Quantum gate using qubit states separated by terahertz

Abstract

A two-qubit quantum gate is realized using electronic excited states in a single ion with an energy separation on the order of a terahertz times the Planck constant as a qubit. Two phase locked lasers are used to excite a stimulated Raman transition between two metastable states $D_{3/2}$ and $D_{5/2}$ separated by 1.82 THz in a single trapped ${}^{40}$Ca${}^{+}$ ion to construct a qubit, which is used as the target bit for the Cirac-Zoller two-qubit controlled NOT gate. Quantum dynamics conditioned on a motional qubit is clearly observed as a fringe reversal in Ramsey interferometry.

4 pages, 4 figures

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Cited by in corpus (5)

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• Generation of Dicke states using adiabatic passage
• Thermally induced entanglement of atomic oscillators
• Coherent internal state transfer by three-photon STIRAP-like scheme for many-atom samples