Freiburg 2019 – wissenschaftliches Programm
FM 84.3: Poster
Donnerstag, 26. September 2019, 16:30–18:30, Tents
Quantum Memory with Optimal Control — •Stephan Trattnig1,2, Edwar Xie1,2,3, Frank Deppe1,2,3,4, Qi-ming Chen1,2, Michael Fischer1,2,3, Michael Renger1,2, Stefan Pogorzalek1,2, Kirill G. Fedorov1,2, Matti Partanen1, Achim Marx1, and Rudolf Gross1,2,3,4 — 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 . 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).  E. Xie et al., Appl. Phys. Lett. 112, 202601 (2018).