Bridging discrete and continuous variables in quantum information

Jonas S. Neergaard-Nielsen, Makoto Takeuchi, Kentaro Wakui, Hiroki Takahashi, Kazuhiro Hayasaka, Masahiro Takeoka, Masahide Sasaki

Research output: Contribution to specialist publicationArticle

1 Citation (Scopus)


A study was conducted to bridge discrete and continuous variables (CV) in quantum information. The generated states were best understood in terms of continuous variables when looked at individually. They consisted of contributions from a range of different photon number states and occupied a larger space than the two-dimensional qubit space. It was demonstrated they were reduced to the same squeezed vacuum or squeezed photon superposition space. It was observed the qubit state was conveniently visualized on a Poincaré sphere with the two basis states represented on the north and south poles, while squeezed states were represented by their continuous distributions in a phase space of the two conjugate variables.

Original languageEnglish
Number of pages1
Specialist publicationOptics and Photonics News
Publication statusPublished - 2010 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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