How to employ microwaves for simulating quantum tunnelling

A W Holleitner, H Qin, F Simmel +5 more

We present measurements on microwave spectroscopy on a double quantum dot with an on-chip microwave source. The quantum dots are realized in the two-dimensional electron gas of an AlGaAs/GaAs heterostructure and are weakly coupled in series by a tunnelling barrier forming an `ionic' molecular state. We employ a Josephson oscillator formed by a long Nb/Al-AlO x /Nb junction as a microwave source. We find photon-assisted tunnelling sidebands induced by the Josephson oscillator, and compare the results with those obtained using an externally operated microwave source.

Daniela Mugnai, Anedio Ranfagni

Daniela Mugnai, Anedio Ranfagni

John R. Tucker, Michael F. Millea

A quantum generalization of microwave mixer theory predicts that superconductive tunneling devices may be employed as ultrasensitive low noise photon detectors at millimeter wave frequencies.

J.T. Chen, R. J. Todd, Y.W. Kim

A. Rettaroli, D. Alesini, D. Babusci +17 more

This manuscript is on the design and development of a single microwave photon counter based on a current-biased Josephson junction aimed at the detection of light axion dark matter. Simulations and measurements of a Josephson junction are presented. We observe the junction in a quantum tunneling regime, with subsequent dissipation on an external RC circuit.