Error-corrected quantum repeaters with Gottesman-Kitaev-Preskill qudits
Frank L. Schmidt, Daniel Miller, Peter van Loock · Physical Review A · 2024
The authors theoretically analyze the performance of long-distance quantum communication protocols, specifically quantum repeaters based on Gottesman-Kitaev-Preskill (GKP) qudits. Previously, only the qubit case has been studied. They construct three quantum repeater schemes and find that, while in most cases any benefits of using higher dimensions is negated by worse error correction, there are some regimes where the use of qubits does increase the secret key rate.