Demonstration of a fundamental quantum logic gate
Abstract
We demonstrate the operation of a twobit ``controlledNOT'' quantum logic gate, which, in conjunction with simple singlebit operations, forms a universal quantum logic gate for quantum computation. The two quantum bits are stored in the internal and external degrees of freedom of a single trapped atom, which is first laser cooled to the zeropoint energy. Decoherence effects are identified for the operation, and the possibility of extending the system to more qubits appears promising.
 Publication:

Physical Review Letters
 Pub Date:
 December 1995
 DOI:
 10.1103/PhysRevLett.75.4714
 Bibcode:
 1995PhRvL..75.4714M
 Keywords:

 89.80.+h;
 03.65.w;
 32.80.Pj;
 Quantum mechanics;
 Optical cooling of atoms;
 trapping