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FM: Fall Meeting

FM 78: Quantum Computation: Hardware Platform III

FM 78.1: Invited Talk

Donnerstag, 26. September 2019, 14:00–14:30, 1199

Quantum Information Processing using Trapped Atomic Ions and MAGIC — Theeraphot Sriarunothai¹, Sabine Wölk⁴, Gouri S. Giri⁵, Nicolai Friis², Vedran Dunjko³, Hans J. Briegel⁴, Patrick Barthel¹, Patrick Huber¹, and •Christof Wunderlich¹ — ¹Siegen University, Germany — ²Austrian Academy of Sciences, Vienna, Austria — ³Leiden University, Netherlands — ⁴Innsbruck University, Austria — ⁵Düsseldorf University, Germany

Using ion traps that allow for long-range magnetic gradient induced coupling (MAGIC) [1], laser light can be replaced by long-wavelength radiation in the radio-frequency (RF) regime, thus facilitating scalability.

Using a freely programmable quantum computer (QC) based on MAGIC, we report on a proof-of-principle experimental demonstration of the deliberation process in the framework of reinforcement learning [2]. This experiment at the boundary between quantum information science and machine learning shows that decision making for reinforcement learning is sped up quadratically on a QC as compared to a classical agent.

Then we report on 2-qubit RF gates that are robust against variations in the secular trap frequency and Rabi frequency. In future traps such gates will increase speed and fidelity of multi-qubit gates.

[1] C. Piltz et al.,Science Advances 2, e1600093 (2016).

[2] Th. Sriarunothai et al., Quantum Sci. Technol.4, 015014 (2019).