Spin-dependent forces on trapped ions for phase-stable quantum gates and motional Schrodinger-cat states

Details Spin-dependent forces on trapped ions for phase-stable quantum gates and motional Schrodinger-cat states Spin-dependent forces on trapped ions for phase-stable quantum gates and motional Schrodinger-cat states

2004-11-09

arxiv.org/abs/quant-ph/0411068v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.153602

Favored schemes for trapped-ion quantum logic gates use bichromatic laser fields to couple internal qubit states with external motion through a "spin-dependent force." We introduce a new degree of freedom in this coupling that reduces its sensitivity to phase decoherence. We demonstrate bichromatic spin-dependent forces on a single trapped $^{111}$Cd$^+$ ion, and show that phase coherence of the resulting "Schr\"{o}dinger-cat" states of motion depends critically upon the spectral arrangement of the optical fields. This applies directly to the operation of entangling gates on multiple ions.

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