Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
Quantum Physics
2016-01-20 v2 Superconductivity
Abstract
Leakage errors occur when a quantum system leaves the two-level qubit subspace. Reducing these errors is critically important for quantum error correction to be viable. To quantify leakage errors, we use randomized benchmarking in conjunction with measurement of the leakage population. We characterize single qubit gates in a superconducting qubit, and by refining our use of Derivative Reduction by Adiabatic Gate (DRAG) pulse shaping along with detuning of the pulses, we obtain gate errors consistently below and leakage rates at the level. With the control optimized, we find that a significant portion of the remaining leakage is due to incoherent heating of the qubit.
Cite
@article{arxiv.1509.05470,
title = {Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit},
author = {Zijun Chen and Julian Kelly and Chris Quintana and R. Barends and B. Campbell and Yu Chen and B. Chiaro and A. Dunsworth and A. Fowler and E. Lucero and E. Jeffrey and A. Megrant and J. Mutus and M. Neeley and C. Neill and P. J. J. O'Malley and P. Roushan and D. Sank and A. Vainsencher and J. Wenner and T. C. White and A. N. Korotkov and John M. Martinis},
journal= {arXiv preprint arXiv:1509.05470},
year = {2016}
}
Comments
10 pages, 10 figures including supplement; fixed typos in metadata