Detecting noise with shot noise using on-chip photon detector

Abstract : The high-frequency radiation emitted by a quantum conductor presents a rising interest in quantum physics and condensed matter. However, its detection with microwave circuits is challenging. Here, we propose to use the photon-assisted shot noise for on-chip radiation detection. It is based on the low-frequency current noise generated by the partitioning of photon-excited electrons and holes, which are scattered inside the conductor. For a given electromagnetic coupling to the radiation, the photon-assisted shot noise response is shown to be independent on the nature and geometry of the quantum conductor used for the detection, up to a Fano factor, characterizing the type of scattering mechanism. Ordered in temperature or frequency range, from few tens of mK or GHz to several hundred of K or THz respectively, a wide variety of conductors can be used like Quantum Point Contacts (this work), diffusive metallic or semi-conducting films, graphene, carbon nanotubes and even molecule, opening new experimental opportunities in quantum physics.
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Y. Jompol, P. Roulleau, T. Jullien, B. Roche, I. Farrer, et al.. Detecting noise with shot noise using on-chip photon detector. Nature Communications, Nature Publishing Group, 2015, 6, pp.6130. ⟨10.1038/ncomms7130⟩. ⟨cea-01366527⟩

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