Understanding Side-Channel Vulnerabilities in Superconducting Qubit Readout Architectures

Abstract

Frequency-multiplexing is an effective method to achieve resource-efficient superconducting qubit readout. Allowing multiple resonators to share a common feedline, the number of cables and passive components involved in the readout of a qubit can be drastically reduced. However, this improvement in scalability comes at the price of a crucial non-ideality -- an increased readout crosstalk. Prior works have targeted building better devices and discriminators to reduce its effects, as readout-crosstalk-induced qubit measurement errors are detrimental to the reliability of a quantum computer. However, in this work, we show that beyond the reliability of a system, readout crosstalk can introduce vulnerabilities in a system being shared among multiple users. These vulnerabilities are directly related to correlated errors due to readout crosstalk. These correlated errors can be exploited by nefarious attackers to predict the state of the victim qubits, resulting in information leakage.

References in corpus (6)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Software Mitigation of Crosstalk on Noisy Intermediate-Scale Quantum Computers
• Tomography via Correlation of Noisy Measurement Records
• Scaling Qubit Readout with Hardware Efficient Machine Learning Architectures
• Quantum Circuit Reconstruction from Power Side-Channel Attacks on Quantum Computer Controllers

Cited by in corpus (2)

• OPAQUE: Obfuscating Phase in Quantum Circuit Compilation for Efficient IP Protection
• Online Job Scheduler for Fault-tolerant Quantum Multiprogramming