以冷原子系統進行量子光的產生與儲存

Quantum light generation and storage using cold atomic ensemble

李傳毅(Chuan-Yi Li)

指導教授 ： 褚志崧

國立清華大學/理學院/物理學系/碩士(2018年)

摘要

對於量子資訊而言，非古典光扮演了很重要的角色。為了實現利用量子資訊建
立的網絡，許多學者們正研究著單光子源和糾纏光子的物理性質。本篇論文主要
展示在自發四波混頻(spontaneous Four-Wave-Mixing ,sFWM)的機制下利用冷原
子產生時間-能量糾纏光子對(Time-energy entangle photon pairs)的理論以及
目前為止的實驗結果。我們利用銣87 產生的磁光陷阱(Magneto-optical
trap,MOT)進行實驗。
除了利用冷原子製備非古典光子對外，我們也嘗試利用DLCZ 架構進行量子
記憶(Quantum memory)的相關實驗，並簡單呈現到目前為止我們在實驗上的觀測
結果。

關鍵字

自發四波混頻 ； 電磁引發透明 ； 冷原子系統 ； 雙光子關聯函數 ； 量子記憶 ； 量子網路

並列摘要

Non-classical light sources play a crucial role for quantum information process.
Therefore ,to realize the quantum information network, many people are working on studies of single photon source or quantum entanglement. In our experiments, we will demonstrate the mechanism of spontaneous Four-Wave-Mixing (sFWM) how we generate time-energy entangled photon pairs using cold atoms and show some results we have so far. We use Rubidium87 (Ru87) to produce Magneto-optical trap(MOT) as our atomic medium. Besides generating nonclassical photon pairs, we also tried to test the quantum memory experiment based on DLCZ protocol, and we’ll briefly mention our experimental observation up to present.

並列關鍵字

spontaneous four-wave mixing ； electromagnetically induced transparency ； cold atomic system ； two-photon correlation function ； quantum memory ； quantum network

參考文獻

[1]Hui YanE and JieFei Chen, Narrowband polarization entangled paired photons with controllable temporal length, Science China Physics, Vol.58, Issue 7,pages1-10-Published April 17, 2015.

[2] Shengwang Du, Jianming Wen and Morton H. Rubin, Narrow-Band Biphoton Generation near Atomic Resonance, JOSA B, Vol. 25, Issue 12,pages C98-C108(2008).

[3] Shanchao Zhang, Ph.D. thesis, Coherent Quantum Interaction between Photons and Atoms, Department of Physics,The Hong Kong University of Science and Technology(2013).

[4] L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, Long-distance quantum communication with atomic ensembles and linear optics, Nature Vol. 414, pages 413–418– Published 22 November 2001.

[5] 楊均偉，碩士論文，以冷原子群產生雙光子之理論與實驗架設，國立清華大學物理系(2017)