Full control by locally induced relaxation

Details Full control by locally induced relaxation Full control by locally induced relaxation

2007-04-23

arxiv.org/abs/0704.3027v1

Phys. Rev. Lett. 99, 100501 (2007)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.99.100501

We demonstrate a scheme for controlling a large quantum system by acting on a small subsystem only. The local control is mediated to the larger system by some fixed coupling Hamiltonian. The scheme allows to transfer arbitrary and unknown quantum states from a memory on the large system (``upload access'') as well as the inverse (``download access''). We study sufficient conditions of the coupling Hamiltonian and give lower bounds on the fidelities for downloading and uploading.

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