Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 36: Quantum Metrology and Interference

Q 36.2: Talk

Wednesday, March 13, 2024, 14:45–15:00, HS 3219

Entanglement-induced collective many-body interference — •Tommaso Faleo¹, Eric Brunner², Jonathan W. Webb³, Alexander Pickston³, Joseph Ho³, Gregor Weihs¹, Andreas Buchleitner^2,4, Christoph Dittel^2,4,5, Gabriel Dufour², Alessandro Fedrizzi³, and Robert Keil¹ — ¹Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria — ²Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany — ³Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK — ⁴EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany — ⁵Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstraße 19, 79104 Freiburg, Germany

Entanglement and interference are hallmark effects of quantum physics, introducing particularly rich dynamics within systems of multiple (at least partially) indistinguishable particles.

By combining entanglement and many-body interference, we propose a novel quantum effect to realize genuine N-particle interference. We experimentally demonstrate this effect in a four-photon interferometer, where a highly visible interference pattern emerges upon the joint detection of all photons, while interference at lower-order particle correlators is strictly suppressed. The observed interference is a function of the four-particle collective phase, a genuine four-body property.

Keywords: Entanglement; Many-body interference; Genuine collective interference; Quantum optics; Photonics