本文選題：量子存儲(chǔ) + 壓縮熱態(tài)光場(chǎng)　； 參考：《物理學(xué)報(bào)》2017年07期

【摘要】：光場(chǎng)的量子存儲(chǔ)不僅是構(gòu)建量子計(jì)算機(jī)的重要基礎(chǔ),而且是實(shí)現(xiàn)量子中繼和遠(yuǎn)距離量子通信的核心部分.由于存在不可避免的光學(xué)損耗,光學(xué)參量放大器產(chǎn)生的壓縮真空態(tài)光場(chǎng)將變?yōu)閴嚎s熱態(tài)光場(chǎng),不再是最小不確定態(tài).因此,壓縮熱態(tài)光場(chǎng)的量子存儲(chǔ)是實(shí)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(dǎo)透明機(jī)制能夠?qū)崿F(xiàn)量子態(tài)在光場(chǎng)正交分量和原子自旋波之間的相互映射,即受控量子存儲(chǔ).本文根據(jù)量子存儲(chǔ)的保真度邊界,研究了實(shí)現(xiàn)壓縮熱態(tài)光場(chǎng)量子存儲(chǔ)的條件.量子存儲(chǔ)的保真度邊界是通過經(jīng)典手段能夠達(dá)到的最大保真度,當(dāng)保真度大于該邊界時(shí),就實(shí)現(xiàn)了量子存儲(chǔ).通過數(shù)值計(jì)算分析了不同情況下壓縮熱態(tài)光場(chǎng)的量子存儲(chǔ)保真度邊界,以及存儲(chǔ)保真度隨存儲(chǔ)效率的變化關(guān)系,得到了實(shí)現(xiàn)量子存儲(chǔ)的條件,為連續(xù)變量量子存儲(chǔ)實(shí)驗(yàn)設(shè)計(jì)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(xué)光電研究所量子光學(xué)與光量子器件國(guó)家重點(diǎn)實(shí)驗(yàn)室;山西大學(xué)極端光學(xué)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(批準(zhǔn)號(hào):2016YFA0301402) 國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11322440,11474190,11304190) 霍英東教育基金 山西省自然科學(xué)基金(批準(zhǔn)號(hào):2014021001) 山西三晉學(xué)者項(xiàng)目 山西省回國(guó)留學(xué)人員科研資助項(xiàng)目資助的課題~~
【分類號(hào)】：O431.2

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