Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 2 (joint session TT/HL)
TT 52.5: Talk
Thursday, March 19, 2020, 10:30–10:45, HSZ 03
Optimal control of a compact 3D quantum memory — Julia Lamprich1,2, Stephan Trattnig1,2, •Yuki Nojiri1,2,3, Qiming Chen1,2,3, Stephan Pogozarek1,2, Michael Renger1,2,3, Kirill Fedorov1,2,3, Achim Marx1,3, Matti Partanen1,3, Frank Deppe1,2,3, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meißner-Strasse 8, D-85748 Garching, Germany — 2Physik-Department, Technische Universität München, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany
Quantum memories are of high relevance in the context of quantum computing and communication. For building scalable architectures based on superconducting quantum circuits, 3D cavities are promising candidates for a quantum memory. Recently, a compact layout exploiting the multimode structure of a rectangular 3D cavity has been demonstrated [1]. In that work, the fidelity of the transfer process was also limited by state leakage. This can be overcome by pulse shaping using optimal control strategies [2]. Henceforth, we implement a search algorithm (CMA-ES) to find optimized pulses promising higher gate fidelities, and present first experimental results.
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).
[2] Shai Machnes et al., Phys. Rev. Lett. 120, 150401 (2018)