Realization of a single-Cooper-pair Josephson laser
Chen, Fei and Li, Juliang and Armour, A.D. and Brahimi, E. and Stettenheim, Joel and Sirois, A.J. and Simmonds, R.W. and Blencowe, M.P. and Rimberg, A.J. (2014) Realization of a single-Cooper-pair Josephson laser. Physical Review B, 90 . 020506/1-020506/6. ISSN 2469-9969
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.
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