Robustness of error-suppressing entangling gates in cavity-coupled transmon qubits

Xiu-Hao Deng, Edwin Barnes, and Sophia E. Economou
Phys. Rev. B 96, 035441 – Published 27 July 2017

Abstract

Superconducting transmon qubits comprise one of the most promising platforms for quantum information processing due to their long coherence times and to their scalability into larger qubit networks. However, their weakly anharmonic spectrum leads to spectral crowding in multiqubit systems, making it challenging to implement fast, high-fidelity gates while avoiding leakage errors. To address this challenge, we use a protocol for speeding up waveforms by inducing phases to harmful transitions (SWIPHT) [S. E. Economou and E. Barnes, Phys. Rev. B 91, 161405(R) (2015)], which yields smooth, simple microwave pulses designed to suppress leakage without sacrificing gate speed through spectral selectivity. Here, we determine the parameter regimes in which SWIPHT is effective and demonstrate that in these regimes, it systematically produces two-qubit gate fidelities for cavity-coupled transmons in the range 99.6%–99.9% with gate times as fast as 23 ns. Our results are obtained from full numerical simulations that include current experimental levels of relaxation and dephasing. These high fidelities persist over a wide range of system parameters that encompass many current experimental setups and are insensitive to small parameter variations and pulse imperfections.

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  • Received 30 March 2017
  • Revised 5 June 2017

DOI:https://doi.org/10.1103/PhysRevB.96.035441

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiu-Hao Deng, Edwin Barnes, and Sophia E. Economou*

  • Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA

  • *economou@vt.edu

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Issue

Vol. 96, Iss. 3 — 15 July 2017

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