Topological quantum buses: coherent quantum information transfer between topological and conventional qubits

摘要

We propose computing bus devices that enable quantum information to becoherently transferred between topological and conventional qubits. We describea concrete realization of such a topological quantum bus acting between atopological qubit in a Majorana wire network and a conventional semiconductordouble quantum dot qubit. Specifically, this device measures the joint(fermion) parity of these two different qubits by using the Aharonov-Cashereffect in conjunction with an ancilliary superconducting flux qubit thatfacilitates the measurement. Such a parity measurement, together with theability to apply Hadamard gates to the two qubits, allows one to produce statesin which the topological and conventional qubits are maximally entangled and toteleport quantum states between the topological and conventional quantumsystems.