Non-Classical Radiation Emission By A Coherent Conductor
arXiv:1612.06337 · doi:10.1016/j.crhy.2016.07.004
Abstract
We report experimental evidence that the microwave electromagnetic field generated by a normal conductor, here a tunnel junction placed at ultra-low temperature, can be non-classical. By measuring the quadratures of the electromagnetic field at one or two frequencies in the GHz range, we demonstrate the existence of squeezing as well as entanglement in such radiation. In one experiment, we observe that the variance of one quadrature of the photo-assisted noise generated by the junction goes below its vacuum level. In the second experiment, we demonstrate the existence of correlations between the quadratures taken at two frequencies, which can be stronger than allowed by classical mechanics, proving that the radiation at those two frequencies are entangled.
arXiv admin note: text overlap with arXiv:1410.0552
References in corpus (9)
- Generating Entangled Microwave Radiation Over Two Transmission Lines
- Measurements of the Correlation Function of a Microwave Frequency Single Photon Source
- Path Entanglement of Continuous-Variable Quantum Microwaves
- Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation
- Planck Spectroscopy and the Quantum Noise of Microwave Beam Splitters
- Antibunched photons emitted by a quantum point contact out of equilibrium
- Experimental characterization of Gaussian quantum communication channels
- Experimental Violation Of Bell-like Inequalities By Electronic Shot Noise
- Emission of Microwave Photon Pairs by a Tunnel Junction