Quantum Memory Advantage for Process Tomography
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Statement
Does quantum memory give a query-complexity advantage for learning an unknown quantum channel, when protocols without it must measure after each channel use and keep only a classical transcript? It does, and the paper also determines how little coherent memory suffices for the advantage to appear.
Context
A named open question in quantum process tomography, part of the memory-versus-no-memory separation programme that has been active across quantum learning theory.
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