發(fā)布時間：2018-05-31 06:40

  本文選題：量子存儲 + 壓縮熱態(tài)光場�。� 參考：《物理學報》2017年07期

【摘要】：光場的量子存儲不僅是構(gòu)建量子計算機的重要基礎,而且是實現(xiàn)量子中繼和遠距離量子通信的核心部分.由于存在不可避免的光學損耗,光學參量放大器產(chǎn)生的壓縮真空態(tài)光場將變?yōu)閴嚎s熱態(tài)光場,不再是最小不確定態(tài).因此,壓縮熱態(tài)光場的量子存儲是實現(xiàn)量子互聯(lián)網(wǎng)的關(guān)鍵.在原子系綜中利用電磁誘導透明機制能夠?qū)崿F(xiàn)量子態(tài)在光場正交分量和原子自旋波之間的相互映射,即受控量子存儲.本文根據(jù)量子存儲的保真度邊界,研究了實現(xiàn)壓縮熱態(tài)光場量子存儲的條件.量子存儲的保真度邊界是通過經(jīng)典手段能夠達到的最大保真度,當保真度大于該邊界時,就實現(xiàn)了量子存儲.通過數(shù)值計算分析了不同情況下壓縮熱態(tài)光場的量子存儲保真度邊界,以及存儲保真度隨存儲效率的變化關(guān)系,得到了實現(xiàn)量子存儲的條件,為連續(xù)變量量子存儲實驗設計提供了直接參考.
[Abstract]:The quantum storage of optical field is not only the important foundation of constructing quantum computer, but also the core part of quantum relay and long-distance quantum communication. Due to the inevitable optical loss, the squeezed vacuum light field produced by the optical parametric amplifier will be changed into the squeezed hot state light field, which is no longer the least uncertain state. Therefore, the quantum storage of squeezed thermal light field is the key to realize quantum Internet. In atomic ensemble, the electromagnetic induced transparency mechanism can be used to realize the mutual mapping of quantum states between the orthogonal components of the light field and the atomic spin waves, that is, controlled quantum storage. Based on the fidelity boundary of quantum storage, the condition of realizing squeezed thermal field quantum storage is studied in this paper. The fidelity boundary of quantum storage is the maximum fidelity that can be achieved by classical means. When the fidelity is greater than this boundary, quantum storage is realized. Through numerical calculation, the quantum storage fidelity boundary of squeezed hot light field and the relation between storage fidelity and storage efficiency are analyzed, and the conditions for realizing quantum storage are obtained. It provides a direct reference for the design of continuous variable quantum storage experiment.
【作者單位】： 山西大學光電研究所量子光學與光量子器件國家重點實驗室;山西大學極端光學協(xié)同創(chuàng)新中心;
【基金】：國家重點研發(fā)計劃(批準號:2016YFA0301402) 國家自然科學基金(批準號:11322440,11474190,11304190) 霍英東教育基金 山西省自然科學基金(批準號:2014021001) 山西三晉學者項目 山西省回國留學人員科研資助項目資助的課題~~
【分類號】：O431.2

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本文編號：1958686