Mesoscopic atomic ensembles for quantum information

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• Ilya Beterov (A.V.Rzhanov Institute of Semiconductor Physics, Novosibirsk)
• Friday 02 August 2013, 14:00-15:00
• Physics East 217.

If you have a question about this talk, please contact Vincent Boyer.

Quantum information can be stored in collective states of ensembles of strongly interacting atoms. This idea can be extended to encoding an entire register of qubits in ensembles of atoms with multiple ground states which opens up the possibility of large quantum registers in a single atomic ensemble or of coupling arrays of small ensembles in a scalable atom chip based architecture. The enhanced coupling of the mesoscopic ensembles to the radiation field in the regime of Rydberg blockade is useful for coupling matter qubits to single photons. However, due to the increase of the Rabi frequency of oscillations between different collective states proportional to square root of the number of atoms it is difficult to perform gates with well defined rotation angles in the situation where number of atoms is unknown. We have proposed double adiabatic sequences which remove the phase sensitivity, and can be used to implement gates on collectively encoded qubits without precise knowledge of the number of atoms.

We have experimentally studied excitation and detection statistics in a small ensemble of ultracold interacting Rydberg atoms using single-atom resolution of our detection system. The signatures of dipole blockade at Forster resonance have been observed in experiments on three-photon laser spectroscopy.

This talk is part of the Cold Atoms series.

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• Bham Talks
• Cold Atoms
• Physics East 217
• What's on in Physics?

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