Entanglement and Tunable Spin-Spin Couplings between Trapped Ions Using Multiple Transverse Modes
Kihwan Kim, M.-S. Chang, Rajibul Islam, S. É. Korenblit, L.-M. Duan, Christopher R. Monroe · Physical Review Letters · 2009
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.