title: Distillation of photon entanglement using a plasmonic metamaterial.
abstract: Plasmonics is a rapidly emerging platform for quantum state engineering with the potential for building ultra-compact and hybrid optoelectronic devices. Recent experiments have shown that despite the presence of decoherence and loss, photon statistics and entanglement can be preserved in single plasmonic systems. This preserving ability should carry over to plasmonic metamaterials, whose properties are the result of many individual plasmonic systems acting collectively, and can be used to engineer optical states of light. Here, we report an experimental demonstration of quantum state filtering, also known as entanglement distillation, using a metamaterial. We show that the metamaterial can be used to distill highly entangled states from less entangled states. As the metamaterial can be integrated with other optical components this work opens up the intriguing possibility of incorporating plasmonic metamaterials in on-chip quantum state engineering tasks.
authors.affiliation: Department of Material Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Asano
authors.affiliation: Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany.|Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany.
authors.forename: Muriel
authors.initials: M
authors.lastname: Bechu
authors.affiliation: School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa.|National Institute for Theoretical Physics, University of KwaZulu-Natal, Durban 4001, South Africa.
authors.forename: Mark
authors.initials: M
authors.lastname: Tame
authors.affiliation: Department of Electrical and Systems Engineering, Washington University, St. Louis, MO 63130, USA.
authors.forename: Şahin
authors.initials: Ş
authors.lastname: Kaya Özdemir
authors.affiliation: Department of Material Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Rikizo
authors.initials: R
authors.lastname: Ikuta
authors.affiliation: Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, MI 49931, USA.
authors.forename: Durdu Ö
authors.initials: DÖ
authors.lastname: Güney
authors.affiliation: Department of Material Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: Department of Electrical and Systems Engineering, Washington University, St. Louis, MO 63130, USA.
authors.forename: Lan
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany.|Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Wegener
authors.affiliation: Department of Material Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Imoto