(Color online) (a) Setup for spontaneous emission lifetime measurement on a quantum dot single-photon source. A fast photodiode is used as the start trigger for the timing electronics; the stop is provided by an SSPD. (b) Setup for experiment. A standard Hanbury Brown–Twiss configuration is used with SSPDs at each output. SSPD—superconducting single-photon detector, BS—beamsplitter, and DBS—dichroic beam splitter.
(Color online) Spontaneous emission lifetime of a quantum dot measured with a single SSPD channel. The start clock to timing electronics is provided by a fast photodiode driven directly by the Ti: sapphire pump laser. The carrier lifetime of the source is . The instrument response function (IRF) of the SSPD is a FWHM Gaussian.
(Color online) for a cavity-coupled quantum dot using twin SSPDs. Data binned at intervals. The SSPDs have a detection efficiency (including fiber coupling losses) of 2% per channel. They are biased such that the dark count rate is . The measured .
(Color online) of a diode laser gain switched at measured with twin SSPDs. As expected for a Poissonian source, . The width ( FWHM) of the peaks is dominated by the jitter ( FWHM) of the laser.
Comparison of single-photon counting detectors for measurements on single-photon sources. The dark count probability is calculated per nanosecond. is the offset in the measured value of in the limit where all background counts are due to dark counts. The time for pattern to emerge is calculated with the same experimental statistics calculated with ten source-triggered counts per , at a mean photon number per pulse entering the Hanbury Brown–Twiss of .
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