Nikolaj Moll, Panagiotis Kl. Barkoutsos, et al.
Quantum Science and Technology
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.
Nikolaj Moll, Panagiotis Kl. Barkoutsos, et al.
Quantum Science and Technology
Matthew Reagor, Hanhee Paik, et al.
Applied Physics Letters
Sarah Sheldon, Martin Sandberg, et al.
Applied Physics Letters
Nicholas T. Bronn, Baleegh Abdo, et al.
WOLTE 2016