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Direct Measurement of a Nonlocal Entangled Quantum State.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Direct Measurement of a Nonlocal Entangled Quantum State."

Entanglement and the wave function description are two of the core concepts that make quantum mechanics such a unique theory. A method to directly measure the wave function, using weak values, was demonstrated by Lundeen et al. [Nature 474, 188 (2011)]. However, it is not applicable to a scenario of two disjoint systems, where nonlocal entanglement can be a crucial element, since that requires obtaining weak values of nonlocal observables. Here, for the first time, we propose a method to directly measure a nonlocal wave function of a bipartite system, using modular values. The method is experimentally implemented for a photon pair in a hyperentangled state, i.e., entangled both in polarization and momentum degrees of freedom.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 150402

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