of the field; phase measurements ; Optics ; Physics ; Quantum information ; Quantum optics ; Quantum theory
É parte de: Nature, 2006-04, Vol.440 (7087), p.1022-1024
Notas: ObjectType-Article-2
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Descrição: Nearly all protocols requiring shared quantum information—such as quantum teleportation or key distribution—rely on entanglement between distant parties. However, entanglement is difficult to characterize experimentally. All existing techniques for doing so, including entanglement witnesses or Bell inequalities, disclose the entanglement of some quantum states but fail for other states; therefore, they cannot provide satisfactory results in general. Such methods are fundamentally different from entanglement measures that, by definition, quantify the amount of entanglement in any state. However, these measures suffer from the severe disadvantage that they typically are not directly accessible in laboratory experiments. Here we report a linear optics experiment in which we directly observe a pure-state entanglement measure, namely concurrence. Our measurement set-up includes two copies of a quantum state: these ‘twin’ states are prepared in the polarization and momentum degrees of freedom of two photons, and concurrence is measured with a single, local measurement on just one of the photons.
Editor: London: Nature Publishing
Idioma: Inglês

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Experimental determination of entanglement with a single measurement

Souto Ribeiro, P. H ; Buchleitner, A ; Davidovich, L ; Mintert, F ; Walborn, S. P

London: Nature Publishing

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