Single photons and quantum effects

Definition

Latest Research and Reviews

  • Research | | open

    Geometric phase is of fundamental interest and has practical application in quantum computation. Here the authors observe continuous-variable geometric phase in a superconducting circuit and demonstrate a multi-qubit controlled phase gate protocol based on this geometric effect.

    • Chao Song
    • , Shi-Biao Zheng
    • , Pengfei Zhang
    • , Kai Xu
    • , Libo Zhang
    • , Qiujiang Guo
    • , Wuxin Liu
    • , Da Xu
    • , Hui Deng
    • , Keqiang Huang
    • , Dongning Zheng
    • , Xiaobo Zhu
    •  & H. Wang
  • Research | | open

    Efficient measurement of orbital angular momentum spectra presents open challenges. Here, the authors demonstrate a highly-efficient interferometric technique in which the OAM-spectrum information is encoded in the azimuthal intensity profile of the output interferogram.

    • Girish Kulkarni
    • , Rishabh Sahu
    • , Omar S. Magaña-Loaiza
    • , Robert W. Boyd
    •  & Anand K. Jha
  • Research | | open

    The presence of entanglement in macroscopic systems is notoriously difficult to observe. Here, the authors develop a witness which allow them to demonstrate entanglement between millions of atoms in a solid-state quantum memory prepared by the heralded absorption of a single photon.

    • Florian Fröwis
    • , Peter C. Strassmann
    • , Alexey Tiranov
    • , Corentin Gut
    • , Jonathan Lavoie
    • , Nicolas Brunner
    • , Félix Bussières
    • , Mikael Afzelius
    •  & Nicolas Gisin
  • Research | | open

    Multipartite entanglement is of both fundamental and practical interest, but is notoriously difficult to witness and characterise. Here, Zarkeshian et al. demonstrate multipartite entanglement in an atomic frequency comb storing a single photon in a Dicke state spread over a macroscopic ensemble.

    • P. Zarkeshian
    • , C. Deshmukh
    • , N. Sinclair
    • , S. K. Goyal
    • , G. H. Aguilar
    • , P. Lefebvre
    • , M. Grimau Puigibert
    • , V. B. Verma
    • , F. Marsili
    • , M. D. Shaw
    • , S. W. Nam
    • , K. Heshami
    • , D. Oblak
    • , W. Tittel
    •  & C. Simon
  • Research | | open

    Here the authors experimentally realize a scheme that deterministically generates entanglement between the wave and particle states of two photons using a scalable all-optical scheme. They achieve this result by first showing generation of controllable single-photon wave-particle superposition states.

    • Adil S. Rab
    • , Emanuele Polino
    • , Zhong-Xiao Man
    • , Nguyen Ba An
    • , Yun-Jie Xia
    • , Nicolò Spagnolo
    • , Rosario Lo Franco
    •  & Fabio Sciarrino

News and Comment