Experimental demonstration of quantum state tomography and qubit-qubit interactions for rare-earth-ion based solid state qubits

Details Experimental demonstration of quantum state tomography and qubit-qubit interactions for rare-earth-ion based solid state qubits Experimental demonstration of quantum state tomography and qubit-qubit interactions for rare-earth-ion based solid state qubits

2002-08-29

arxiv.org/abs/quant-ph/0208182v2

Physics

Quantum Physics

Scientific paper

We report on the implementation of quantum state tomography for an ensemble of Eu$^{3+}$ dopant ions in a \YSO crystal. The tomography was applied to a qubit based on one of the ion's optical transitions. The qubit was manipulated using optical pulses and measurements were made by observing the optical free induction in a phase sensitive manner. Fidelities of $>90$% for the combined preparation and measurement process were achieved. Interactions between the ions due to the change in the ions' permanent electric dipole moment when excited optically were also measured. In light of these results, the ability to do multi-qubit quantum computation using this system is discussed.

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