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FM: Fall Meeting

FM 39: Quantum Computation: Hardware Platforms II

FM 39.2: Talk

Dienstag, 24. September 2019, 14:30–14:45, 3044

Fast control of quantum circuits — •Jan Goetz^1,2, Kuan Tan^1,2, Vasilii Sevriuk¹, Eric Hyyppä¹, Matti Silveri¹, Matti Partanen¹, Mate Jenei¹, Joni Ikonen¹, Visa Vesterinen³, Leif Grönberg³, Juha Hassel³, and Mikko Möttönen^1,2,3 — ¹IQM, Vaisalantie 6C, 02130 Espoo, Finland — ²QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, PO Box 13500, FI-00076 Aalto, Finland — ³VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044, Espoo, Finland

We report on a fast in-situ control of superconducting quantum circuits. Namely, the fast tunability of an electromagnetic environment coupled to a superconducting resonator and a novel fast readout scheme for superconducting qubits. As tunable environment, we utilize a recently-developed quantum-circuit refrigerator (QCR) to experimentally demonstrate a dynamic tunability in the total damping rate of the resonator up to a factor of 30, with a consequently theoretically predicted change in the internal damping rate by four orders of magnitude. For the fast qubit readout, we experimentally implement a method of measuring a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. Our experiments pave the way towards significant speedup in two relevant operations of a superconducting quantum computer, qubit reset and readout.