Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection

Shigenari Suzuki, Masahiro Takeoka, Masahide Sasaki, Ulrik L. Andersen, Fumihiko Kannari

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne detector, and thus is experimentally feasible. In practice, a superposition of coherent states is transformed into a classical mixture of coherent states by linear loss, which is usually the dominant decoherence mechanism in optical systems. We also address the possibility of producing a larger amplitude superposition state from decohered states, and show that in most cases the decoherence of the states are amplified along with the amplitude.

Original languageEnglish
Article number042304
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume73
Issue number4
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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