Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 40: Poster: Quantum Computation: Hardware Platforms

FM 40.10: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Time-resolved tomography of a compact 3D quantum memory — •Michael Renger1,2, Edwar Xie1,2,3, Frank Deppe1,2,3, Qi-Ming Chen1,2, Stefan Pogorzalek1,2, Kirill G. Fedorov1,2, Matti Partanen1, Achim Marx1, and Rudolf Gross1,2,31Walther- Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, 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 single resonator for storage and readout purposes, thereby significantly enhancing scalability. Compared to the bare qubit, the T1-time of the memory is 6 times longer. 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 process fidelity of 88%. A detailed error budget analysis enables us to estimate the fidelity losses caused by decoherence, thermal excitations, state leakage and inaccurate state preparation. We investigate the dynamical behavior of our system with time-resolved tomography and a master equation approach.

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).

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