Fast Rydberg gates without dipole blockade via quantum control
Year: 2006
Authors: Cozzini M., Calarco T., Recati A., Zoller P.
Autors Affiliation: Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; CNR, INFM, BEC, I-38050 Trento, Italy; Harvard Smithsonian Ctr Astrophys, ITAMP, Cambridge, MA 02138 USA; Univ Innsbruck, Austrian Acad Sci, Inst Quantum Opt & Quantum Informat, Inst Theoret Phys, A-6020 Innsbruck, Austria.
Abstract: 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.
Journal/Review: OPTICS COMMUNICATIONS
Volume: 264 (2) Pages from: 375 to: 384
More Information: Stimulating discussions with P. Grangier are acknowledged. This work was partially supported by the European Commission under Contracts No. IST-2001-38863 (ACQP), FP6-013501-OLAQUI, FP6-015714-SCALA, and by the National Science Foundation through a grant for the Institute for Theoretical Atomic, Molecular and Optical Physics at Harvard University and Smithsonian Astrophysical Observatory. Work at the University of Innsbruck is supported by the Austrian National Science Foundation and the EU projects.KeyWords: quantum phase gate; Rydberg statesDOI: 10.1016/j.optcom.2006.01.060Citations: 17data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)