以下为句子列表：
英文: A new method of absolute calibration of photodetector sensitivity based on spontaneous parametric down-conversion(SPDC) biphoton field is described.The process of SPDC is studied theoretically.The single photon detection probability and two-photon coincid
中文: 讨论了一种基于自发参量下转换双光子场绝对校准光电探测器灵敏度的新方法，着重推导了对自发参量下转换过程中产生的单光子的探测概率和双光子的符合速率，从而阐明了绝对测量光电探测器量子效率的原理.基于这一方法对光子计数型光电倍增管的响应灵敏度进行了测量，并将实验结果与常规方法测得的结果进行了比较.
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英文: Abnormal position of the heart within the thoracic cavity may potentially cause cardiac single-photon emission computed tomography (SPECT) perfusion artifacts, and only few such cases have been reported.
中文: 摘要胸腔内心脏位于不正常位置可能导致心脏单光子射出计算机断层造影伪像，且这种病例仅有少数曾被报告过。
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英文: Abstract: By employing the concept of photon flux,the evolution of the phase and photon flux in the eigenmode state in three-wave mixing,and the requirements for the initial phase and photon flux in this state,are studied in the paper.A special state in w
中文: 文摘:利用光子流概念研究了三波混频中本征模状态的相位和光子流的变化，以及该状态对光波的初始相位和初始光子流的要求，研究了三波混频中只有光子流的交换却没有相位变化的特殊状态，提出了本征模状态推拉式非线性光环镜的全光开关，并数值计算了这种全光开关的性能，数值结果表明，该光开关的性能稳定性好，并且易于实现和控制输出信号光的光强及相位.
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英文: Abstract: The atomic quantum behaviors in the system of two-mode squeezed vacuum field interacting with a two-level atom via two-photon process are studied by means of quantum theory.The condition for the occurrence of coherent trapping and the influence
中文: 文摘:运用全量子理论研究了双模压缩真空场与二能级原子双光子作用过程中原子的量子行为，论证了原子发生相干俘获的条件，讨论了压缩参数对原子偶极压缩的影响.
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英文: Abstract: We have studied the spontaneous emission from a three-level atom with an external-driving field in a photonic crystal.As a result of quantum interference and photon localization,the population in the two upper levels displays quasi-oscillatory o
中文: 文摘:讨论了在双光子驱动场作用下，三能级原子在光子晶体中的自发发射问题.由于量子干涉和光的局域化作用，两个上能级中的占据数将具有周期振荡或准周期振荡的性质，这不仅依赖于两个上能级与禁带的相对位置，同时也依赖于原子的初始状态，而且还与驱动场的强度、驱动场的入射位相有关.这些性质既与真空中带有驱动场的原子的自发发射性质不同，也有别于无驱动场作用下光子晶体中三能级原子的自发发射性质.
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