Correlation of matched electric fields in four-level atoms via electromagnetically induced transparency

Masahiro Takeoka, Fumihiko Kannari

Research output: Contribution to journalArticle


We investigated the matching of two continuous fields in a closed four-level system quantum mechanically. When the atomic coherence is prepared in the dressed state by two strong external coupling fields, fluctuations of phase and amplitude between the two probe fields are selectively absorbed, while these fields are mainly transparent in the media. Such selective absorption establishes the phase and amplitude correlation between the two weak probe fields over a wide range of frequencies. However, the correlation remains limited by the standard quantum limit, because of the addition of the anti-phase atomic noise during the four-wave mixing process.

Original languageEnglish
Pages (from-to)L1249-L1251
JournalJapanese journal of applied physics
Issue number12 A
Publication statusPublished - 2000 Dec 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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