2025/01/17 by Hjalmar Rall, Michael M. Wolf, Rall, Hjalmar +1 · 1 voice · 3 citations
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Mathematical Physics (math-ph) #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph) #math-ph #quant-ph
paper · pdf · doi:10.48550/arxiv.2501.10118
openalex publication_date 2025/01/17 · arxiv published 2025/01/17 · arxiv updated 2025/02/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We investigate the possibility of performing full quantum tomography based on the homogeneous time evolution of a single expectation value. Remarkably, every non-trivial binary measurement evolved by any quantum channel, except for a null set, in principle enables full quantum state tomography. We show that this remains true when restricted to Lindblad semigroups, although unitary evolution -- even with added simply depolarizing noise -- is insufficient beyond the qubit case, highlighting the necessity of non-trivial noise. We establish an analog of Takens' embedding theorem for quantum channels, which incorporates prior information into the framework. We also provide estimation bounds for finite statistics and analyze the feasibility of recovering an infinite time series of expectation values from a finite one using only spectral properties of the evolution.