title: Efficient single-photon sources based on low-density quantum dots in photonic-crystal nanocavities.
abstract: An efficient single-photon source based on low-density InGaAs quantum dots in a photonic-crystal nanocavity is demonstrated. The single-photon source features the effects of a photonic band gap, yielding a single-mode spontaneous emission coupling efficiency as high as beta = 92% and a linear polarization degree up to p = 95%. This appealing performance makes it well suited for practical implementation of polarization-encoded schemes in quantum cryptography.
authors.affiliation: Department of Physics, National Central University, Chung-li, 32054 Taiwan, Republic of China.
authors.forename: Wen-Hao
authors.initials: WH
authors.lastname: Chang
authors.forename: Wen-Yen
authors.initials: WY
authors.lastname: Chen
authors.forename: Hsiang-Szu
authors.initials: HS
authors.lastname: Chang
authors.forename: Tung-Po
authors.initials: TP
authors.lastname: Hsieh
authors.forename: Jen-Inn
authors.initials: JI
authors.lastname: Chyi
authors.forename: Tzu-Min
authors.initials: TM
authors.lastname: Hsu