Gabriel Gasse, Christian Lupien, Bertrand Reulet
The current/voltage fluctuations in the microwave domain generated by a conductor are another point of view of a randomly fluctuating electromagnetic field, equivalent to the light emitted by the filament of a light bulb though at a much lower frequency. Here we report the experimental evidence that the microwave radiation generated by a quantum conductor (a dc+ac biased tunnel junction between normal metals placed at very low temperature) is squeezed, i.e. that the fluctuations on one quadrature can go below that of vacuum. Whereas any classical current in a conductor generates a classical state of light \cite{Glauber}, we demonstrate that a quantum current can emit non-classical light. This offers a novel approach -based on the quantization of the electron charge, at the origin of shot noise- to the generation of quantum states of radiation, which are key for the development of quantum computation and communication.
View original:
http://arxiv.org/abs/1306.3913
No comments:
Post a Comment