Author

Manaki Arihara

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Preprint Sep 2026

An exponential query advantage from access to Stinespring dilation unitaries in quantum channel learning

We present a learning task for quantum channels that exhibits an exponential separation in query complexity (in terms of the number of qubits) between two access models: i) black-box channel access and ii) access to a Stinespring dilation unitary of the channel along with its inverse. We consider the task of learning h...

Manaki Arihara, Satoshi Yoshida, Philip Taranto et al. · 0 citations

Preprint Aug 2026

Sample-Query Interconversion of Block Encoding of Unknown Quantum States

The results identify inherent limitations of block encoding as a representation of unknown quantum states and reveal a separation between learning properties of a quantum state and generating the state itself, revealing an unavoidable dependence on the dimension of the state.

Manaki Arihara, M. Murao · 1 citation