Microwave spectroscopy of a Cooper pair beam splitter
arXiv:1205.2252 · doi:10.1103/PhysRevB.86.075107
Abstract
This article discusses how to demonstrate the entanglement of the split Cooper pairs produced in a double-quantum-dot based Cooper pair beam splitter (CPS), by performing the microwave spectroscopy of the CPS. More precisely, one can study the DC current response of such a CPS to two on-phase microwave gate irradiations applied to the two CPS dots. Some of the current peaks caused by the microwaves show a strongly nonmonotonic variation with the amplitude of the irradiation applied individually to one dot. This effect is directly due to a subradiance property caused by the coherence of the split pairs. Using realistic parameters, one finds that this effect has a measurable amplitude.
12 pages, 5 figures
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- Spin filtering and entanglement detection due to spin-orbit interaction in carbon nanotube cross-junctions
- Nonadiabatic corrections to fast dispersive multiqubit gates involving Z control
- Probing coherent Cooper pair splitting with cavity photons
- Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter
- Cooper pair splitter in a photonic cavity: Detection of Andreev scatterings