Shaping frequency-tunable single photons for quantum networking in waveguide QED

TL;DR

This paper develops a theoretical framework for shaping frequency-tunable single photons in waveguide QED, enabling deterministic quantum communication and entanglement between non-resonant nodes in quantum networks.

Contribution

It introduces control protocols for arbitrarily detuned single photons, facilitating scalable quantum networking with frequency diversity.

Findings

Protocols enable high-fidelity frequency-selective state transfer

Theoretical analysis identifies regimes suitable for experimental implementation

Numerical simulations demonstrate effective remote entanglement generation

Abstract

The exchange of quantum information among nodes in a quantum network is one of the main challenges in modern technologies. Superconducting waveguide QED networks hold great potential for realizing distributed quantum computation, where distinct nodes communicate via itinerant single photons. Yet, different frequencies among the nodes restrict their applicability and limit scalability. Here we derive the controls required to shape single photons arbitrarily detuned with respect to their natural frequency, allowing thus for an on-demand and deterministic exchange of quantum information among frequency detuned nodes. We provide a theoretical framework, analyzing the properties of the controls for typical photon shapes, identifying operation regimes amenable for experimental realization. We then show how these controls enable frequency-selective quantum state transfer among non-resonant and distant nodes of a realistic network. In addition, we also provide a simple extension for remote entanglement generation between these nodes. The suitability and high-fidelity of these protocols is supported by numerical simulations, highlighting the novel networking possibilities unlocked when shaping frequency-tunable single photons.