We propose a scheme for the determination of the coupling parameters in a chain of interacting spins. This requires only time-resolved measurements over a single particle, simple data post-processing and no state initialization or prior knowledge of the state of the chain. The protocol fits well into the context of quantum-dynamics characterization and is efficient even when the spin-chain is affected by general dissipative and dephasing channels. We illustrate the performance of the scheme by analyzing explicit examples and discuss possible extensions.
@article{arxiv.0812.3510,
title = {Hamiltonian tomography in an access-limited setting without state initialization},
author = {C. Di Franco and M. Paternostro and M. S. Kim},
journal= {arXiv preprint arXiv:0812.3510},
year = {2009}
}