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Q: Fachverband Quantenoptik und Photonik

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

Q 3.4: Vortrag

Montag, 6. März 2023, 11:45–12:00, E214

Multiphoton entangled graph states from a single atom — •Philip Thomas, Leonardo Ruscio, Olivier Morin, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching

Optical photons interact very weakly with their environment, making them robust qubit carriers suitable for numerous protocols in quantum information science. Many experiments on photonic entanglement that were carried out over the last decades relied on the well-established toolbox of non-linear optics. However, the underlying process is intrinsically probabilistic and thus poses a practical limit on the size of entangled states one can generate. In order to avoid this obstacle, we use a single Rubidium atom in an optical cavity as an efficient photon source [1]. Single photons are emitted sequentially while the atomic spin qubit mediates entanglement between them. We show that by tailored single-qubit operations on the atomic state we generate Greenberger-Horne-Zeilinger (GHZ) states of up to 14 photons and linear cluster states of up to 12 photons. A combined source-to-detection efficiency of 43% leads to coincidence rates orders of magnitude higher than the previous state-of-the-art [2]. Our work represents a step towards scalable measurement-based quantum computing and communication.

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

[2] H.-S. Zhong et al., Phys. Rev. Lett. 121, 250505 (2018).