David McKay, R.K. Naik, et al.
Physical Review Letters
Using a circuit QED device, we demonstrate a simple qubit-measurement pulse shape that yields fast ring-up and ring-down of the readout resonator regardless of the qubit state. The pulse differs from a square pulse only by the inclusion of additional constant-amplitude segments designed to effect a rapid transition from one steady-state population to another. Using a Ramsey experiment performed shortly after the measurement pulse to quantify the residual population, we find that compared to a square pulse followed by a delay, this pulse shape reduces the time scale for cavity ring-down by more than twice the cavity time constant. At low drive powers, this performance is achieved using pulse parameters calculated from a linear cavity model; at higher powers, empirical optimization of the pulse parameters leads to similar performance.
David McKay, R.K. Naik, et al.
Physical Review Letters
Ryan Schilling, Chi Xiong, et al.
Optica
Nicholas T. Bronn, Baleegh Abdo, et al.
WOLTE 2016
Jay M. Gambetta, Conal E. Murray, et al.
IEEE TAS