Quantum

Buffer-Qubit-Based Quantum Circuit Allocation Method Against Crosstalk Attacks

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Briefings

This paper introduces a buffer-qubit-based circuit allocation method for Quantum Multi-Programming (QMP) systems to mitigate crosstalk attacks. Experiments on a real quantum device demonstrated that malicious attackers can induce observable degradation in dephasing characteristics of qubits adjacent to their circuits. The method was successfully integrated into OQTOPUS, an open-source production software, and confirmed by the researchers that buffer qubits are correctly reserved around allocated circuits.

Key points

• The paper extends the QMP protocol of OQTOPUS with a buffer-qubit allocation method to counter crosstalk attacks.
• Experiments on a real quantum device showed that attackers can induce observable dephasing degradation in qubits adjacent to their circuits.

Context

Quantum Multi-Programming (QMP) allows simultaneous execution of circuits from multiple users on a single chip, but is vulnerable to crosstalk attacks. Prior work proposed buffer qubits as a countermeasure, but this paper reports the first public implementation of such a method in production cloud software.

Limitations

The attack effect was characterized only in terms of energy relaxation and dephasing metrics. The paper does not provide specific numerical values for attack success rates or the exact number of buffer qubits required for effective protection.

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