title: Generation of entangled photons in graphene in a strong magnetic field.
abstract: Entangled photon states attract tremendous interest as the most vivid manifestation of nonlocality of quantum mechanics and also for emerging applications in quantum information. Here we propose a mechanism of generation of polarization-entangled photons, which is based on the nonlinear optical interaction (four-wave mixing) in graphene placed in a magnetic field. Unique properties of quantized electron states in a magnetized graphene and optical selection rules near the Dirac point give rise to a giant optical nonlinearity and a high rate of photon production in the mid- or far-infrared range. A similar mechanism of photon entanglement may exist in topological insulators where the surface states have a Dirac-cone dispersion and demonstrate similar properties of magneto-optical absorption.
authors.affiliation: Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Tokman
authors.affiliation: Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Xianghan
authors.initials: X
authors.lastname: Yao
authors.affiliation: Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Alexey
authors.initials: A
authors.lastname: Belyanin