Buffer-Qubit-Based Quantum Circuit Allocation Method Against Crosstalk Attacks
Abstract
Quantum Multi-Programming (QMP) enables the simultaneous execution of quantum circuits from multiple users on a single quantum chip in cloud quantum computing services. However, QMP is vulnerable to crosstalk attacks, in which a malicious user deliberately induces crosstalk to disrupt other users' computations. As a countermeasure, prior work has proposed the use of buffer qubits, which remain idle and are allocated between quantum circuits to suppress the effect of crosstalk. Nevertheless, to the best of our knowledge, such countermeasures have not been publicly reported in production quantum cloud software. In this paper, we extend the QMP of OQTOPUS, open-source software that is already in production use for operating real quantum computers, with a buffer-qubit-based circuit allocation method. Experiments on a real device characterize the attack effect in terms of energy relaxation and dephasing, showing that observable degradation appears in dephasing characteristics of qubits adjacent to the attacker circuit. Based on this result, we release the proposed method as part of OQTOPUS and confirm that the buffer qubits are correctly reserved around the allocated circuits.
Related
- Crosstalk-Induced Row Hammer Attacks on Quantum Random Access Codes
- One-sided-DIQKD using any pure bipartite entangled state secure against all attacks
- Threshold Behavior of ZX and ZY Surface Codes Under Circuit-Level Biased and Crosstalk Noise
- Trinetra.Q: Statistical and Behavioral Detection of Attacks on the Quantum-Error-Correction Layer and Classical Control Stack of Quantum Computing Systems
- Decoder-Prior Poisoning in Quantum Error Correction: Attacks and PriorGuard Defense
BibTeX
@misc{nakayama2026bufferqubitbased,
title = {{Buffer-Qubit-Based Quantum Circuit Allocation Method Against Crosstalk Attacks}},
author = {Haruki Nakayama and Satoyuki Tsukano and Satoshi Kono and Keita Matsumoto and Toshio Mori and Takumi Oikawa and Ryo Uchida},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29050},
eprint = {2610.29050},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29050},
}
RIS
TY - UNPB
TI - Buffer-Qubit-Based Quantum Circuit Allocation Method Against Crosstalk Attacks
AU - Haruki Nakayama
AU - Satoyuki Tsukano
AU - Satoshi Kono
AU - Keita Matsumoto
AU - Toshio Mori
AU - Takumi Oikawa
AU - Ryo Uchida
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29050
UR - https://arxiv.org/abs/2610.29050
AB - Quantum Multi-Programming (QMP) enables the simultaneous execution of quantum circuits from multiple users on a single quantum chip in cloud quantum computing services. However, QMP is vulnerable to crosstalk attacks, in which a malicious user deliberately induces crosstalk to disrupt other users' computations. As a countermeasure, prior work has proposed the use of buffer qubits, which remain idle and are allocated between quantum circuits to suppress the effect of crosstalk. Nevertheless, to the best of our knowledge, such countermeasures have not been publicly reported in production quantum cloud software. In this paper, we extend the QMP of OQTOPUS, open-source software that is already in production use for operating real quantum computers, with a buffer-qubit-based circuit allocation method. Experiments on a real device characterize the attack effect in terms of energy relaxation and dephasing, showing that observable degradation appears in dephasing characteristics of qubits adjacent to the attacker circuit. Based on this result, we release the proposed method as part of OQTOPUS and confirm that the buffer qubits are correctly reserved around the allocated circuits.
ER -