Colored channels for high-fidelity information transfer and processing between remote multi-branch quantum circuits

Instituto de Física de São Carlos, Universidade de São Paulo - P.O. Box 369, São Carlos, 13560-970, São Paulo, Brazil

Received: 1 July 2013
Accepted: 19 August 2013

Abstract

We present a protocol for high-fidelity information transfer and processing between remote multi-branch nonideal quantum circuits (QCs). A set of outputs of a QC is simultaneously coupled to the corresponding set of inputs of another, remote, QC through a single realistic nonideal data bus (DB). The normal modes of the DB are exploited to induce a Raman-like coupling on each colored output-input channel which enables the circuits to exchange information without effectively exciting the DB. Being only virtually excited, the nonidealities of the DB are substantially weakened, rendering a high-fidelity tunneling-like information transfer and processing between the remote multi-branch QCs.