专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

2. 发明授权

US06430345B1 Method and device for producing a choice of either single photons or pairs of photons in an optical channel 有权
标题翻译：用于在光通道中产生单光子或光子对的选择的方法和装置
公开(公告)号：US06430345B1
公开(公告)日：2002-08-06
申请号：US09463685
申请日：2000-09-27
申请人： Wolfgang Dultz , Gisela Dultz , Helmar A. Becker , Heidrun Schmitzer
发明人： Wolfgang Dultz , Gisela Dultz , Helmar A. Becker , Heidrun Schmitzer
IPC分类号： G02B600
CPC分类号： G02F1/21 , G02F1/39 , G02F3/00 , G02F2001/212 , H04L9/0852
摘要： A method and device for generating a choice of individual photons or photon pairs in an optical channel. The generation of this choice involves generating a two-photon state corresponding to a photon pair and spatially separating the photon pair while preserving the quantum-mechanical correlation, in the event the photons are emitted in a collinear manner. One photon is coupled into one optical channel each, the one channel containing an interferometer with variable optical path-length difference &dgr;1F−&dgr;1S, and the other channel including an optical delay section having the optical length &dgr;1. The channels are spatially reunited through a beam splitter, and an adjustment of the quantities &dgr;1F, &dgr;1S, and &dgr;1 occurs in such a way that the probability K for coincidences between the outputs of the beam splitter is a choice of approximately K=0 or approximately K=1, or approximately a predetermined intermediate value, with K=0 corresponding to a photon pair in one of the output channels of the beam splitter, and K=1 corresponding to two individual photons in both output channels of the beam splitter. With this choice generation, an optical separating filter or gate can be implemented for a choice of one-photon or two-photon states, which is usable in quantum cryptography and as a basic element of a quantum-optical computing machine.
摘要翻译：一种用于在光学通道中产生单个光子或光子对的选择的方法和装置。这种选择的产生涉及在光子以共线方式发射的情况下产生对应于光子对的双光子状态并且在保持光子对的同时保持量子力学相关性而空间分离光子对。一个光子每个耦合到一个光信道中，一个通道包含具有可变光程长度差Δ1F-Δ1S的干涉仪，另一个光通道包括具有光学长度Δ1的光学延迟部分。通道通过分束器在空间上重新团聚，并且量Δ1F，Δ1S和Δ1的调整以这样一种方式发生，使得分束器的输出之间的重合概率K是大约K = 0或大约的选择 K = 1或大致预定的中间值，其中K = 0对应于分束器的输出通道之一中的光子对，并且K = 1对应于分束器的两个输出通道中的两个单独的光子。通过这种选择产生，可以实现光学分离滤波器或栅极用于选择单光子或双光子状态，其可用于量子密码术和作为量子光学计算机的基本元件。

IPRDB

热门服务

关于我们

友情链接

联系方式