双步频率转换后单光子的锁定检测。
Lock-in detection of single photons after two-step frequency conversion.
机构信息
Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Saarbrücken 66123, Germany.
出版信息
Opt Lett. 2012 Oct 15;37(20):4254-6. doi: 10.1364/OL.37.004254.
PMID:23073428
Abstract
We report on cascaded frequency conversion at the single-photon level, consisting of a downconversion from the red (738 nm) to a telecom band (1403 nm) and the reverse upconversion process in the same nonlinear crystal. Detecting the converted single photons suffers from a large noise floor. We were able to recover the signal by implementing a lock-in analyzer technique in the data postprocessing.
摘要
我们报告了在单光子水平上的级联频率转换，包括从红色（738nm）向下转换到电信波段（1403nm）以及在同一非线性晶体中反向上转换过程。在检测转换后的单光子时，会受到较大的噪声基底的影响。我们通过在数据后处理中实现锁相放大器技术，成功地恢复了信号。
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