Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.30: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
Creation of optical coherent state superpositions with full parameter control — Hacker Bastian1, Welte Stephan1, Daiss Severin1, •Hartung Lukas1, Shaukat Armin1, Stephan Ritter1,2, Lin Li1,3, and Gerhard Rempe1 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2Present address: TOPTICA Photonics AG, Lochhamer Schlag 19, 82166 Gräfelfing, Germany — 3Present address: Huazhong University of Science and Technology, Wuhan 430074, China
Coherent state superpositions (CSS) promise to be useful tools for communication in quantum networks. They offer the possibility to encode qubits in flying continuous-variable states and to implement error correction codes as already demonstrated for superconducting circuits 1. Here, we demonstrate the creation of CSS in the optical regime using a strongly coupled atom–cavity system. We have full control over all degrees of freedom, such as the optical phase or the population fractions of the contributing states. As a first application we implement a universal quantum-logic gate between such continuous-variables states and the spin of a single atom trapped in an optical cavity, showing the usefulness of CSS in the context of interfacing flying and stationary qubits.
1 N. Ofek, Nature 536, 441-445 (2016)
2 B. Wang and L.-M. Duan, Phys. Rev. A 72, 022320 (2005)