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Heralded single-photon sources are a standard experimental tool for studying quantum optics and quantum information in few-photon systems. These sources use spontaneous parametric wave mixing to probabilistically emit pairs of photons. One photon of the pair, the heralding photon, is detected to indicate the presence of the other. In theory, the maximal probability of emitting a single pair of photons...
Laser-based frequency combs play an important role in applications as spectroscopy. In the visible and infrared regime devices are already commercially available. Since a lot of rotation and vibration frequencies of gases lie in the THz domain, it is desirable to realize a powerful and broad frequency comb at such frequencies. THz Quantum cascade lasers (QCLs) are able to operate in this frequency...
We present a mid-infrared quantum cascade laser embedded into a micro-strip line for high frequency modulation. Modulating with less than 10mW at the round trip frequency, we observe beat-note injection locking within a range in the order of 1 MHz.
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