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Researchers have identified side-channel vulnerabilities in the digital readout circuits of superconducting quantum computers, specifically within Josephson phase digital detector systems. These findings reveal that fluctuations in bias currents can leak information about qubit states through supporting electronics rather than the qubits themselves. This discovery necessitates a paradigm shift in quantum security protocols to protect the architectural infrastructure essential for scalable quantum computing.
Qubit readout circuits found vulnerable to side-channel attacks
Researchers found side-channel vulnerabilities in digital readout circuits for superconducting qubits, published August 4, 2026, in Quantum Science and Technology.
Researchers at the University of Rochester have demonstrated that side-channel attacks are possible on the digital readout circuits, not the qubits themselves, used in superconducting quantum computers. The work, published August 4, 2026 in Quantum Science and Technology, details how fluctuations in bias current within a Josephson phase digital detector system can reveal information about qubit states. Extensive simulations show these fluctuations propagate through the detector’s bias network, creating measurable perturbations. All data supporting the findings are included within the article and any supplementary files. A vulnerability has emerged in the architecture underpinning scalable superconducting quantum…
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