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Despite intense efforts during the last 25 years, the physics ofunconventional superconductors, including the cuprates with a very hightransition temperature, is still a controversial subject. It is believed thatsuperconductivity in many of these strongly correlated metallic systemsoriginates in the physics of quantum phase transitions, but quite diverseperspectives have emerged on the fundamentals of the electron-pairing physics,ranging from Hertz style critical spin fluctuation glue to the holographicsuperconductivity of string theory. Here we demonstrate that the gross energyscaling differences that are behind these various pairing mechanisms aredirectly encoded in the frequency and temperature dependence of the dynamicalpair susceptibility. This quantity can be measured directly via the secondorder Josephson effect and it should be possible employing modern experimentaltechniques to build a `pairing telescope' that gives a direct view on theorigin of quantum critical superconductivity.

Observing the origin of superconductivity in quantum critical metals