研究目的
Investigating the generation of sub-Poissonian fields in a microlaser with scalable photon numbers and reduced photon-number variance.
研究成果
The study demonstrated the generation of sub-Poissonian fields in a microlaser with scalable photon numbers and reduced photon-number variance. The findings suggest an effective pathway to widely scalable near-Fock-state lasing at the macroscopic scale, with potential applications in quantum foundation, quantum information processing, quantum metrology, and quantum optical spectroscopy.
研究不足
The study was limited by the experimental capability in terms of the largest atom number and velocity that could be achieved. The cavity damping effect during the atom-cavity interaction time was also a source of discrepancy between the observed and expected Mandel Q values.
1：Experimental Design and Method Selection:
The study utilized a cavity-QED microlaser operating with hundreds of atoms with well-regulated atom-cavity coupling and interaction time. The photon-number variance and mean photon number were measured under various conditions.
2：Sample Selection and Data Sources:
A supersonic barium atomic beam was collimated and made to traverse the cavity mode. The atoms were excited to the upper lasing level before entering the cavity mode.
3：List of Experimental Equipment and Materials:
A Fabry-Perot type optical cavity, single-photon count modules (SPCM’s), and a high-speed counter electronics based on field-programmable-gate-array boards were used.
4：Experimental Procedures and Operational Workflow:
The second-order correlation function of the microlaser output was measured using Hanbury Brown-Twiss-type measurements with two SPCM’s. The photon detection records were used to calculate the second-order correlation.
5：Data Analysis Methods:
The Mandel Q parameter was obtained from the observed second-order correlation at zero time delay and the mean photon number. The data were analyzed to understand the photon statistics and the scalability of the mean photon number.
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