Photon scattering from atoms in an atom interferometer: Coherence lost and regained.
Photon scattering from atoms in an atom interferometer: Coherence lost and regained.
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DOI：
10.1103/physrevlett.75.3783
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发表时间：
1995-11
影响因子：
8.6
通讯作者：
Michael Chapman;T. Hammond;A. Lenef;J. Schmiedmayer;R. Rubenstein;Edward T. Smith;D. E. Pritchard
中科院分区：
文献类型：
--
作者：
Michael Chapman;T. Hammond;A. Lenef;J. Schmiedmayer;R. Rubenstein;Edward T. Smith;D. E. Pritchard
一个系统A中由于与储层M纠缠或相关而导致的相干性损失一直是量子力学中的一个重要问题。这是一个特别有趣的问题，因为很难将相干损失纳入描述系统A的薛定谔方程中，也因为它与理解测量过程有关，特别是量子力学和经典力学之间的联系。我们在这里讨论的实验中，这种纠缠是由原子在原子干涉仪内最初处于扩展空间相干状态的光子的弹性散射造成的。讨论的主要问题是连贯性丧失的程度(即。干涉条纹的对比)，两者都是当出射光子被忽略(即。当从原子的最终动量推断出其最终状态的信息时，将其视为储层。这个推论是准确的，因为动量（和能量）是守恒的，光子和原子的初始动量都是很好地指定的。
Loss of coherence in one system A that results from entanglement or correlation with a reservoir M has long been an important issue in quantum mechanics. It is of special interest both because of the difficulty of incorporating the resulting coherence loss into Schrodinger’s equation describing system A and because of its relevance to understanding the measurement process in particular and the connection between quantum mechanics and classical mechanics in general [1]. We discuss experiments here in which this entanglement results from the elastic scattering of a photon from an atom initially in a state with extended spatial coherence inside an atom interferometer. The major issues addressed are the degree of loss of coherence (ie. contrast of the interference fringes), both when the outgoing photon is ignored (ie. treated as a reservoir) and when information about its final state is inferred from the final momentum of the atom. This inference is exact since momentum (and energy too) is conserved and the initial momentum of both photon and atom are well specified.