Hamiltonian identifiability assisted by single-probe measurement
arXiv:1609.09446 · doi:10.1103/PhysRevA.95.022335
Abstract
We study the Hamiltonian identifiability of a many-body spin-1/2 system assisted by the measure- ment on a single quantum probe based on the eigensystem realization algorithm (ERA) approach employed in Phys. Rev. Lett. 113, 080401 (2014). We demonstrate a potential application of Gröbner basis to the identifiability test of the Hamiltonian, and provide the necessary experimental resources, such as the lower bound in the number of the required measurement points, the upper bound in total required evolution time, and thus the total measurement time. Focusing on the examples of the identifiability in the spin chain model with nearest-neighboring interaction, we classify the spin-chain Hamiltonian based on its identifiability, and provide the control protocols to engineer the nonidentifiable Hamiltonian to be an identifiable Hamiltonian.
v2: 17 pages, fixed typos, added references, appendixes, and robustness analyses (2 figures). Thanks to referees and editors for helpful comments. Accepted by Physical Review A
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