Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Computing and Simulation II

Q 68.1: Talk

Friday, March 15, 2024, 14:30–14:45, HS 1199

Single atoms in a cavity: a platform for photonic graph states generation — Philip Thomas, Leonardo Ruscio, •Olivier Morin, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching

Photonic graph states are powerful resources for numerous quantum information applications, from pure quantum computation, with so-called measurement based quantum computing (MBQC), to the one-way quantum repeater for quantum communication. However, generating graph states experimentally is a tremendous challenge. The cavity QED toolbox offers all that is needed to efficiently generate graph states. Using a single atom in an optical cavity we have shown the generation record-size Greenberger-Horne-Zeilinger (GHZ) states and linear cluster states [1]. With only one photon emitter, the type of graph states one can generate remains limited though. Hence, to go beyond, we show that elementary graph states – generated by two independent atoms – can be fused into more complex graph states, such as ring states, used for error correction, and tree states for the one-way quantum repeater [2]. This concept can be extended to an even larger number of atoms, providing a universal platform. Hence, these demonstrations are moving forward the potential of graph states for realistic applications in quantum information.

[1] P. Thomas et al., Nature 608, 677-681 (2022).

[2] P. Thomas et al., Under review (2024).

Keywords: photon; atoms; CQED; graph state