Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantum Information (Quantum Repeater)

Q 47.3: Vortrag

Mittwoch, 7. März 2018, 14:45–15:00, K 1.020

A Gate between Two Matter Qubits Using Cavity QED — •Severin Daiss, Stephan Welte, Bastian Hacker, Lin Li, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Cavity QED systems have been established as an ideal interface to connect flying and stationary qubits in a future quantum network. Exchange of photons between the resonator-based network nodes enables the distribution of quantum states and the generation of remote entanglement [1]. To build a scalable network architecture, each node is required to contain several qubits that are connected by quantum gate operations. To this end, we have trapped two neutral atoms inside an optical cavity so that they are both strongly coupled to light impinging onto the resonator [2]. In this setup, we realize a quantum gate between two atomic qubits by reflecting an optical photon that arrives via the network channel. We show the functionality of our gate as a CNOT and demonstrate its entangling capabilities on the two atoms. The presented mechanism offers perspectives towards one-step many-atom gates or hybrid gates between several atoms and a network photon.

[1] A. Reiserer, G. Rempe, Rev. Mod. Phys. 87, 1379 (2015).

[2] S. Welte, B. Hacker, S. Daiss, S. Ritter, G. Rempe, Phys. Rev. Lett. 118, 210503 (2017).