Z-Gate Operation on a Superconducting Flux Qubit via Its Readout SQUID
Name
PhysRevApplied.3.034004.pdf
Size
335.02 KB
Format
Adobe PDF
Checksum (MD5)
5d27355a0f88b7bec1a5583aa4c42e41
Author(s)
Jin, X. Y.
Bylander, Jonas
Yoshihara, F.
Nakamura, Yasunobu
Gustavsson, Simon
Yan, Fei
Orlando, Terry Philip
Oliver, William D.
Date Issued
March 2015
Journal
Physical Review Applied
Publisher
American Physical Society
Citation
Jin, X. Y. et al. “Z-Gate Operation on a Superconducting Flux Qubit via Its Readout SQUID.” Physical Review Applied 3.3 (2015). © 2015 American Physical Society
Version
Final published version
Abstract
Detuning a superconducting qubit from its rotating frame is one means to implement a Z-gate operation. In this work, we implement a Z gate by pulsing a current through the qubit’s readout dc SQUID. While the dc SQUID acts as a magnetic flux sensor for qubit readout, we in turn may use it as a flux actuator with tunable strength to impose a qubit frequency shift. Using this approach, we demonstrate Ramsey-type free-induction experiments with time constants as long as 280 ns and rotation frequencies as high as 1.4 GHz. We experimentally demonstrate an inferred Z-gate fidelity of approximately 90%, limited largely by the bandwidth of our system. In the absence of this limitation, we argue that the inferred fidelity may be improved to as high as 99%.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevApplied.3.034004
