研究目的
To develop a narrow-band single-photon light source compatible with optical quantum memory devices based on rare-earth-doped dielectric crystals.
研究成果
The experimental demonstration of a narrow-band single-photon light source based on SPDC in a single-resonant OPO shows compatibility with quantum memories based on Nd3+-doped isotopically pure Y7LiF4 crystals. The source's wavelength can be tuned to match optical transitions of dopant ions, and its operation is facilitated by the single-resonant OPO configuration.
研究不足
The contribution of multiphoton states increases with pump power, and at low pump powers, the contribution of photodetector dark counts is significant. The system's performance is also limited by the resolution time of the detection apparatus.
1：Experimental Design and Method Selection:
The experiment utilized cavity-enhanced spontaneous parametric down-conversion (SPDC) in a periodically poled lithium niobate (PPLN) crystal to generate narrow-band single-photon states. The setup included a single-resonant optical parametric oscillator (OPO) configuration to narrow the SPDC spectrum.
2：Sample Selection and Data Sources:
A PPLN crystal doped with magnesium oxide was used as the nonlinear medium. The crystal was excited by a frequency-doubled cw neodymium laser at 532 nm.
3：List of Experimental Equipment and Materials:
The setup included lenses, cavity mirrors, interference filters, a dichroic mirror, single-photon detectors, and a time-to-digital converter.
4：Experimental Procedures and Operational Workflow:
The pump laser beam was focused into the PPLN crystal, and the generated photon pairs were separated by wavelength. The signal photons were detected in a Brown–Twiss interferometer configuration to measure the second-order autocorrelation function.
5：Data Analysis Methods:
The correlation functions were analyzed to determine the mode bandwidth and cavity finesse, and the photon pair generation rate was calculated.
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