Speaker: Álvaro Pernas
Affiliation: IFF
Date: Wednesday, 4 March 2026 at 12:00
Location: Seminar Room, Serrano 121 (CFMAC)
Quantum networks are the most promising proposal to scale quantum computers in what is known as distributed quantum computation. Superconducting waveguide QED networks have shown to be very effective for distributing quantum information based on the exchange of photons between the nodes of the networks. However, fabrication imperfections of nodes require additional techniques to compensate for the frequency differences, leading to reduced scalability and efficiencies. We present a novel approach to emit and absorb arbitrality detuned photons, allowing for an on-demand and deterministic exchange of quantum information. It leverages the large and good controllability of the light-matter couplings that superconducting circuits provide. Then, we propose a protocol for entanglement distribution between the nodes of the network via emission of fractional photons. Numerical solutions support the feasibility and high-fidelity of both protocols, indicating the new possibilities that detuned single photons bring to quantum networks.
Warning: I wanted to use the seminar as an opportunity to practice for the defence of my bachelor thesis. Since the evaluating professors need not be related to physics, it will be less technical than many of you would like. Nevertheless, you are all invited to come, and after the presentation, I’ll try to answer as best as possible any related questions.