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

Jonas Bylander (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Physical Review Applied (2331-7019). Vol. 3 (2015), p. 034004.
[Artikel, refereegranskad vetenskaplig]

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%.

Nyckelord: superconducting qubits, quantum control

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Denna post skapades 2015-03-13. Senast ändrad 2016-09-27.
CPL Pubid: 213776


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