Xi Beiyufei 西贝与非

Current research

Jul 2026 – Present

Warm-rubidium-ensemble DLCZ quantum memory

I am currently working on a warm-rubidium-ensemble DLCZ quantum-memory experiment. Following completion of the Sagnac/SMZI optical paths, both clockwise and counterclockwise write–read processes are now operational. Current work focuses on Stokes–anti-Stokes cross-correlation measurements before subsequent entanglement experiments.

Stage 2 · Write–read correlation

Stokes–anti-Stokes cross-correlation measurement

The two counterpropagating processes have been operated and verified independently. TDC coincidence measurements currently reach a Stokes–anti-Stokes cross-correlation of approximately 10, providing an operating baseline for later entanglement measurements.

• Clockwise processIndependent write–read path operational
• Counterclockwise processIndependent write–read path operational
• Cross-correlationg⁽²⁾_S,AS ≈ 10

Current apparatus

Completed milestone · Interferometer preparation

Sagnac phase-stability characterization

Built common-path and displaced Sagnac configurations and characterized their phase stability before commissioning the bidirectional write–read processes.

• Common path · 10 minPhase RMS 3.62 mrad · intensity RSD 0.351%
• Common path · 2 hPhase RMS 3.91 mrad · optical-path RMS 0.494 nm
• Displaced path · 2 hPhase fluctuation ±0.194 rad · visibility 83.66%

Earlier records

1. H. Sun, Q. Feng, J. Li, F. Zheng, L. Peng, S. Li, S. Huang, and Y. Xibei. “Rail Web Buried Defect Location and Quantification Methods in Hybrid High-Order Guided Wave Detection.” IEEE Transactions on Instrumentation and Measurement, 73, 1–12 (2024). DOI · PublisherUndergraduate co-author.
2. H. Zhou, L. Zhang, X. Ma, Y. Xibei, Y. Zheng, Z. Liu, X. Gao, J. Zhang, Z. Liu, and F. Zhang. “Approaching 18% efficiency of ternary layer-by-layer polymer solar cells with alloyed acceptors.” Chemical Engineering Journal, 462, 142327 (2023). DOI · PublisherUndergraduate co-author.