title: Proposal for coherent coupling of Majorana zero modes and superconducting qubits using the 4π Josephson effect.
abstract: We propose to use an ancilla fluxonium qubit to interact with a Majorana qubit hosted by a topological one-dimensional wire. The coupling is obtained using the Majorana qubit-controlled 4π Josephson effect to flux bias the fluxonium qubit. We demonstrate how this coupling can be used to sensitively identify topological superconductivity, to measure the state of the Majorana qubit, to construct 2-qubit operations, and to implement quantum memories with topological protection.
authors.affiliation: Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: David
authors.initials: D
authors.lastname: Pekker
authors.affiliation: Department of Physics, California Institute of Technology, Pasadena, California 91125, USA and Department of Physics and Astronomy, University of California at Riverside, Riverside, California 92521, USA.
authors.forename: Chang-Yu
authors.initials: CY
authors.lastname: Hou
authors.affiliation: Society of Fellows, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Vladimir E
authors.initials: VE
authors.lastname: Manucharyan
authors.affiliation: Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Eugene
authors.initials: E
authors.lastname: Demler