title: Quantum entanglement of Fock states with perfectly efficient ultraslow single-probe photon four-wave mixing.
abstract: We propose a method to achieve quantum entanglement of two Fock states with perfectly efficient, ultraslow propagation enhanced four-wave mixing. A cold atomic medium is illuminated with a two-mode cw control laser to produce coherent mixtures of excited states. An ultraslowly propagating, single-photon quantum probe field completes the four-wave mixing with 100% photon flux conversion efficiency, creating a depth dependent entanglement of two Fock states. We show that at a suitable propagation distance, a maximum entangled state is created with a single-photon wave-packet state that has 50% probability of being in each of two product-type Fock states.
authors.affiliation: Electron & Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Payne
authors.forename: L
authors.initials: L
authors.lastname: Deng