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Z-Gate Operation on a Superconducting Flux Qubit via its Readout SQUID
- Source :
- Physical Review Applied. 3
- Publication Year :
- 2015
- Publisher :
- American Physical Society (APS), 2015.
-
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%.
Details
- ISSN :
- 23317019
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Physical Review Applied
- Accession number :
- edsair.doi...........a71ff67cab288b33e48fb08b894bcabe