Phys. Rev. Lett. 75, 4714–4717 (1995)Demonstration of a Fundamental Quantum Logic GateReceived 14 July 1995; published in the issue dated 18 December 1995 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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.4714
DOI:
10.1103/PhysRevLett.75.4714
PACS:
89.80.+h, 03.65.-w, 32.80.Pj
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