The Hamiltonian of a natural quantum system is usually determined indirectly, by proposing microscopic models and comparing their predicted observables with experiment. A more direct approach is to extract information about the Hamiltonian from measurements on the system itself. In many settings, however, direct access...
Shunji Matsuura, Yoji Kawamura, J. Salfi et al.· 1 citation
Krylov and Lanczos approximations are used in quantum dynamics, quantum subspace methods, and Hamiltonian learning. A practical question is how long an $m$-dimensional Krylov truncation can be trusted. We argue that this time is fixed by causal propagation on the associated Jacobi chain. The relevant distance is not th...
Shunji Matsuura, Yoji Kawamura, J. Salfi et al.· 4 citations
This work introduces discretization-aware fine-tuning (DAFT), a method that adapts a pre-trained chemical foundation model to produce representations that remain informative after quantization, and evaluates both quantum and classical models under a controlled setting in which they receive identical discretized bit-str...
Shunji Matsuura, S. Johri· 0 citations
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