Indirect Hamiltonian Identification through a small gateway

Daniel Klaus Burgarth, Koji Maruyama

Research output: Contribution to journalArticlepeer-review

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Identifying the many-body Hamiltonian of a large quantum system is essential in understanding many physical phenomena, yet extremely difficult in general. We show that coupling strengths in networks of spin-1/2 particles can be estimated indirectly through a gateway, provided that the coupling topology is known. The criterion for the feasibility of identification is described only by a simple topological property concerning how the gateway is connected to the entire network. We also address the issues of process efficiency and how degeneracies of the system can be lifted.
Original languageEnglish
Article number103019
JournalNew Journal of Physics
Publication statusPublished - 07 Oct 2009


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