Direct Measurement of a sin(2𝜑) Current Phase Relation in a Graphene Superconducting Quantum Interference Device
In a Josephson junction, Cooper pairs carry the resistance-free electrical current. The dominant process is traditionally the one with single pairs. We have built a superconducting circuit with graphene Josephson junctions, in which the dominant process involves pairs of Cooper pairs. This has strong consequences on the energy spectrum of the circuit and in the future, one could leverage such findings to build novel types of superconducting qubits protected from decoherence.
Simon Messelot, Nicolas Aparicio, Elie de Seze, Eric Eyraud, Johann Coraux, Kenji Watanabe, Takashi Taniguchi, and Julien Renard
