Syncopated Dynamical Decoupling for Suppressing Crosstalk in Quantum Circuits

• URL: http://arxiv.org/abs/2403.07836v1
• Date: Tue, 12 Mar 2024 17:18:35 GMT
• Title: Syncopated Dynamical Decoupling for Suppressing Crosstalk in Quantum Circuits
• Authors: Bram Evert, Zoe Gonzalez Izquierdo, James Sud, Hong-Ye Hu, Shon Grabbe, Eleanor G. Rieffel, Matthew J. Reagor, and Zhihui Wang
• Abstract summary: We study the use of dynamical decoupling in characterizing undesired two-qubit couplings and the underlying single-qubit decoherence. We develop a syncopated decoupling technique which protects against decoherence and selectively targets unwanted two-qubit interactions.
• Score: 12.29963230632145
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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. In this work, we explore the use of dynamical decoupling (DD) in characterizing undesired two-qubit couplings as well as the underlying single-qubit decoherence, and in suppressing them. We develop a syncopated dynamical decoupling technique which protects against decoherence and selectively targets unwanted two-qubit interactions, overcoming both significant hurdles to achieving precise quantum control and realizing quantum computing on many hardware prototypes. 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. We suppress these errors using syncopated dynamical decoupling in two-qubit benchmarking experiments and significantly boost performance in a realistic algorithmic quantum circuit.

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