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Q: Fachverband Quantenoptik und Photonik

Q 23: Quantum Information I

Q 23.13: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

A quantum logic gate on remote matter qubits — Severin Daiss, Stefan Langenfeld, Stephan Welte, Emanuele Distante, Philip Thomas, Lukas Hartung, •Olivier Morin, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching

Most quantum computing systems are currently developed in monolithic hardware architecture e.g. ions in the same trap, superconducting qubits on the same chip, Rydberg atoms in the same vacuum chamber etc. However, on the long run, a modular architecture offers a more obvious scalability when large number of qubits is required, leading to the so-called distributed quantum computing. This can typically be achieved by single qubit modules interconnected via photonic qubits travelling through a network of regular optical fibers.

Here, we present the realization of the proof of principle of this vision [1]. Our qubit modules consist of single atoms of ⁸⁷Rb coupled to high finesse optical cavities. While local quantum gates can easily be realized with local Raman or microwave manipulations, we show that a two-qubit gate can be mediated by a single photon successively reflected on the two cavities [2], the interface of our qubit modules. Hence, we realized a CNOT gate on two atomic qubits separated by a 60m-long optical fiber.

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

[2] L.-M. Duan et al., Phys. Rev. A 72, 032333 (2005)