Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Effects: Entanglement and Decoherence

Q 34.2: Vortrag

Mittwoch, 8. März 2017, 15:00–15:15, P 4

Observation of genuine three-photon interference — •Thomas Kauten¹, Sascha Agne², Jeongwan Jin², Evan Meyer-Scott^2,3, Jeff Salvail², Deny Hamel⁴, Kevin Resch², Gregor Weihs¹, and Thomas Jennewein² — ¹Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria — ²Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada — ³Department of Physics, University of Paderborn, 33098 Paderborn, Germany — ⁴Département de Physique et d’Astronomie, Université de Moncton, Moncton, New Brunswick E1A 3E9, Canada

Multiparticle quantum interference is important for our understanding and exploitation of quantum information and for fundamental tests of quantum mechanics [1]. An example for multi-partite correlations is the Greenberger-Horne-Zeilinger (GHZ) state [2]. In a GHZ-state, three particles are correlated while no pairwise correlation is found. Those strong correlations have been studied theoretically since 1990 but no three-photon GHZ interferometer has been realized experimentally. Here we demonstrate three-photon interference that does not originate from two-photon or single photon interference. We observe phase-dependent variation of three-photon coincidences with (90.5 ± 5.0)% visibility [3] in a generalized Franson interferometer [4] using energy-time entangled photon triplets [5].

[1] Pan et al., Rev. Mod. Phys. 84, 777 (2012). [2] Greenberger et al., Am. J. Phys. 58, 1131 (1990). [3] Agne et al., arXiv:1609.07508 (2016). [4] Franson Phys. Rev. Lett. 62, 2205 (1989). [5] Hübel et al., Nature 466, 601-603 (2010).