Fast pulse sequences for dynamically corrected gates in singlet-triplet qubits

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Robert E. Throckmorton
  • Xu-Chen Yang
  • Edwin Barnes
  • S. Das Sarma

Detail(s)

Original languageEnglish
Article number195424
Journal / PublicationPhysical Review B
Volume96
Issue number19
Publication statusPublished - 15 Nov 2017

Abstract

We present a set of experimentally feasible pulse sequences that implement any single-qubit gate on a singlet-triplet spin qubit and demonstrate that these new sequences are up to three times faster than existing sequences in the literature. We show that these sequences can be extended to incorporate built-in dynamical error correction, yielding gates that are robust to both charge and magnetic field noise and up to twice as fast as previous dynamically corrected gate schemes. We present a thorough comparison of the performance of our new sequences with that of several existing ones using randomized benchmarking, considering both quasistatic and 1/fα noise models. We provide our results both as a function of evolution time and as a function of the number of gates, which respectively yield both an effective coherence time and an estimate of the number of gates that can be performed within this coherence time. We determine which set of pulse sequences gives the best results for a wide range of noise strengths and power spectra. Overall, we find that the traditional, slower sequences perform best when there is no field noise or when the noise contains significant high-frequency components; otherwise, our new, fast sequences exhibit the best performance.

Citation Format(s)

Fast pulse sequences for dynamically corrected gates in singlet-triplet qubits. / Throckmorton, Robert E.; Zhang, Chengxian; Yang, Xu-Chen; Wang, Xin; Barnes, Edwin; Das Sarma, S.

In: Physical Review B, Vol. 96, No. 19, 195424, 15.11.2017.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review