Long-range interactions and entanglement of slow single-photon pulses

Details Long-range interactions and entanglement of slow single-photon pulses Long-range interactions and entanglement of slow single-photon pulses

2005-03-07

arxiv.org/abs/quant-ph/0503071v1

Phys. Rev. A 72, 043803 (2005)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.72.043803

We show that very large nonlocal nonlinear interactions between pairs of colliding slow-light pulses can be realized in atomic vapors in the regime of electromagnetically induced transparency. These nonlinearities are mediated by strong, long-range dipole--dipole interactions between Rydberg states of the multi-level atoms in a ladder configuration. In contrast to previously studied schemes, this mechanism can yield a homogeneous conditional phase shift of pi even for weakly focused single-photon pulses, thereby allowing a deterministic realization of the photonic phase gate.

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