研究目的
Investigating the generation and interference of time-energy entangled photon pairs from a Doppler-broadened atomic ensemble via collective two-photon coherence.
研究成果
The study successfully demonstrates two-photon interference with time-energy entangled photon pairs from a Doppler-broadened atomic ensemble, achieving a visibility as high as 97%. This work provides important insights into the collective two-photon coherence effect and its applications in quantum optics.
研究不足
The experiment is limited by the coherence time of the two-photon state and the resolution of the coincidence detection system. Potential areas for optimization include improving the coherence time and the sensitivity of the detection system.
1：Experimental Design and Method Selection:
The experiment utilizes an unbalanced Michelson interferometer to demonstrate two-photon interference between time-energy entangled photon pairs generated from Doppler-broadened cascade-type 87Rb atoms. The photon pairs are generated via the SFWM process and the collective two-photon coherence effect.
2：Sample Selection and Data Sources:
The sample consists of Doppler-broadened cascade-type 87Rb atoms. Data is collected through highly time-resolved coincidence detection.
3：List of Experimental Equipment and Materials:
The setup includes an unbalanced polarization-based Michelson interferometer, single-photon detectors (SPD1, SPD2), and a time-correlated single-photon counting (TCSPC) system.
4：Experimental Procedures and Operational Workflow:
Photon pairs are generated in the phase-matched direction from the Doppler-distributed moving atoms and are coherently superposed due to the collective two-photon coherence effect. The interference is measured using the unbalanced Michelson interferometer.
5：Data Analysis Methods:
The two-photon coherence length is determined from the interference pattern, and the visibility of the fourth-order interference is calculated.
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