SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 3: Quantum Computing and Simulation (joint session Q/QI)

Q 3.2: Talk

Monday, March 6, 2023, 11:15–11:30, E214

Effects of particle losses in two photon quantum walks — •Federico Pegoraro, Philip Held, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS) Warburger Str. 100, 33098, Paderborn, Germany

In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. A considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, with this contribution we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical model that we have devised in order to model controlled particle losses, we describe a platform capable of implementing our theory and in the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties.