Single-shot detection of spatial quantum correlation in high-gain parametric down-conversion

Ottavia Jedrkiewicz, Yunkun Yiang, Enrico Brambilla, Morten Bache, Alessandra Gatti, Luigi A. Lugiato, Paolo di Trapani

Research output: Contribution to journalJournal articleResearchpeer-review


Using a 1 GW, 1 ps pump laser pulse in high-gain parametric down conversion allows us to detect sub-shot-noise spatial quantum correlation with up to 100 photoelectrons per mode by means of a high efficiency charge coupled device. The statistics is performed in single shot over independent spatial replica of the system. Evident quantum correlations were observed between symmetrical signal and idler spatial areas in the far field. In accordance with the predictions of numerical calculations, the observed transition from the quantum to the classical regime is interpreted as a consequence of the narrowing of the down-converted beams in the very high-gain regime.
Original languageEnglish
JournalPhysical Review Letters
Issue number24
Pages (from-to)243601
Publication statusPublished - 2004
Externally publishedYes


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