Improvement of entanglement generation rate in frequency-multiplexed quantum repeaters using cavity-enhanced SPDC source

• URL: http://arxiv.org/abs/2604.00434v1
• Date: Wed, 01 Apr 2026 03:29:06 GMT
• Title: Improvement of entanglement generation rate in frequency-multiplexed quantum repeaters using cavity-enhanced SPDC source
• Abstract summary: This study is a theoretical performance evaluation of frequency-multiplexed quantum repeaters based on cSPDC.<n>We show that the heralding probability, which was approximately 0.7% in the single-mode case, increases to about 38% under the condition that the fidelity remains 0.9 or higher.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-rate entanglement generation is essential for the realization of practical quantum repeaters. To this end, frequency multiplexing of the photons employed is an effective approach. In particular, schemes using cavity-enhanced spontaneous parametric down-conversion (cSPDC) as a photon-pair source have been proposed. In this study, toward a theoretical performance evaluation of frequency-multiplexed quantum repeaters based on cSPDC, we derive an approximate expression for the quantum state of the frequency-multiplexed photons, where each frequency mode is treated as an independent two-mode squeezed vacuum (TMSV) state. Using this expression, we calculate the heralding probability and fidelity of entanglement generation for several cases in a single-photon interference scheme using frequency multiplexing with cSPDC. Our results demonstrate that by multiplexing approximately 100 modes, the heralding probability improves to approximately 98% for an elementary link distance $L_\mathrm{EL}=25 \mathrm{km}$, even in scenarios where the fidelity exceeds 0.9 across all modes. Furthermore, for $L_\mathrm{EL}=100 \mathrm{km}$, we show that the heralding probability, which was approximately 0.7% in the single-mode case, increases to about 38% under the condition that the fidelity remains 0.9 or higher. These analytical results demonstrate the effectiveness of employing cSPDC as a photon-pair source for quantum repeaters.

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