Limits to Quantum Gate Fidelity from Near-Field Thermal and Vacuum Fluctuations

• DOI: 10.1103/physrevapplied.19.064038
• Publication Date: 2023-06-12T14:42:41Z
• Authors: Wenbo Sun; Sathwik Bharadwaj; Li-Ping Yang; Yu-Ling Hsueh; Yifan Wang; Dan Jiao; Rajib Rahman; Zubin Jacob
• Keywords: Quantum fluctuation

High-fidelity quantum gate operations are essential for achieving scalable circuits. In spin qubit computing systems, metallic gates and antennas that necessary operation, initialization, readout, also cause detrimental effects by enhancing fluctuations of electromagnetic fields. Therefore, evanescent wave Johnson noise (EWJN) caused near-field thermal vacuum becomes an important unmitigated noise, which induces the decoherence qubits limits operation fidelity. Here, we first develop a macroscopic electrodynamics theory EWJN to account dynamics two interacting with circuitry. Then propose numerical technique based on volume integral equations quantify strength in vicinity nanofabricated arbitrary geometry. We study two-spin-qubit fidelity from EWJN-induced relaxation processes experimentally relevant platforms: (a) silicon dot system (b) nitrogen-vacancy centers diamond. Finally, introduce Lindbladian engineering method optimize control pulse sequence design show its enhanced performance over Hamiltonian mitigating influence fluctuations. Our work leverages advances computational electromagnetics, fluctuational electrodynamics, open systems suppress reach