ABSTRACT
While the CPT is topologically identical to the normalstate single-electron transistor (SET), it is operated in the superconducting state, and the superconducting nature of the device modifies the transport properties in several important ways. For our purposes, we also distinguish the CPT from the superconducting single-electron transistor (SSET) as a mode of operating this particular double-junction device. As a CPT, it is operated on the supercurrent branch near zero voltage in the coherent Cooper-pair transport regime, while as an SSET, it is operated at finite voltage bias and can include several incoherent hybrid quasiparticle/Cooper-pair tunneling processes.
