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This breakthrough replaces traditional coaxial cables with optical transmission to control superconducting qubits, directly addressing the spatial and thermal bottlenecks that hinder scaling quantum processors. By achieving single-qubit gate fidelities exceeding 99.9%, this method paves the way for dense qubit integration required for practical error correction and surface code implementation.
Researchers Achieve 99.915% Fidelity in Qubit Control Via Light

High fidelity control of superconducting qubits with optical transmitted signal Single-qubit gate fidelity now reaches 99. 915 ±0. 005%, while two-qubit CZ gate fidelity attains 99.
Scaling up superconducting quantum computers has been limited by increasing numbers of signal cables within dilution refrigerators due to space constraints and heat build-up. Full control of superconducting qubits is now achieved using optically transmitted signals instead of traditional coaxial cables. A new method controls quantum bits, known as qubits, with light in place of metal cabling inside dilution refrigerators. These specialised cooling systems are essential for maintaining ultra-low temperatures required…
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