Qubit metrology of ultralow phase noise using randomized benchmarking
Quantum Physics
2016-05-31 v3 Mesoscale and Nanoscale Physics
Superconductivity
Abstract
A precise measurement of dephasing over a range of timescales is critical for improving quantum gates beyond the error correction threshold. We present a metrological tool, based on randomized benchmarking, capable of greatly increasing the precision of Ramsey and spin echo sequences by the repeated but incoherent addition of phase noise. We find our SQUID-based qubit is not limited by flux noise at short timescales, but instead observe a telegraph noise mechanism that is not amenable to study with standard measurement techniques.
Keywords
Cite
@article{arxiv.1411.2613,
title = {Qubit metrology of ultralow phase noise using randomized benchmarking},
author = {P. J. J. O'Malley and J. Kelly and R. Barends and B. Campbell and Y. Chen and Z. Chen and B. Chiaro and A. Dunsworth and A. G. Fowler and I. -C. Hoi and E. Jeffrey and A. Megrant and J. Mutus and C. Neill and C. Quintana and P. Roushan and D. Sank and A. Vainsencher and J. Wenner and T. C. White and A. N. Korotkov and A. N. Cleland and John M. Martinis},
journal= {arXiv preprint arXiv:1411.2613},
year = {2016}
}
Comments
11 pages, 7 figures