Towards fault-tolerant quantum computing with optically controlled superconducting qubits
Year: 2026
Type: article
Abstract: With the rapid development of superconducting quantum computing and the implementation of surface codes, scalable and highly integrated qubit control has emerged as an urgent demand. While optical transmission has been proposed to replace coaxial cables for scalable qubit control, a high-channel-density system with systematically validated qubit coherence and gate performance is still lacking. Here we present a multichannel optical control system implemented using custom optoelectronic circuit boards and evaluate it through a comprehensive benchmarking suite covering the control electronics (equivalent thermal noise), qubit coherence ( T 1 , T 2 ∗ ), and single-qubit and two-qubit gate fidelities. The measured two-qubit controlled-Z (CZ) gate fidelity reaches 99.424±0.083%, demonstrating that the developed multichannel optical control system has met the fidelity requirements for surface-code-based fault-tolerant quantum computing.
Source: Optics Express
DOI: 10.1364/oe.616363
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7223697804