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DOE OSTI · 2446951

Syncopated dynamical decoupling to suppress crosstalk in quantum circuits

Evert, Bram [Rigetti Computing, Berkeley, CA (United States)] (ORCID:0009000377263554)·Gonzalez Izquierdo, Zoe [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000258603950)·Sud, James [Univ. of Chicago, IL (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000316692913)·Hu, Hong-Ye [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:000000015841831X)·Grabbe, Shon [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)] (ORCID:000900091589512X)·Rieffel, Eleanor G. [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)]·Reagor, Matthew J. [Rigetti Computing, Berkeley, CA (United States); Google Quantum AI, Santa Barbara, CA (United States)]·Wang, Zhihui [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000205724257)
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Abstract

Theoretically understanding and experimentally characterizing and modifying the underlying Hamiltonian of a quantum system is of utmost importance in achieving high-fidelity quantum gates for quantum computing. Here, in this work, we explore the use of dynamical decoupling (DD) in characterizing and suppressing undesired two-qubit couplings as well as the underlying single-qubit decoherence, both significant hurdles to achieving precise quantum control and realizing quantum computing on many hardware prototypes. Through discrete search of DD sequences, we identify sequences that protect against decoherence and selectively target unwanted two-qubit interactions of general form. On a transmon-qubit-based superconducting quantum device, we identify separate white and 1/𝑓 noise components underlying the single-qubit decoherence and a static ZZ coupling between pairs of qubits. A family of syncopated DD sequences is found and their efficiency is demonstrated in two-qubit benchmarking experiments. The syncopated decoupling technique significantly boosts performance in a realistic algorithmic quantum circuit.

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Evert, Bram [Rigetti Computing, Berkeley, CA (United States)] (ORCID:0009000377263554), Gonzalez Izquierdo, Zoe [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000258603950), Sud, James [Univ. of Chicago, IL (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000316692913), Hu, Hong-Ye [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:000000015841831X), Grabbe, Shon [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)] (ORCID:000900091589512X), Rieffel, Eleanor G. [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)], Reagor, Matthew J. [Rigetti Computing, Berkeley, CA (United States); Google Quantum AI, Santa Barbara, CA (United States)], Wang, Zhihui [NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Universities Space Research Association, Moffett Field, CA (United States)] (ORCID:0000000205724257). 2025-10-08. Syncopated dynamical decoupling to suppress crosstalk in quantum circuits. https://doi.org/10.1103/8lxc-lvv1

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