Abstract
We demonstrate the operation of a two-bit "controlled-NOT" quantum logic gate, which, in conjunction with simple single-bit 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 zero-point energy. Decoherence effects are identified for the operation, and the possibility of extending the system to more qubits appears promising.
- Received 14 July 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.4714
©1995 American Physical Society
Focus
Nobel Prize—Tools for Quantum Tinkering
Published 12 October 2012
David Wineland and Serge Haroche, who studied photons and atoms in new ways, have won the 2012 Nobel Prize in Physics.
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