Experimental observation of N00N state Bloch oscillations

Maxime Lebugle, Markus Gräfe, René Heilmann, Armando Perez-Leija, Stefan Nolte and Alexander Szameit ()
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Maxime Lebugle: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena
Markus Gräfe: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena
René Heilmann: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena
Armando Perez-Leija: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena
Stefan Nolte: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena
Alexander Szameit: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Bloch oscillations of quantum particles manifest themselves as periodic spreading and relocalization of the associated wave functions when traversing lattice potentials subject to external gradient forces. Albeit this phenomenon is deeply rooted into the very foundations of quantum mechanics, all experimental observations so far have only contemplated dynamics of one and two particles initially prepared in separable local states. Evidently, a more general description of genuinely quantum Bloch oscillations will be achieved on excitation of a Bloch oscillator by nonlocal states. Here we report the observation of Bloch oscillations of two-particle N00N states, and discuss the nonlocality on the ground of Bell-like inequalities. The time evolution of two-photon N00N states in Bloch oscillators, whether symmetric, antisymmetric or partially symmetric, reveals transitions from particle antibunching to bunching. Consequently, the initial states can be tailored to produce spatial correlations akin to those of bosons, fermions and anyons, presenting potential applications in photonic quantum simulation.

Date: 2015
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DOI: 10.1038/ncomms9273

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