文献类型：期刊文献

英文题名：Quantum nondemolition measurement of small photon numbers using stored light

作者：Liang, L.[1];Lin, G. W.[1];Hao, Y. M.[1];Niu, Y. P.[1];Gong, S. Q.[1]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2014

卷号：90

期号：5

外文期刊名：PHYSICAL REVIEW A

收录：;EI(收录号：20144600208585);WOS:【SCI-EXPANDED(收录号:WOS:000345413500014)】；

基金：This work was supported by the National Natural Sciences Foundation of China (Grants No. 11204080, No. 11274112, and No. 91321101) and the Fundamental Research Funds for the Central Universities (Grant No. WM1313003).

语种：英文

外文关键词：Light propagation - Light - Light transmission - Phonons

摘要：We propose a scheme for realizing a quantum nondemolition (QND) measurement of a small number of optical photons. Our scheme has two stages: First, we couple a propagating light pulse with fixed photon number to a trapped cold atomic gas within a cavity, such that the pulse is stored within a collective polariton mode. Second, a small-photon-number measurement is engineered by monitoring the cavity-transmission spectrum. Since the polariton mode profile is preserved during the process of detecting the spectrum, photon-number QND measurements could be achieved by retrieving the light pulse from the polariton mode. We also discuss a method which uses QND measurements to generate small-photon Fock states.