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Atomic homodyne detection of continuous-variable entangled twin-atom states

机译：连续变纠缠双原子态的原子零差检测

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摘要

Historically, the completeness of quantum theory has been questioned using the concept of bipartite continuous-variable entanglement. The non-classical correlations (entanglement) between the two subsystems imply that the observables of one subsystem are determined by the measurement choice on the other, regardless of the distance between the subsystems. Nowadays, continuous-variable entanglement is regarded as an essential resource, allowing for quantum enhanced measurement resolution, the realization of quantum teleportation and quantum memories, or the demonstration of the Einstein-Podolsky-Rosen paradox. These applications rely on techniques to manipulate and detect coherences of quantum fields, the quadratures. Whereas in optics coherent homodyne detection of quadratures is a standard technique, for massive particles a corresponding method was missing. Here we report the realization of an atomic analogue to homodyne detection for the measurement of matter-wave quadratures. The application of this technique to a quantum state produced by spin-changing collisions in a Bose-Einstein condensate reveals continuous-variable entanglement, as well as the twin-atom character of the state. Our results provide a rare example of continuous-variable entanglement of massive particles. The direct detection of atomic quadratures has applications not only in experimental quantum atom optics, but also for the measurement of fields in many-body systems of massive particles.
机译：历史上，一直使用二分连续变量纠缠的概念来质疑量子理论的完整性。两个子系统之间的非经典相关性（纠缠）表明，一个子系统的可观察性由另一个子系统的测量选择确定，而与子系统之间的距离无关。如今，连续变量纠缠已被视为必不可少的资源，它可以实现量子增强的测量分辨率，实现量子隐形传态和量子记忆，或者证明爱因斯坦-波多尔斯基-罗森悖论。这些应用依靠技术来操纵和检测量子场的相干，即正交。在光学系统中，正交相干零差检测是一种标准技术，而对于大颗粒，则缺少相应的方法。在这里，我们报告了一种用于零差检测的原子模拟的实现，用于测量物波正交。该技术在玻色-爱因斯坦凝聚物中自旋改变碰撞产生的量子态的应用揭示了连续可变的纠缠以及该态的双原子特征。我们的研究结果提供了一个罕见的连续变化的大颗粒纠缠实例。原子正交的直接检测不仅在实验量子原子光学中具有应用，而且还用于测量大颗粒多体系统中的场。

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  • 来源
    《Nature》 |2011年第7376期|p.219-223|共5页
  • 作者

    C. Gross; H. Strobel; E. Nicklas; T. Zibold; N. Bar-Gill; G. Kurizki; M. K. Oberthaler;

  • 作者单位

    Kirchhoff-lnstitut fur Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227,69120 Heidelberg, Germany;

    Kirchhoff-lnstitut fur Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227,69120 Heidelberg, Germany;

    Kirchhoff-lnstitut fur Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227,69120 Heidelberg, Germany;

    Kirchhoff-lnstitut fur Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227,69120 Heidelberg, Germany;

    Weizmann Institute of Science, Rehovot 76100, Israel,Harvard-Smithsonian CfA, Harvard University Department of Physics, Cambridge, Massachusetts 02138, USA;

    Weizmann Institute of Science, Rehovot 76100, Israel;

    Kirchhoff-lnstitut fur Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227,69120 Heidelberg, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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