spdc 中文意思是什麼

spdc 解釋
國家和平發展委員會
  1. Experimental results of four - photon de broglie wavelength measurement are analyzed based on a local description for the quantum state and optical field of photon pairs generated from spontaneous parametric down - conversion ( spdc )

    摘要採用對自發參量下轉換過程產生的光子對的量子態和光場的非糾纏態描述，分析了由自發參量下轉換過程產生的四光子的德布羅意波長測量的實驗，得到了與實驗觀測相一致的結果。
  2. In order to get single - photon state and reconstruct its wigner function, the two aspects, spdc of pulse pumped nonlinear phase match type i bbo crystal and reconstruction of wigner function of quantum state, are studied in this thesis. 1

    本文是單光子態制備及其wigner函數重構課題中的部分內容，主要包括兩個方面內容，即脈沖抽運的類非共線相位匹配bbo晶體的自發參量下轉換過程和利用量子層析攝影術重構光量子態的wigner函數。
  3. 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 coincidence probability are derived and the calibration principle for photodetectors is explained. an experimental system has been set up. the sensitivity of a photon - counting photomultiplier tube was measured, and the results were compared with those obtained using conventional method

    討論了一種基於自發參量下轉換雙光子場絕對校準光電探測器靈敏度的新方法，著重推導了對自發參量下轉換過程中產生的單光子的探測概率和雙光子的符合速率，從而闡明了絕對測量光電探測器量子效率的原理.基於這一方法對光子計數型光電倍增管的響應靈敏度進行了測量，並將實驗結果與常規方法測得的結果進行了比較
  4. And the spdc has also been widely studied for its entanglement of time, space, polarization, and energy

    另外，參量下轉換產生的光子對具有時間、空間、偏振、能量等多種糾纏，因而在理論和實驗上都得到了廣泛的研究。
  5. Because spdc creates photons in pairs, if one photon is found in one arm of the twin - photon, we know there must exists a single - photon state in another arm. so, we can assure when the single - photon state generate without detecting it

    其中，自發參量下轉換因其成對的產生下轉換光子，可以通過探測其中之一來確認另一個是否為單光子態，這樣就可以在不破壞單光子的情況下確認單光子的存在。
  6. There are many ways to generate single - photon state, e. g. attenuated laser, quantum dot, pulsed excitation of a single dipole, single nitrogen - vacancy color center in a diamond nanocrystal, cavity - qed and spontaneous parametric down - conversion ( spdc )

    目前有多種方案可以制備單光子態，如直接將激光衰減至單光子水平、量子點、單熒光分子以及金剛石納米顆粒中的n - v色心、腔qed及自發參量下轉換等。
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