Entanglement and tunable spin-spin couplings between trapped ions using multiple transverse modes

Phys Rev Lett. 2009 Sep 18;103(12):120502. doi: 10.1103/PhysRevLett.103.120502. Epub 2009 Sep 16.

Abstract

We demonstrate tunable spin-spin couplings between trapped atomic ions, mediated by laser forces on multiple transverse collective modes of motion. A sigma_{x}sigma_{x}-type Ising interaction is realized between quantum bits stored in the ground hyperfine clock states of ;{171}Yb;{+} ions. We demonstrate entangling gates and tailor the spin-spin couplings with two and three trapped ions. The use of closely spaced transverse modes provides a new class of interactions relevant to quantum computing and simulation with large collections of ions in a single crystal.