Entanglement Swapping between Discrete and Continuous Variables
Entanglement Swapping between Discrete and Continuous Variables
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DOI：
10.1103/physrevlett.114.100501
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发表时间：
2015-03-09
影响因子：
8.6
通讯作者：
Furusawa, Akira
中科院分区：
文献类型：
--
作者：
Takeda, Shuntaro;Fuwa, Maria;Furusawa, Akira
我们在实验上实现了离散变量（DV）和连续变量（CV）光学系统之间的“混合”纠缠交换。利用压缩光源和零差探测，通过有效的CV纠缠和操作，可从分束器处分裂的单光子获得DV双模纠缠。交换后的DV纠缠在没有后选择的情况下通过高达0.28 +/- 0.01的对数负性来验证。此外，我们的分析表明，最佳传输状态可以后选到一个高度纠缠的状态，违反Clauser-Horne-Shimony-Holt不等式超过4个标准偏差，因此它可以作为量子隐形传态和量子密码学的资源。
We experimentally realize "hybrid" entanglement swapping between discrete-variable (DV) and continuous-variable (CV) optical systems. DV two-mode entanglement as obtainable from a single photon split at a beam splitter is robustly transferred by means of efficient CV entanglement and operations, using sources of squeezed light and homodyne detections. The DV entanglement after the swapping is verified without postselection by the logarithmic negativity of up to 0.28 +/- 0.01. Furthermore, our analysis shows that the optimally transferred state can be postselected into a highly entangled state that violates a Clauser-Horne-Shimony-Holt inequality by more than 4 standard deviations, and thus it may serve as a resource for quantum teleportation and quantum cryptography.