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Z-Gate Operation on a Superconducting Flux Qubit via Its Readout SQUID

Author(s)
Jin, X. Y.; Bylander, Jonas; Yoshihara, F.; Nakamura, Yasunobu; Gustavsson, Simon; Yan, Fei; Orlando, Terry Philip; Oliver, William D.; ... Show more Show less
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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%.
Date issued
2015-03
URI
http://hdl.handle.net/1721.1/96056
Department
Lincoln Laboratory; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
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
ISSN
2331-7019

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