Long-range interactions and entanglement of slow single-photon pulses
Abstract
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 multilevel atoms in a ladder configuration. In contrast to previously studied schemes, this mechanism can yield a homogeneous conditional phase shift of π even for weakly focused single-photon pulses, thereby allowing a deterministic realization of the photonic phase gate.
- Publication:
-
Physical Review A
- Pub Date:
- October 2005
- DOI:
- 10.1103/PhysRevA.72.043803
- arXiv:
- arXiv:quant-ph/0503071
- Bibcode:
- 2005PhRvA..72d3803F
- Keywords:
-
- 42.50.Gy;
- 03.67.Lx;
- Effects of atomic coherence on propagation absorption and amplification of light;
- electromagnetically induced transparency and absorption;
- Quantum computation;
- Quantum Physics
- E-Print:
- 4 pages, 2 figures