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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.3: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Quantum Memory with Optimal Control — •Stephan Trattnig^1,2, Edwar Xie^1,2,3, Frank Deppe^1,2,3,4, Qi-ming Chen^1,2, Michael Fischer^1,2,3, Michael Renger^1,2, Stefan Pogorzalek^1,2, Kirill G. Fedorov^1,2, Matti Partanen¹, Achim Marx¹, and Rudolf Gross^1,2,3,4 — ¹Walther- Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik Department, TU München, 85748 Garching, Germany — ³Nanosystems Initiative Munich (NIM), 80799 München, Germany — ⁴Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany

We realize a quantum memory by coupling a transmon qubit to a rectangular 3D cavity resonator [1]. Exploiting the multimode structure of the 3D cavity enables us to use a single resonator for storage and readout purposes, thereby significantly enhancing scalability. We accurately characterize the loss of quantum information during the storage and retrieval process by performing quantum process tomography on our memory system and find a corrected process fidelity of 88%. Finally, we employ optimal control with DRAG-like pulses in an attempt to suppress state leakage and, thus, improve our memory protocol.

We acknowledge support by the Germany’s Excellence Strategy EXC-2111-390814868, Elite Network of Bavaria through the program ExQM, and the European Union via the Quantum Flagship project QMiCS (Grant No. 820505). [1] E. Xie et al., Appl. Phys. Lett. 112, 202601 (2018).