3 papers
quant-ph2026
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…
quant-ph2026
Random dilation superchannel
Satoshi Yoshida, Ryotaro Niwa, Takeru Utsumi +2
We present a quantum circuit that implements the random dilation superchannel, transforming parallel queries of an unknown quantum channel into the same number of parallel queries…
quant-ph2025
Singular value transformation for unknown quantum channels
Ryotaro Niwa, Zane Marius Rossi, Philip Taranto +1
Given the ability to apply an unknown quantum channel acting on a -dimensional system, we develop a quantum algorithm for transforming its singular values. The spectrum of a qua…