Radioactive Quantum Computing

Dave and Justin have recently trapped a synthetic isotope of barium and performed some preliminary spectroscopy of its structure.  Singly-ionized barium-133 has an internal structure that makes it the envy of all trapped ion qubits -- the spin-1/2 nucleus makes it easy to initialize, the metastable D states are extremely long-lived for a process called "shelving," and the lasers are all in the friendly visible part of the spectrum.  This work is a collaboration with Eric Hudson, and you can learn more by reading the paper, which came out today in Physical Review Letters.