21 papers
Multicast quantum network coding as optimal symmetric universal cloning over a quantum network
Go Kato, Mio Murao, Masaki Owari
We study the problem of perfectly multicasting symmetric universal clones of unknown quantum states over quantum networks with free classical communication. We construct a protocol…
Optimal complex conjugation of unknown isometry channels
Satoshi Yoshida, Mio Murao
Access to the complex conjugate of an unknown quantum channel is a useful resource in quantum oracle problems, motivating the question of how such access can be simulated using onl…
Quantum State Preparation via Free Binary Decision Diagram
Yu Tanaka, Hayata Yamasaki, Mio Murao
Quantum state preparation (QSP) is a fundamental task in quantum computation to prepare a quantum state for a given classical description of the quantum state. The classical descri…
Probabilistic Storage and Retrieval of Quantum Superchannels for "Retrospective'' Intervention
Wataru Yokojima, Jisho Miyazaki, Mio Murao
Storing an unknown quantum computation in a quantum state and retrieving it at a desired later time is a challenging task, hindered by the no-programming theorem of quantum computa…
Scaling-optimal purification of noisy qubit unitary channels
Ryotaro Niwa, Satoshi Yoshida, Koki Ono +5
We consider the problem of purifying noisy qubit unitary channels. Given the ability to apply an unknown qubit unitary channel followed by depolarizing noise, we aim to construct a…
Sequential quantum processes with group symmetries
Dmitry Grinko, Satoshi Yoshida, Mio Murao +1
Symmetry plays a crucial role in the design and analysis of quantum protocols. This result shows a canonical circuit decomposition of a -invariant quantum comb for com…