Conditional production of superpositions of coherent states with inefficient photon detection

Myung Kim

Research output: Contribution to journalArticlepeer-review

150 Citations (Scopus)


It is shown that a linear superposition of two macroscopically distinguishable optical coherent states can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a coherent state superposition in a free propagating optical field with a large coherent amplitude (alpha>2) and high fidelity (F>0.99). In contrast to all previous schemes to generate such a state, our scheme does not need photon number resolving measurements nor Kerr-type nonlinear interactions. Furthermore, it is robust to detection inefficiency and exhibits some resilience to photon production inefficiency.
Original languageEnglish
Pages (from-to)020101
Number of pages1
JournalPhysical Review A
Issue number2
Publication statusPublished - Aug 2004

ASJC Scopus subject areas

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


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