Because of their long coherence times, dopant ions have been considered promising candidates for scalable solid state quantum computing. Here we demonstrate a conditional phase shift between two qubits based on an optical transition of europium ions. The demonstration uses ensembles that have been selected from a randomly doped sample using spectral hole burning techniques. The electron dipole-dipole interaction between the ions that usually causes instantaneous spectral diffusion is used to generate the conditional phase shift.
Physical Review Letters
- Pub Date:
- September 2004
- Quantum computation;
- Other topics in optical properties condensed matter spectroscopy and other interactions of particles and radiation with condensed matter;
- Coherent spectroscopy of atoms and molecules;
- Quantum Physics