3 papers
quant-ph2026
Optimal lower bound for quantum channel tomography in away-from-boundary regime
Kean Chen, Zhicheng Zhang, Nengkun Yu
Consider quantum channels with input dimension , output dimension and Kraus rank at most . Any such channel must satisfy the constraint , and the parame…
quant-ph2025
Quantum channel tomography and estimation by local test
Kean Chen, Nengkun Yu, Zhicheng Zhang
We study the estimation of an unknown quantum channel with input dimension , output dimension and Kraus rank at most . We establish a connection between…
quant-ph2025
Pauli Measurements Are Near-Optimal for Single-Qubit Tomography
Jayadev Acharya, Abhilash Dharmavarapu, Yuhan Liu +1
We provide the first non-trivial lower bounds for single-qubit tomography algorithms and show that at least copies are required…