Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session R08: Advances in Qubit Measurement I
8:00 AM–11:00 AM,
Thursday, March 5, 2020
Room: 104
Sponsoring
Unit:
DQI
Chair: Luke Govia, BBN Technology - Massachusetts
Abstract: R08.00003 : Measurement of quantum jumps of a fluxonium qubit using a Dimer Josephson Junction Array Amplifier operated at high power
Presenter:
Ivan Takmakov
(Karlsruhe Institute of Technology)
Authors:
Ivan Takmakov
(Karlsruhe Institute of Technology)
Patrick Winkel
(Karlsruhe Institute of Technology)
Farshad Foroughi
(NEEL)
Martin Spiecker
(Karlsruhe Institute of Technology)
Lukas Gruenhaupt
(Karlsruhe Institute of Technology)
Daria Gusenkova
(Karlsruhe Institute of Technology)
Luca Planat
(NEEL)
Dennis Rieger
(Karlsruhe Institute of Technology)
Alexey V. Ustinov
(Karlsruhe Institute of Technology)
Wolfgang Wernsdorfer
(Karlsruhe Institute of Technology)
Ioan-Mihai Pop
(Karlsruhe Institute of Technology)
Nicolas Roch
(NEEL)
We demonstrate high saturation power in a Dimer Josephson Junction Array Amplifier [4] operating with a quantum efficiency of 60%. We use this parametric amplifier to perform dispersive readout of a fluxonium qubit with a superinductor made of granular aluminum [5]. We present quantum jump measurements acquired using up-to 100 circulating photons in the readout resonator, which allowed qubit state discrimination in tens of nanoseconds.
[1] C. Eichler and A. Wallraff, EPJ Quantum Technologies 1, 2 (2014)
[2] L. Planat et.al., PRA 11, 034014 (2019)
[3] V. V. Sivak et.al., arxiv:1909.08005
[4] P. Winkel & I. Takmakov et.al., arxiv:1909.08037
[5] L. Grünhaupt & M. Spiecker, et al. Nature Materials 18, 816–819 (2019)
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