Volume 65, Number 5, March 2004
|587 - 593
|01 February 2004
Quantized AC-Stark shifts and their use for multiparticle entanglement and quantum gates
Institut für Experimentalphysik - 6020 Innsbruck, Austria
Accepted: 18 December 2003
A single -ion is trapped and laser-cooled to its motional ground state. Laser radiation which couples off-resonantly to a motional sideband of the ion's to transition causes a phase shift proportional to the ion's motional quantum state . As the phase shift is conditional upon the ion's motion, we are able to demonstrate a universal 2-qubit quantum gate operation where the electronic target state is flipped depending on the motional qubit state . Finally, we discuss scaling properties of this universal quantum gate for linear ion crystals and present numerical simulations for the generation of a maximally entangled state of five ions.
PACS: 03.67.Lx – Quantum computation / 03.65.Ud – Entanglement and quantum nonlocality (e.g., EPR paradox, Bell's inequalities, GHZ states, etc.)
© EDP Sciences, 2004
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