Quantum information processing with trapped Ca + ions
S. Gulde, Hartmut Häffner, Mark Riebe, Gavin P. T. Lancaster, Christoph Becher, Jürgen Eschner, Ferdinand Schmidt‐Kaler, Isaac L. Chuang, R. Blatt · Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences · 2003
Quantum information processing is performed with single trapped Ca(+) ions, stored in a linear Paul trap and laser-cooled to the ground state of their harmonic quantum motion. Composite laser-pulse sequences were used to implement SWAP gate, phase gate and controlled-NOT gate operations. Stark shifts on the quantum-bit transitions were precisely measured and compensated. For a demonstration of quantum information processing, a Deutsch-Jozsa algorithm has been implemented using two quantum bits encoded on a single ion.