In which is the momentum of a photon larger, in vacuum or in a medium?
光子在真空中的动量大，还是在介质中的动量大？
According to statistical theory, photon and subatomic particle ease make clear into vacuum is only for nothing probably concept: Bestrewed the particle that is in normal and antiparticle among them.
按照统计理论，光子和亚原子粒子逸入真空剖明空只是梗概的概念：其中充满了处于常态的粒子和反粒子。
Some essential concepts such as vacuum, photon particle etc. are newly defined.
重新定义了真空、光子、粒子等重要概念。
A overview of the basic structure, operating principle and properties for a new single-photon photo-detector, called vacuum avalanche photodiode (VAPD), is presented too.
本文着重介绍了半导体雪崩光电二极管(APD)的研究现状和应用，以及一种新型的单光子探测器—真空雪崩光电二极管(VAPD)的结构，原理和特性。
We show that the refular pumping statistics and atomic coherences can reduce the field noise of multiple one photon optical bistability, but can not result in field squeezing from an ordinary vacuum.
证明了亚泊松泵浦及原子的相干性可使多单光子双稳态的光场噪声降低，但不能产生光场的压缩效应。
A method of generating the single-photon entangled states of a single photon state and a vacuum state through utilizing optical beam-splitter and single-photon source is described.
使用光学分束器和单光子源，利用单光子态和真空态制备出了纠缠单光子态。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
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