Entanglement by a beam splitter: Nonclassicality as a prerequisite for entanglement

Myung Kim

Research output: Contribution to journalArticlepeer-review

455 Citations (Scopus)


A beam splitter is a simple, readily available device which can act to entangle output optical fields. We show that a necessary condition for the fields at the output of the beam splitter to be entangled is that the pure input states exhibit nonclassical behavior. We generalize this proof for arbitrary (pure or impure) Gaussian input states. Specifically, nonclassicality of the input Gaussian fields is a necessary condition for entanglement of the field modes with the help of a beam splitter. We conjecture that this is a general property of beam splitters: Nonclassicality of the inputs is a necessary condition for entangling fields in a beam splitter.
Original languageEnglish
Pages (from-to)032323
Number of pages1
JournalPhysical Review A
Issue number3 A
Publication statusPublished - Mar 2002

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics


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