title: Superdense teleportation using hyperentangled photons.
abstract: Transmitting quantum information between two remote parties is a requirement for many quantum applications; however, direct transmission of states is often impossible because of noise and loss in the communication channel. Entanglement-enhanced state communication can be used to avoid this issue, but current techniques require extensive experimental resources to transmit large quantum states deterministically. To reduce these resource requirements, we use photon pairs hyperentangled in polarization and orbital angular momentum to implement superdense teleportation, which can communicate a specific class of single-photon ququarts. We achieve an average fidelity of 87.0(1)%, almost twice the classical limit of 44% with reduced experimental resources than traditional techniques. We conclude by discussing the information content of this constrained set of states and demonstrate that this set has an exponentially larger state space volume than the lower-dimensional general states with the same number of state parameters.
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: Trent M
authors.initials: TM
authors.lastname: Graham
authors.affiliation: Institute for Science &Interdisciplinary Studies &School of Natural Sciences, Hampshire College, Amherst, Massachusetts 01002, USA.
authors.forename: Herbert J
authors.initials: HJ
authors.lastname: Bernstein
authors.affiliation: C.N. Yang Institute for Theoretical Physics and Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794, USA.
authors.forename: Tzu-Chieh
authors.initials: TC
authors.lastname: Wei
authors.affiliation: Department of Mathematics, University of Illinois at Urbana-Champaign, 1409 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: Marius
authors.initials: M
authors.lastname: Junge
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: Paul G
authors.initials: PG
authors.lastname: Kwiat