<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article  PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="3.0" xml:lang="en" article-type="research article"><front><journal-meta><journal-id journal-id-type="publisher-id">MP</journal-id><journal-title-group><journal-title>Modern  Physics</journal-title></journal-title-group><issn pub-type="epub">2161-0916</issn><publisher><publisher-name>Scientific Research Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.12677/MP.2017.74016</article-id><article-id pub-id-type="publisher-id">MP-21440</article-id><article-categories><subj-group subj-group-type="heading"><subject>MP20170400000_74005667.pdf</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>数学与物理</subject></subj-group></article-categories><title-group><article-title>
 
 
  虚光子过程中的几何相位
  Geometric Phase in an Imaginary Photon Process
 
</article-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>乔</surname><given-names>元新</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>于</surname><given-names>肇贤</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib></contrib-group><aff id="aff1"><addr-line>null</addr-line></aff><aff id="aff2"><addr-line>北京信息科技大学理学院，北京</addr-line></aff><pub-date pub-type="epub"><day>06</day><month>06</month><year>2017</year></pub-date><volume>07</volume><issue>04</issue><fpage>148</fpage><lpage>154</lpage><permissions><copyright-statement>&#169; Copyright  2014 by authors and Scientific Research Publishing Inc. </copyright-statement><copyright-year>2014</copyright-year><license><license-p>This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/</license-p></license></permissions><abstract><p>
 
 
   
   利用Lewis-Riesenfeld不变量理论，研究了推广的含时二能级虚光子过程的 Jaynes-Cummings模型。发现周期情况下的几何相位与光子场的频率、光子和原子之间的耦合系数以及原子跃迁频率无关。 By using the Lewis-Riesenfeld invariant theory, we have studied the geometric phase in a generalized time-dependent Jaynes-Cummings model with imaginary photon process for two-level atoms interacting with light field. It is found that the geometric phase in a cycle case has nothing to do with the frequency of the photon field, the coupling coefficient between photons and atoms, and the atom transition frequency.
    
  
 
</p></abstract><kwd-group><kwd>几何相位，推广的Jaynes-Cummings模型, Geometric Phase</kwd><kwd> Generalized Jaynes-Cummings Model</kwd></kwd-group></article-meta></front><body><sec id="s1"><title>虚光子过程中的几何相位<sup> </sup></title><p>乔元新，于肇贤</p><p>北京信息科技大学理学院，北京</p><p>收稿日期：2017年7月3日；录用日期：2017年7月17日；发布日期：2017年7月21日</p><disp-formula id="hanspub.21440-formula258"><graphic xlink:href="http://html.hanspub.org/file/8-1260226x5_hanspub.png"  xlink:type="simple"/></disp-formula></sec><sec id="s2"><title>摘 要</title><p>利用Lewis-Riesenfeld不变量理论，研究了推广的含时二能级虚光子过程的 Jaynes-Cummings模型。发现周期情况下的几何相位与光子场的频率、光子和原子之间的耦合系数以及原子跃迁频率无关。</p><p>关键词 :几何相位，推广的Jaynes-Cummings模型</p><disp-formula id="hanspub.21440-formula259"><graphic xlink:href="http://html.hanspub.org/file/8-1260226x6_hanspub.png"  xlink:type="simple"/></disp-formula><p>Copyright &#169; 2017 by authors and Hans Publishers Inc.</p><p>This work is licensed under the Creative Commons Attribution International License (CC BY).</p><p>http://creativecommons.org/licenses/by/4.0/</p><p><img src="http://image.hanspub.org:8080\Html/htmlimages\1-2890033x\e70a10f1-7c93-45ea-9603-062237856e4b.png" /><img src="http://image.hanspub.org:8080\Html\htmlimages\1-2890033x\e898c85e-ffc4-45c9-b817-14224a4d6960.png" /></p></sec><sec id="s3"><title>1. 引言</title><p>众所周知，几何相位的概念首先由Pancharatnam [<xref ref-type="bibr" rid="hanspub.21440-ref1">1</xref>] 在研究经典光在不同极化状态下的干涉时引入。Berry [<xref ref-type="bibr" rid="hanspub.21440-ref2">2</xref>] 在循环绝热演化的情况下发现了Pancharatnam相的量子对应。Aharonov和Anandan [<xref ref-type="bibr" rid="hanspub.21440-ref3">3</xref>] 对其进行了扩展并发展了非绝对热循环演化。Samuel等人 [<xref ref-type="bibr" rid="hanspub.21440-ref4">4</xref>] 通过将纯态几何相位扩展到非循环演化和顺序投影测量来推广。Mukunda和Simon [<xref ref-type="bibr" rid="hanspub.21440-ref5">5</xref>] 通过将在状态空间中穿过的路径作为几何相位的主要概念给出了运动学方法。在放松绝热，单一性，和进化的周期性的情况下，已经进行了进一步的推广与改进 [<xref ref-type="bibr" rid="hanspub.21440-ref6">6</xref>] 。目前，对在混合状态下的几何相位 [<xref ref-type="bibr" rid="hanspub.21440-ref7">7</xref>] [<xref ref-type="bibr" rid="hanspub.21440-ref8">8</xref>] [<xref ref-type="bibr" rid="hanspub.21440-ref9">9</xref>] 也进行了研究。</p><p>众所周知，Lewis和Riesenfeld提出的量子不变理论 [<xref ref-type="bibr" rid="hanspub.21440-ref10">10</xref>] 是一个有用的工具，可以用来处理与时间相关的哈密顿算子的系统。通过介绍基本不变量的概念，可研究几何相位 [<xref ref-type="bibr" rid="hanspub.21440-ref11">11</xref>] [<xref ref-type="bibr" rid="hanspub.21440-ref12">12</xref>] [<xref ref-type="bibr" rid="hanspub.21440-ref13">13</xref>] [<xref ref-type="bibr" rid="hanspub.21440-ref14">14</xref>] 与相应的与时间相关的薛定谔方程的精确解。Berry相位的发现不仅是旧的量子绝热近似理论的突破，也为我们提供了许多物理现象的新见解。Berry相位的概念已经发展到不同的方向 [<xref ref-type="bibr" rid="hanspub.21440-ref15">15</xref>] - [<xref ref-type="bibr" rid="hanspub.21440-ref27">27</xref>] 。基于Jaynes-Cummings模型 [<xref ref-type="bibr" rid="hanspub.21440-ref28">28</xref>] - [<xref ref-type="bibr" rid="hanspub.21440-ref33">33</xref>] 的研究，并通过使用Lewis-Riesenfeld不变量理论，我们将研究推广的含时二能级虚光子过程的Jaynes-Cummings模型中的几何相位。</p></sec><sec id="s4"><title>2. 物理模型</title><p>推广的含时二能级虚光子过程的Jaynes-Cummings模型的哈密顿量为：</p><disp-formula id="hanspub.21440-formula260"><label>(1)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x9_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中最后一项表示虚拟光子过程，<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x10_hanspub.png" xlink:type="simple"/></inline-formula>光表示光子的湮灭和产生算符。</p><p><inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x11_hanspub.png" xlink:type="simple"/></inline-formula>是定义为<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x12_hanspub.png" xlink:type="simple"/></inline-formula>的原子的赝自旋律算符，<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x13_hanspub.png" xlink:type="simple"/></inline-formula>和<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x14_hanspub.png" xlink:type="simple"/></inline-formula>为Pauli矩阵，<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x15_hanspub.png" xlink:type="simple"/></inline-formula>代表原子和光场之间的耦合强度，<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x16_hanspub.png" xlink:type="simple"/></inline-formula>是电磁波的频率，<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x17_hanspub.png" xlink:type="simple"/></inline-formula>是单位<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x18_hanspub.png" xlink:type="simple"/></inline-formula>时原子的两个能级之间的能量差。</p><p>众所周知，假想的光子被原子以极快的速度吸收。如果我们使用更精确的设备，则可以观察该过程中的几何相位，这是本文的起点。基于这个想法，我们考虑以下系统的哈密顿算子：</p><disp-formula id="hanspub.21440-formula261"><label>(2)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x19_hanspub.png"  xlink:type="simple"/></disp-formula><p>如果引入超对称生成元<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x20_hanspub.png" xlink:type="simple"/></inline-formula>和<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x21_hanspub.png" xlink:type="simple"/></inline-formula></p><disp-formula id="hanspub.21440-formula262"><label>(3)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x22_hanspub.png"  xlink:type="simple"/></disp-formula><p><inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x23_hanspub.png" xlink:type="simple"/></inline-formula>和<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x24_hanspub.png" xlink:type="simple"/></inline-formula>是超对称生成元，形成超对称Lie代数，即：</p><disp-formula id="hanspub.21440-formula263"><label>(4)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x25_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula264"><label>(5)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x26_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula265"><label>(6)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x27_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula266"><label>(7)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x28_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中{，}代表反对易括号。方程(2)变为：</p><disp-formula id="hanspub.21440-formula267"><label>(8)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x29_hanspub.png"  xlink:type="simple"/></disp-formula><p>很容易发现：</p><disp-formula id="hanspub.21440-formula268"><label>(9)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x30_hanspub.png"  xlink:type="simple"/></disp-formula><p>所以我们将研究限定在由运算符构成<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x31_hanspub.png" xlink:type="simple"/></inline-formula>和<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x32_hanspub.png" xlink:type="simple"/></inline-formula>的代数的超对称的准希尔伯特空间下面，我们用特定的特征值<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x33_hanspub.png" xlink:type="simple"/></inline-formula>代替运算符<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x34_hanspub.png" xlink:type="simple"/></inline-formula>。</p></sec><sec id="s5"><title>3. 动力学与几何相位</title><p>为了自洽，我们首先介绍Lewis-Riesenfeld (L-R)的不变理论 [<xref ref-type="bibr" rid="hanspub.21440-ref10">10</xref>] ，对于与时间有关的一维哈密顿<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x35_hanspub.png" xlink:type="simple"/></inline-formula>，存在不变量量算符<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x36_hanspub.png" xlink:type="simple"/></inline-formula>，满足下式方程</p><disp-formula id="hanspub.21440-formula269"><label>(10)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x37_hanspub.png"  xlink:type="simple"/></disp-formula><p>不变量满足特征值方程为</p><disp-formula id="hanspub.21440-formula270"><label>(11)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x38_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x39_hanspub.png" xlink:type="simple"/></inline-formula>，该系统的与时间有关的薛定谔方程为</p><disp-formula id="hanspub.21440-formula271"><label>(12)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x40_hanspub.png"  xlink:type="simple"/></disp-formula><p>根据L-R不变理论，等式(12)的特定解<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x41_hanspub.png" xlink:type="simple"/></inline-formula>与<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x42_hanspub.png" xlink:type="simple"/></inline-formula>的本征函数<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x43_hanspub.png" xlink:type="simple"/></inline-formula>仅相位因子<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x44_hanspub.png" xlink:type="simple"/></inline-formula>的不同，即，</p><disp-formula id="hanspub.21440-formula272"><label>(13)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x45_hanspub.png"  xlink:type="simple"/></disp-formula><p>这表明<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x46_hanspub.png" xlink:type="simple"/></inline-formula>构成等式(12)解的完整集合。那么方程(12)的薛定谔方程的一般解可以写成</p><disp-formula id="hanspub.21440-formula273"><label>(14)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x47_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中</p><disp-formula id="hanspub.21440-formula274"><label>(15)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x48_hanspub.png"  xlink:type="simple"/></disp-formula><p>同时<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x49_hanspub.png" xlink:type="simple"/></inline-formula>。</p><p>对于(8)式的哈密顿描述的系统，我们可以定义下面的不变量</p><disp-formula id="hanspub.21440-formula275"><label>(16)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x50_hanspub.png"  xlink:type="simple"/></disp-formula><p>将方程(8)式和(16)式代入方程(10)式，得到一个辅助方程</p><disp-formula id="hanspub.21440-formula276"><label>(17)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x51_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula277"><label>(18)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x52_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中点表示对时间的导数。</p><p>为了获得与时间无关的不变量，我们可以引入单位变换算子<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x53_hanspub.png" xlink:type="simple"/></inline-formula>。当满足以下关系时，很容易得到</p><disp-formula id="hanspub.21440-formula278"><label>(19)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x54_hanspub.png"  xlink:type="simple"/></disp-formula><p>和</p><disp-formula id="hanspub.21440-formula279"><label>(20)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x55_hanspub.png"  xlink:type="simple"/></disp-formula><p>则可得到与时间无关的不变量</p><disp-formula id="hanspub.21440-formula280"><label>(21)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x56_hanspub.png"  xlink:type="simple"/></disp-formula><p>根据方程(19)式和(20)式，我们选择</p><disp-formula id="hanspub.21440-formula281"><label>(22)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x57_hanspub.png"  xlink:type="simple"/></disp-formula><p>根据方程(22)，方程(16)的不变量<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x58_hanspub.png" xlink:type="simple"/></inline-formula>变为</p><disp-formula id="hanspub.21440-formula282"><label>(23)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x59_hanspub.png"  xlink:type="simple"/></disp-formula><p>利用Baker-Campbell-Hausdoff公式 [<xref ref-type="bibr" rid="hanspub.21440-ref34">34</xref>]</p><disp-formula id="hanspub.21440-formula283"><label>(24)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x60_hanspub.png"  xlink:type="simple"/></disp-formula><p>通过<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x61_hanspub.png" xlink:type="simple"/></inline-formula>当满足下列等式时很容易得到</p><disp-formula id="hanspub.21440-formula284"><label>(25)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x62_hanspub.png"  xlink:type="simple"/></disp-formula><p>有</p><disp-formula id="hanspub.21440-formula285"><label>(26)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x63_hanspub.png"  xlink:type="simple"/></disp-formula><p>因此，我们可以分别获得方程(12)与时间有关的薛定谔方程的两个特定解。对于<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x64_hanspub.png" xlink:type="simple"/></inline-formula></p><p>有</p><disp-formula id="hanspub.21440-formula286"><label>(27)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x65_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中</p><disp-formula id="hanspub.21440-formula287"><label>(28)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x66_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula288"><label>(29)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x67_hanspub.png"  xlink:type="simple"/></disp-formula><p>对于<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x68_hanspub.png" xlink:type="simple"/></inline-formula>，</p><disp-formula id="hanspub.21440-formula289"><label>(30)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x69_hanspub.png"  xlink:type="simple"/></disp-formula><p>其中</p><disp-formula id="hanspub.21440-formula290"><label>(31)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x70_hanspub.png"  xlink:type="simple"/></disp-formula><disp-formula id="hanspub.21440-formula291"><label>(32)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x71_hanspub.png"  xlink:type="simple"/></disp-formula><p>从等式(28)~(29)和(31)~(32)，我们得出结论，当<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x72_hanspub.png" xlink:type="simple"/></inline-formula>时，系统的动力学和几何相位因子分别为<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x73_hanspub.png" xlink:type="simple"/></inline-formula>和<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x74_hanspub.png" xlink:type="simple"/></inline-formula>。特别是当我们考虑参数空间中循环时的一个不变量<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x75_hanspub.png" xlink:type="simple"/></inline-formula>，并且令<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x76_hanspub.png" xlink:type="simple"/></inline-formula>，从式(29)和(32)得出</p><disp-formula id="hanspub.21440-formula292"><label>(33)</label><graphic position="anchor" xlink:href="http://html.hanspub.org/file/8-1260226x77_hanspub.png"  xlink:type="simple"/></disp-formula><p>这里<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x78_hanspub.png" xlink:type="simple"/></inline-formula>表示不变量<inline-formula><inline-graphic xlink:href="http://html.hanspub.org/file/8-1260226x79_hanspub.png" xlink:type="simple"/></inline-formula>的参数空间上的立体角，这意味着几何相位代表了厄米线性束的整体 [<xref ref-type="bibr" rid="hanspub.21440-ref35">35</xref>] 。</p></sec><sec id="s6"><title>4. 结论</title><p>利用Lewis-Riesenfeld不变量理论，研究了推广的含时二能级虚光子过程的Jaynes-Cummings模型。发现周期情况下的几何相位与光子场的频率、光子和原子之间的耦合系数以及原子跃迁频率无关。</p><p>如果有更精确的设备，则可以观察到该虚拟光子过程中的几何相位，并且该过程中的几何相位具有可观察的物理效果。</p></sec><sec id="s7"><title>基金项目</title><p>本文得到北京信息科技大学研究生院项目支持。</p></sec><sec id="s8"><title>文章引用</title><p>乔元新,于肇贤. 虚光子过程中的几何相位Geometric Phase in an Imaginary Photon Process[J]. 现代物理, 2017, 07(04): 148-154. http://dx.doi.org/10.12677/MP.2017.74016</p></sec><sec id="s9"><title>参考文献 (References)</title></sec></body><back><ref-list><title>References</title><ref id="hanspub.21440-ref1"><label>1</label><mixed-citation publication-type="other" 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