High fidelity control of superconducting qubits with optical transmitted signal

• URL: http://arxiv.org/abs/2608.19602v1
• Date: Thu, 20 Aug 2026 03:40:06 GMT
• Title: High fidelity control of superconducting qubits with optical transmitted signal
• Abstract summary: We experimentally implement an optically-assisted transmission line as an alternative to coaxial cables.<n>We demonstrate and benchmark both single-qubit and two-qubit gates on frequency tunable transmon qubits, achieving fidelities of 99.915% $pm$ 0.005% and 99.676% $pm$ 0.041%, respectively.
• Score: 22.614113884486045
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Superconducting circuits exhibit remarkable potential for constructing large-scale quantum simulation and computation systems, featuring numerous qubits, extended coherence time, and precise control. Nevertheless, the growing number of signal cables poses a challenge in dilution refrigerators due to space and heat load constraints. To overcome this issue, we experimentally implemented an optically-assisted transmission line as an alternative to coaxial cables. By modulating microwave signals on laser intensities at room temperature and regenerating the signals at a cryogenic plate within the dilution refrigerator, we demonstrated full control of superconducting qubits using photocurrent. We demonstrate and benchmark both single-qubit and two-qubit gates on frequency tunable transmon qubits, achieving fidelities of 99.915% $\pm$ 0.005% and 99.676% $\pm$ 0.041%, respectively, which have reached the requirement of the surface code.

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