title: Two-photon dynamics in coherent Rydberg atomic ensemble.
abstract: We study the interaction of two photons in a Rydberg atomic ensemble under the condition of electromagnetically induced transparency, combining a semiclassical approach for pulse propagation and a complete quantum treatment for quantum state evolution. We find that the blockade regime is not suitable for implementing photon-photon cross-phase modulation due to pulse absorption and dispersion. However, approximately ideal cross-phase modulation can be realized based on relatively weak interactions, with counterpropagating and transversely separated pulses.
authors.affiliation: Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2 N 1N4, Canada and Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: Bing
authors.initials: B
authors.lastname: He
authors.affiliation: Kirensky Institute of Physics, 50 Akademgorodok, Krasnoyarsk 660036, Russia and Siberian Federal University, 79 Svobodny Avenue, Krasnoyarsk 660041, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Sharypov
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: Jiteng
authors.initials: J
authors.lastname: Sheng
authors.affiliation: Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2 N 1N4, Canada.
authors.forename: Christoph
authors.initials: C
authors.lastname: Simon
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA and National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Min
authors.initials: M
authors.lastname: Xiao