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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Many-Body Dynamics

Q 20.1: Vortrag

Dienstag, 12. März 2024, 11:00–11:15, HS 3118

Loss-tolerant photonic fusion networks for quantum computing with quantum emitters — •Matthias C. Löbl, Stefano Paesani, and Anders S. Sørensen — Center for Hybrid Quantum Networks (Hy-Q), The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

Graph states are entangled states that enable measurement-based quantum computing, an approach that is particularly promising for architectures using photons as qubits. However, generating the required large photonic graph states is complicated by photon losses and the fact that photon-photon gates are difficult to realize. To generate large graph states, we consider an approach that connects small graph resource states by probabilistic entangling gates (Bell measurements called fusions). To make the scheme practical, we use resource states that are locally equivalent to GHZ states and readily can be generated using quantum emitters. Furthermore, we consider fusion networks where all fusions are performed at once which is advantageous as it minimizes the required adaptiveness and the need for long memory time. We optimize the tolerance to photon loss of several such schemes where either purely photonic graph states or spin-photon entangled states are used. The latter approach is particularly suited for quantum emitters with a spin degree of freedom and we find a tolerance to photon loss of more than 6% for such architectures [1]. Finally, we also discuss algorithms to simulate the photon loss threshold as a non-standard percolation model.

[1] Matthias C. Löbl et a., arxiv:2304.03796 (2023)

Keywords: graph state; photon; quantum computing; fusion; spin