Physical Review B - Condensed Matter and Materials Physics
We have embedded a voltage-biased Cooper-pair transistor (CPT) in a high-Q superconducting microwave cavity. When the energy given to a tunneling Cooper pair by the voltage bias is equal to a multiple of the cavity photon frequency, the cavity is pumped to a strongly nonequilibrium state. The cavity photons act back on the CPT, allowing us to enter a regime of strongly correlated electronic-photonic transport. We directly observe the effects of photonic backaction on Cooper-pair transport, and see clear evidence for single-emitter lasing in the form of emission dominated by stimulated transport processes.
Chen, Fei; Li, Juliang; Armour, A. D.; Brahimi, E.; Stettenheim, Joel; Sirois, A. J.; Simmonds, R. W.; Blencowe, M. P.; and Rimberg, A. J., "Realization of a Single-Cooper-Pair Josephson Laser" (2014). Open Dartmouth: Faculty Open Access Articles. 3145.