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Quantum gates and entanglement

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, 2004
Single ions and crystals of ions are confined in a linear Paul trap and are investigated for quantum information processing. Superpositions of the S1/2 ground state and the long lived D 5/2 state are used to implement a qubit. The ions are optically cooled and fluorescence light at 397 nm on the S1/2 - P1/2 transition is monitored for a state ...
T. Deuschle   +9 more
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Quantum gates and degenerations

Journal of Physics A: Mathematical and General, 2004
A three state Hamiltonian with a degenerate ground state is shown to exhibit the property of generating quantum gates for fixed values of the energy parameters just by using the ability of this quantum system to evolve in time yielding suitable sets of quantum probabilities.
Juan Pablo Mateo, Jose M. Cerveró
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Approaching the Quantum Gate

Science, 1996
Quantum computers could potentially solve problems that conventional computers cannot. Constructing such a computer in reality, however, presents extreme challenges. As Voss discusses in his Perspective, two research groups have recently made important breakthroughs in building logic elements, which may someday be used in quantum computers.
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