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quant-ph2026
Online Shadow Tomography Matching the Classical Bounds
Sitan Chen, Ryan O'Donnell, Angelos Pelecanos +1
In Online Shadow Tomography, we are given copies of an unknown -dimensional quantum state , an adversary (adaptively) proposes a sequence of bounded observables $A^{(1)},\ldo…
quant-ph2024
Query-optimal estimation of unitary channels in diamond distance
Jeongwan Haah, Robin Kothari, Ryan O'Donnell +1
We consider process tomography for unitary quantum channels. Given access to an unknown unitary channel acting on a -dimensional qudit, we aim to output a classical des…
quant-ph2024
Quantum chi-squared tomography and mutual information testing
Steven T. Flammia, Ryan O'Donnell
For quantum state tomography on rank- dimension- states, we show that copies suffice for accuracy~ with respe…