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Efficient Stabilized Two-Qubit Gates on a Trapped-Ion Quantum Computer

TitleEfficient Stabilized Two-Qubit Gates on a Trapped-Ion Quantum Computer
Publication TypeJournal Article
Year of Publication2021
AuthorsR. Blumel, N. Grzesiak, N. H. Nguyen, A. M. Green, M. Li, A. Maksymov, ii, N. M. Linke, and Y. Nam
JournalPhys. Rev. Lett.
Volume126
Date PublishedJUN 4
Type of ArticleArticle
ISSN0031-9007
Abstract

In order to scale up quantum processors and achieve a quantum advantage, it is crucial to economize on the power requirement of two-qubit gates, make them robust to drift in experimental parameters, and shorten the gate times. Applicable to all quantum computer architectures whose two-qubit gates rely on phase-space closure, we present here a new gate-optimizing principle according to which negligible amounts of gate fidelity are traded for substantial savings in power, which, in turn, can be traded for substantial increases in gate speed and/or qubit connectivity. As a concrete example, we illustrate the method by constructing optimal pulses for entangling gates on a pair of ions within a trapped-ion chain, one of the leading quantum computing architectures. Our method is direct, noniterative, and linear, and, in some parameter regimes, constructs gate-steering pulses requiring up to an order of magnitude less power than the standard method. Additionally, our method provides increased robustness to mode drift. We verify the new trade-off principle experimentally on our trapped-ion quantum computer.

DOI10.1103/PhysRevLett.126.220503