Long-distance quantum communication using concatenated ring graph codes

• URL: http://arxiv.org/abs/2503.19822v2
• Date: Tue, 15 Apr 2025 07:45:47 GMT
• Title: Long-distance quantum communication using concatenated ring graph codes
• Authors: Love Pettersson, Anders S. Sørensen,
• Abstract summary: We propose a one-way quantum repeater architecture based on ringd graph codes and linear optical Bell-state measurements.<n>This allows for long-distance quantum communication at a kHZ rate even in the presence of single qubit error rates.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: To realize long-distance quantum communication, it is crucial to design quantum repeater architectures that can deal with transmission losses and operational errors. Code concatenation of photonic graph codes is a promising way to achieve this; however, existing concatenated codes that can correct both transmission losses and operational errors are extremely hardware-demanding. We propose a one-way quantum repeater architecture based on concatenated ring graph codes and linear optical Bell-state measurements. We construct a scheme to generate the concatenated ring graph codes using quantum emitters, where the number of matter qubits scales linearly with concatenation depth. Furthermore, we devise a measurement strategy at each repeater station with a simple experimental setup where photons are measured in the order that they are created and show that entanglement swapping is fault-tolerant to both transmission losses and operational errors. This allows for long-distance quantum communication ($> 10^4$ km) at a kHZ rate even in the presence of single qubit error rates $\epsilon > 10^{-3}$.

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