Quantum control, quantum information processing, and quantum-limited metrology with trapped ions

We briefly discuss recent experiments on quantum information processing usingtrapped ions at NIST. A central theme of this work has been to increase our capa-bilities in terms of quantum computing protocols, but we have also applied the sameconcepts to improved metrology, particularly in the area of frequency standardsand atomic clocks. Such work may eventually shed light on more fundamentalissues, such as the quantum measurement problem.