Feasibility of logical Bell state generation in memory assisted quantum networks
Year: 2025
Type: article
Abstract: This study explores the feasibility of utilizing quantum error correction to generate and store logical Bell states in heralded quantum entanglement protocols, crucial for quantum repeater networks. Two lattice surgery-based protocols (local and nonlocal) are introduced to establish logical Bell states between distant nodes using an intermediary node. We simulate the protocols using realistic experimental parameters, including ion trap memories, noisy optical channels, frequency conversion, and nondestructive detection of photonic qubits. The study evaluates rotated and planar surface codes alongside Bacon-Shor codes for small code distances ( d = 3 , 5 ) under depolarizing and physical noise models. Pseudothresholds are identified, with physical error rates above p err ∼ 10 − 3 offering no advantage over unencoded Bell states under depolarizing noise. Pseudo-thresholds are also reevaluated in terms of gate error rates p err H , p err C X , and p err M . For a distance of 1 km between the end node and the intermediary, an advantage over unencoded Bell-state heralded protocols requires reducing gate error rates by an order of magnitude ( 0.1 p err H , 0.1 p err C X , and 0.1 p err M ). These results highlight the need for significant hardware improvements to implement logical Bell state protocols with quantum memories. Additionally, the nonlocal protocol rate was analyzed achieving rates up to ( 32.53 ± 1.53 ) Hz over distances of 1 to 80 km between the end node and the intermediary node.
Source: Physical Review Research
DOI: 10.1103/rsrk-c7yg
Authors: Vladlen Galetsky, Nilesh Vyas, Alberto Comin, Janis Nötzel
Institution: Technical University of Munich
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Awards: G1062995055, Verbundprojekt: Quantenkommunikation für Internet-of-Things-Netzwerke - QUIET -, G1305463392, G177143538, Verbundprojekt: Quanten Drahtloses Campusnetzwerk - QD-CamNetz - , Teilvorhaben: TP-Boche: Quantenklassische Verbindungen, TP-Deppe: Quantenklassischen Verbindungsschicht Protokolle, TP-Nötzel: Quantenklassiche Simulations/Emulations-Plattform, Verbundprojekt: Digitale Transformation und Souveränität künftiger Kommunikationsnetze - 6G-life -, Teilvorhaben: Grundlagen und Systemlösungen für Post Shannon Kommunikation, In-Network Computing, eingebettete Sicherheit und Resilienz, G3563359340, G3690431148, G5018688533, G5519890835, Verbundprojekt: Quantum Physical Layer Service Integration - QuaPhySI -, Teilvorhaben: Netzkonzepte und Theoretische Grundlagen, G7472567491, Verbundprojekt: Quantentoken Theorie und Anwendungen - QTOK -, Teilvorhaben: Modellierung und Simulation für Quantentoken-basierte Authentifizierung und sichere Speicherung
OpenAlex ID: W4410427337