title: Large cross-phase modulation between slow copropagating weak pulses in 87Rb.
abstract: We propose a scheme to generate double electromagnetically induced transparency and optimal cross-phase modulation for two slow, copropagating pulses with matched group velocities in a single species of atom, namely 87Rb. A single pump laser is employed and a homogeneous magnetic field is utilized to avoid cancellation effects through the nonlinear Zeeman effect. We suggest a feasible preparational procedure for the atomic initial state to achieve matched group velocities for both signal fields.
authors.affiliation: Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
authors.forename: Zeng-Bin
authors.initials: ZB
authors.lastname: Wang
authors.forename: Karl-Peter
authors.initials: KP
authors.lastname: Marzlin
authors.forename: Barry C
authors.initials: BC
authors.lastname: Sanders