Chou C W, Polyakov S V, Kuzmich A, Kimble H J
Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2004 May 28;92(21):213601. doi: 10.1103/PhysRevLett.92.213601. Epub 2004 May 25.
Single photons are generated from an ensemble of cold Cs atoms via the protocol of Duan et al. [Nature (London), ()]]. Conditioned upon an initial detection from field 1 at 852 nm, a photon in field 2 at 894 nm is produced in a controlled fashion from excitation stored within the atomic ensemble. The single-quantum character of field 2 is demonstrated by the violation of a Cauchy-Schwarz inequality, namely w(1(2),1(2)|1(1))=0.24+/-0.05 not > or = 1, where w(1(2),1(2)|1(1)) describes the detection of two events (1(2),1(2)) conditioned upon an initial detection 1(1), with w-->0 for single photons.
通过段等人提出的方案[《自然》（伦敦），（）]，从冷铯原子系综中产生单光子。以在852纳米处对场1的初始探测为条件，场2中处于894纳米的一个光子以可控方式由存储在原子系综中的激发产生。场2的单量子特性通过违反柯西 - 施瓦茨不等式得到证明，即w(1(2),1(2)|1(1)) = 0.24 ± 0.05 不> 或 = 1，其中w(1(2),1(2)|1(1))描述了以初始探测1(1)为条件的两个事件(1(2),1(2))的探测情况，对于单光子w趋近于0。
