Quantum logic gate with microtraps

Ralph G. DeVoe, Christian Kurtsiefer

We have measured a coherence lifetime > 1 millisecond for the phonons in a Cirac-Zoller quantum logic gate using the Ba137 ion. The microtrap of 80 microns radius does not show an anomalously fast decay.

Shinil Cho

X. X. Yi

This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

Александр Алексеевич Горбацевич, Н. М. Шубин

L. V. Gerasimov, Dmitriy V. Kupriyanov, Stanislav S. Straupe

The implementation of a quantum logic gate in a system of cold atoms in optical microtraps is analyzed. The dynamics of two spin qubits is simulated, and a number of processes that limit the efficiency of entanglement based on the Rydberg blockade effect are considered. A geometry of two-photon excitation of Rydberg states of atoms is proposed that makes it possible to increase the robustness of the system to variations in a number of parameters and to reduce losses associated with the incoherent scattering of the driving field.