Fast Rydberg gates without dipole blockade via quantum control

Details Fast Rydberg gates without dipole blockade via quantum control Fast Rydberg gates without dipole blockade via quantum control

2005-11-12

arxiv.org/abs/quant-ph/0511118v1

Physics

Quantum Physics

1 column, 20 pages, 5 figures

Scientific paper

10.1016/j.optcom.2006.01.060

We propose a scheme for controlling interactions between Rydberg-excited neutral atoms in order to perform a fast high-fidelity quantum gate. Unlike dipole-blockade mechanisms already found in the literature, we drive resonantly the atoms with a state-dependent excitation to Rydberg levels, and we exploit the resulting dipole-dipole interaction to induce a controlled atomic motion in the trap, in a similar way as discussed in recent ion-trap quantum computing proposals. This leads atoms to gain the required gate phase, which turns out to be a combination of a dynamic and a geometrical contribution. The fidelity of this scheme is studied including small anharmonicity and temperature effects, with promising results for reasonably achievable experimental parameters.

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