Control and Measurement of Three-Qubit Entangled States
Control and Measurement of Three-Qubit Entangled States
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DOI：
10.1126/science.1097522
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发表时间：
2004-06
期刊：
影响因子：
56.9
通讯作者：
C. Roos;M. Riebe;H. Häffner;W. Hänsel;J. Benhelm;G. Lancaster;C. Becher;F. Schmidt-Kaler;R. Blatt
中科院分区：
文献类型：
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作者：
C. Roos;M. Riebe;H. Häffner;W. Hänsel;J. Benhelm;G. Lancaster;C. Becher;F. Schmidt-Kaler;R. Blatt
我们报告了最大纠缠三量子位态的确定性创造-特别是格林伯格-霍恩-塞林格（GHZ）态和W态-与捕获离子量子计算机。我们选择性地读出其中一个量子位，并展示了局域测量如何影响GHZ和W态。此外，我们还演示了由读出一个量子位的结果控制的条件操作。三部纠缠仅通过局部运算确定地转化为二部纠缠。这些操作是在旋转的基础上测量GHZ状态的一个量子位，并以该测量结果为条件，应用单量子位旋转。
We report the deterministic creation of maximally entangled three-qubit states—specifically the Greenberger-Horne-Zeilinger (GHZ) state and the W state—with a trapped-ion quantum computer. We read out one of the qubits selectively and show how GHZ and W states are affected by this local measurement. Additionally, we demonstrate conditional operations controlled by the results from reading out one qubit. Tripartite entanglement is deterministically transformed into bipartite entanglement by local operations only. These operations are the measurement of one qubit of a GHZ state in a rotated basis and, conditioned on this measurement result, the application of single-qubit rotations.