Generating entangled states of two ququarts using linear optical elements

So Young Baek, Yoon Ho Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Recently, quantum systems with D-dimensional bases states (D > 2) or quDits have attracted much attention in the context of fundamental tests of quantum theory and potential applications in quantum information. In this paper, we discuss several schemes for generating entangled states of two ququarts (four-dimensional quantum systems). The ququart in our scheme is based on frequency-nondegenerate biphoton states of spontaneous parametric down-conversion and we show how the entangled states between two ququarts can be generated with simple linear optical elements, such as an ordinary 50/50 beamsplitter, a polarizing beamsplitter, or a dichroic beamsplitter. We also show that our scheme is capable of generating postselection-free two-ququart entangled states efficiently.

Original languageEnglish
Title of host publicationQuantum Communications and Quantum Imaging IV
Publication statusPublished - 2006
Externally publishedYes
EventQuantum Communications and Quantum Imaging IV - San Diego, CA, United States
Duration: 2006 Aug 132006 Aug 14

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherQuantum Communications and Quantum Imaging IV
Country/TerritoryUnited States
CitySan Diego, CA


  • High dimensional quantum state
  • Quantum entanglement
  • Ququart
  • Spontaneous parametric down-conversion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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