Multi-tenant computing enables providers of commercial cloud quantum processors to rent disjoint sectors of a device to independent users. Average gate error, which cloud quantum computing providers report, does not determine how much one tenant learns about another. We propose an information-theoretic notion of inform...
This work proves that computing this leakage is equivalent to minimum-error quantum state discrimination with equal priors, and establishes a computable operational interpretation, addressing the previous difficulty in computing maximal quantum leakage.
F fidelity-based and relative-entropy-based sufficient conditions for bounding the variation of maximal quantum leakage are derived, and it is illustrated numerically that these conditions can be loose.
It is proved that the accuracy of any quantum-computing inference procedure is upper bounded by the maximal quantum leakage from the classical data through its quantum encoding, establishing leakage as a universal, task-agnostic quality measure for encoders.
Farhad Farokhi, Shuixin Xiao· 0 citations
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