Generation of large-amplitude coherent-state superposition via ancilla-assisted photon subtraction

Hiroki Takahashi, Kentaro Wakui, Shigenari Suzuki, Masahiro Takeoka, Kazuhiro Hayasaka, Akira Furusawa, Masahide Sasaki

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

Abstract

We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon subtraction. The ancillary mode induces quantum interference of indistinguishable processes in an extended space, widening the controllability of quantum superposition at the conditional output. We demonstrate this by a simple time-separated two-photon subtraction from continuous wave squeezed light. We observe the largest CSS of traveling light ever reported without correcting any imperfections, which will enable various quantum information applications with CSS states.

Original languageEnglish
Article number233605
JournalPhysical review letters
Volume101
Issue number23
DOIs
Publication statusPublished - 2008 Dec 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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