Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Information (Quantum Communication) II

Q 35.5: Vortrag

Mittwoch, 16. März 2022, 15:00–15:15, Q-H12

Quantum network with interacting network qubits — •Emanuele Distante, Severin Daiss, Stefan Langenfeld, Stephan Welte, Philip Thomas, Lukas Hartung, Olivier Morin, and Gerhard Rempe — Max Planck Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

Quantum networks allow the realization of distributed architectures where local network modules, containing addressable memory qubits and linked together via photonic channels, operate as distributed quantum machine. Such architecture represents a promising route to scale up the number of cross-talk free qubits in a quantum computer. Its realization, however, requires strong, controllable interactions among stationary qubits located in different network modules. Here, we report on our progress on the realization of an elementary network link where the interaction among qubits located in separated modules is mediated by traveling photonic qubits. Each module is based on a single ⁸⁷Rb atom trapped at the center of an optical cavity. We will show that single photons sequentially reflected off the modules mediate strong interaction between the network qubits allowing the realization of fundamental logic-gate between the remotely located qubits, the faithful transfer of information via a simple/novel teleportation scheme, as well as realization of joint nondestructive measurement on distant qubits.

[1] S. Daiss et al., Science 371, 614-617 (2021)

[2] S. Langenfeld et al., Phys. Rev. Lett. 126, 130502 (2021)

[3] S. Welte et al., Nat. Phot. 15, 504-509 (2021)