Waveguide-QED-Based Photonic Quantum Computation

TL;DR

This paper proposes a waveguide-QED scheme for quantum computation using flying photons interacting with matter qubits, enabling high-fidelity photon-photon gates for scalable quantum networks.

Contribution

It introduces a novel approach for photon-based quantum gates using waveguide-QED systems, advancing on-chip quantum network technology.

Findings

High gate fidelity achievable with current superconducting circuit technology

Photon-photon - and CNOT-gates demonstrated in theory

Potential for scalable on-chip quantum networks

Abstract

We propose a new scheme for quantum computation using flying qubits--propagating photons in a one-dimensional waveguide--interacting with matter qubits. Photon-photon interactions are mediated by the coupling to a three- or four-level system, based on which photon-photon \pi-phase gates (Controlled-NOT) can be implemented for universal quantum computation. We show that high gate fidelity is possible given recent dramatic experimental progress in superconducting circuits and photonic-crystal waveguides. The proposed system can be an important building block for future on-chip quantum networks.