Srikanth J. Srinivasan, Anthony J. Hoffman, et al.
QELS 2012
We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by 6.5 dB in a 20 MHz window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of 91.9% with a measurement time of Tmeas = 200 ns. Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of 94.3%.
Srikanth J. Srinivasan, Anthony J. Hoffman, et al.
QELS 2012
K.X. Wei, Easwar Magesan, et al.
Physical Review Letters
Srikanth J. Srinivasan, Anthony J. Hoffman, et al.
CLEO 2012
Anthony J. Hoffman, Srikanth J. Srinivasan, et al.
Physical Review B - CMMP