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High-visibility energy-time entanglement system enabled by low-loss silicon integrated platform
Optics Letters- received 03/27/2024; accepted 04/26/2024; posted 04/26/2024; Doc. ID 525037
- Abstract: Energy-time (E-T) entanglement is widely employed in long-distance quantum entanglement distribution due to its strong robustness against transmission fluctuations. In this letter, we report the first silicon monolithically integrated E-T entanglement system, which integrates the photon sources, wavelength demultiplexers, and Franson interferometers on a single chip. By utilizing low-loss routing and devices, we measured an on-chip quantum interference visibility of 99.66% (±0.47%), one of the highest values for monolithic E-T entanglement systems reported to date. The quantum interference after 1-km and 5-km fiber propagation shows visibilities of 96.72% (±0.78%) and 97.46% (±1. %), respectively. These results demonstrate the potential of using silicon monolithic integration for advance E-T entanglement-based quantum communication networks.