Coupling strength estimation for spin chains despite restricted access

Franco Nori, Koji Maruyama, Daniel Burgarth

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Quantum control requires full knowledge of the system many-body Hamiltonian. In many cases this information is not directly available due to restricted access to the system. Here we show how to indirectly estimate all the coupling strengths in a spin chain by measuring one spin at the end of the chain. We also discuss the efficiency of this “quantum inverse problem” and give a numerical example.
Original languageEnglish
JournalPhysical Review A
Issue number2
Publication statusPublished - 26 Sept 2011


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