We report on the experimental realization and characterization of anasynchronous heralded single photon source based on spontaneous parametric downconversion. Photons at 1550nm are heralded as being inside a single-mode fiberwith more than 60% probability, and the multi-photon emission probability isreduced by up to a factor 600 compared to poissonian light sources. Thesefigures of merit, together with the choice of telecom wavelength for theheralded photons are compatible with practical applications needing veryefficient and robust single photon sources.
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