Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Computing and Simulation II

Q 68.3: Vortrag

Freitag, 15. März 2024, 15:00–15:15, HS 1199

Entanglement Transfer Properties in Time-Multiplexed Discrete-Time Quantum Walks — •Jonas Lammers, Federico Pegoraro, Philip Held, Nidhin Prasannan, Fabian Schlue, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

Entanglement, as it arises from quantum mechanics, is a powerful resource underlying many protocols demonstrating quantum advantage. Interestingly, the inseparability of multiple degrees of freedom underlying entanglement has a classical analog exhibited for example by coherent laser light. As this classical inseparability (aka. modal entanglement) cannot be used to violate local realism, it has a controversial role in the field of quantum information science. In this work, we contribute to this discussion by studying how modal entanglement interacts with quantum entanglement between two photons when subjecting one photon to a quantum walk evolution. For this purpose we generate two polarization entangled photons. One of which we send to a free-space time-multiplexed discrete-time quantum walk (QW). Here we investigate how the modal entanglement generated via the QW transfers multi-particle entanglement from the initial polarization-polarization towards the position-polarization encoding spanning both photons. For this purpose, we perform two photon polarization tomography at each individual position of the QW. We further developed an original measure which reveals signatures of multi-particle entanglement in conditioned position distributions.

Keywords: Entanglement Transfer; Entanglement Verification; Time-Multiplexing; Quantum Walks