Coupling strength estimation for spin chains despite restricted access

Details Coupling strength estimation for spin chains despite restricted access Coupling strength estimation for spin chains despite restricted access

2008-10-16

arxiv.org/abs/0810.2866v2

Phys. Rev. A 79, 020305(R) (2009)

Physics

Quantum Physics

improved version with additional reference

Scientific paper

10.1103/PhysRevA.79.020305

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.

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