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QI: Fachverband Quanteninformation

QI 8: Quantum Communication I (joint session Q/QI)

QI 8.3: Vortrag

Montag, 6. März 2023, 17:30–17:45, F442

Atomic arrays based on optical tweezers at the center of an optical cavity — •Lukas Hartung, Matthias Seubert, Stephan Welte, Emanuele Distante, and Gerhard Rempe — Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Str.1, 85748 Garching

Future quantum networks require multi-qubit network nodes that are capable to manipulate and process quantum information locally and distribute entanglement over the entire network. Therefore, a variety of fundamental qubit-operations and quantum gates are necessary and were already demonstrated, e.g. single qubit-rotations, local [1] and remote qubit-gates [2] and efficient atom-photon entanglement [3]. However, scaling up to many qubits at one node remains an outstanding challenge.

In this talk, we present the generation of arrays of rubidium 87 atoms in an optical cavity. The atoms are loaded and trapped in an optical lattice probabilistically and are then rearranged within the lattice with the help of optical tweezers. In this way, we increase the rate of generation of atomic arrays by orders of magnitudes and, in principle, preserve the capabilities already demonstrated in the past.

[1] Welte, Stephan, et al., Photon-Mediated Quantum Gate between Two Neutral Atoms in an Optical Cavity, Phys. Rev. X 8, 011018 (2018)

[2] Daiss, Severin, et al., A quantum-logic gate between distant quantum-network modules, Science 371, 614 (2021)

[3] Thomas, Philip, et al., Efficient generation of entangled multiphoton graph states from a single atom, Nature 608, 677-681 (2022)