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MON: Monday Contributed Sessions

MON 13: QIP Implementations: Photons II

MON 13.1: Vortrag

Montag, 8. September 2025, 16:30–16:45, ZHG001

Distinguishability, mixedness and symmetry in multiphoton quantum interference — •Shreya Kumar¹, Alex E Jones², Matthias Bayerbach¹, Simone D'Aurelio¹, Nico Hauser¹, and Stefanie Barz¹ — ¹Institute for Functional Matter and Quantum Technologies, and IQST, University of Stuttgart, 70569 Stuttgart, Germany — ²2QET Labs, University of Bristol, Bristol BS8 1FD, UK

Quantum interference is fundamental to many quantum technologies and is governed by properties such as distinguishability, mixedness, and the symmetry of quantum states. Here, we present how these properties influence multiphoton scattering statistics. In particular, we demonstrate that three photons can exhibit distinct scattering statistics depending on whether they are in pure or mixed states, even when they display identical pairwise Hong-Ou-Mandel (HOM) interference. This highlights that pairwise HOM interference is insufficient to fully characterise multi-photon quantum interference. We further investigate the role of quantum state symmetry in quantum interference. Together, these results provide new fundamental insights into the nature of quantum interference and highlight the role of distinguishability, mixedness, and symmetry in multiphoton interference. Apart from providing fundamental insight into the nature of quantum interference, our results have significant implications for quantum technologies that rely on photonic interference, including quantum computing and quantum simulation.

Keywords: Multiphoton; Quantum Interference