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The Single-Copy Quantum Bandit Is Classical: An Exact Spectral Collapse

Ng, Siu Hin
arXiv (All) · Papers
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We study multi-armed bandits whose arms supply unknown quantum states and whose mean rewards are defined by a known effect $F$. Each fresh copy may be measured by an arbitrary, adaptively chosen POVM. We prove an exact collapse: the measured relative entropy from an arm state to its confusing reward
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