Allen Mi and colleagues at Yale University warn that even carefully wiping quantum computers of data would not thwart its theft by hackers.
Companies offer timeshare access to nascent quantum computers.
The researchers used artificial intelligence to assemble a model that identified quantum bit (qubit) fluctuations that happen when manipulating other qubits on IBM's quantum service, enabling them to detect what another user sharing the same machine was doing by observing only the qubits they had been assigned to use.
The researchers also retrieved data from a user when accessing the system after them, even following a qubit reset, by reverse-engineering the final state of qubits on the last run.
Mi said it is critical for quantum computer operators to conduct a random number of resets to foil reverse engineering.
From New Scientist
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