88 research outputs found
Intrinsically stable light source at telecom wavelengths
We present a highly stable light source at telecom wavelengths, based on a
short erbium doped fiber. The high stability arises from the high inversion of
the Er3+ion population. This source is developed to work as a stable reference
in radiometric applications and is useful in any application where high
stability and/or a large bandwidth are necessary. The achieved long-term
stability is 10 ppm
Single-photon space-like antibunching
We use heralded single photons to perform an antibunching experiment in which
the clicks at the detectors are spacelike separated events. The idea of such
experiment dates back to the 5th Solvay conference, when it was proposed by
Einstein as an expression of his concerns about quantum theory
Measuring absolute spectral radiance using an Erbium Doped Fibre Amplifier
We describe a method to measure the spectral radiance of a source in an
absolute way without the need of a reference. Here we give the necessary detail
to allow for the device to be reproduced from standard fiber-optic components.
The device is suited for fiber-optic applications at telecom wavelengths and
calibration of powermeters and spectrometers at light levels from 1nW to 1uW
A study on the action of non-Gaussian noise on a Brownian particle
AbstractWe analytically address the non-equilibrium problem of a Brownian particle in contact with a thermal reservoir by means of a non-Gaussian Langevin noise term η(t). The presence of noise kurtosis is akin to a second temperature reservoir acting on the system, and we exploit its consequences by means of studying a converging exact form for the stationary probability distribution
Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths
We report on the generation of indistinguishable photon pairs at telecom
wavelengths based on a type-II parametric down conversion process in a
periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase
matching, pump laser characteristics and coupling geometry are optimised to
obtain spectrally uncorrelated photons with high coupling efficiencies. Four
photons are generated by a counter- propagating pump in the same crystal and
anlysed via two photon interference experiments between photons from each pair
source as well as joint spectral and g^(2) measurements. We obtain a spectral
purity of 0.91 and coupling efficiencies around 90% for all four photons
without any filtering. These pure indistinguishable photon sources at telecom
wavelengths are perfectly adapted for quantum network demonstrations and other
multi-photon protocols
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