Experimental quantum state tomography of a solid state qubit

Details Experimental quantum state tomography of a solid state qubit Experimental quantum state tomography of a solid state qubit

2007-08-06

arxiv.org/abs/0708.0764v1

Physics

Quantum Physics

5 pages, 3 figures (eps)

Scientific paper

10.1103/PhysRevA.77.022307

Full quantum state tomography is used to characterize the state of an ensemble based qubit implemented through two hyperfine levels in Pr3+ ions, doped into a Y2SiO5 crystal. We experimentally verify that single-qubit rotation errors due to inhomogeneities of the ensemble can be suppressed using the Roos-Moelmer dark state scheme. Fidelities above >90%, presumably limited by excited state decoherence, were achieved. Although not explicitly taken care of in the Roos-Moelmer scheme, it appears that also decoherence due to inhomogeneous broadening on the hyperfine transition is largely suppressed.

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