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Trapped Ion Quantum Computing Superconducting Qubits

Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit

arXiv

Authors: Zijun Chen, Julian Kelly, Chris Quintana, R. Barends, B. Campbell, Yu Chen, B. Chiaro, A. Dunsworth, A. Fowler, E. Lucero, E. Jeffrey, A. Megrant, J. Mutus, M. Neeley, C. Neill, P. J. J. O'Malley, P. Roushan, D. Sank, A. Vainsencher, J. Wenner, T. C. White, A. N. Korotkov, John M. Martinis

Year

2015

Paper ID

27179

Status

Preprint

Abstract Read

~2 min

Abstract Words

106

Citations

N/A

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 10^-3 and leakage rates at the 10^-5 level. With the control optimized, we find that a significant portion of the remaining leakage is due to incoherent heating of the qubit.

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This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
It adds a 2015 reference point for readers tracking recent quantum research.
Leakage errors occur when a quantum system leaves the two-level qubit subspace.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1509.05470 [2] arXiv https://arxiv.org/abs/1509.05470 [3] Publisher https://arxiv.org/abs/1509.05470

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