| 查看: 119 | 回复: 0 | |||
| 当前主题已经存档。 | |||
yichenliu金虫 (正式写手)
|
[交流]
Spin decoherence in diamond.
|
||
| An excellent heat conductor and electrical insulator, diamond is also a potential host for qubits—the units of quantum information that exist in a superposition of two different states. Previously demonstrated qubits include photons that can be in either of two polarization states, Cooper pairs that can reside on either side of a Josephson junction, and quantum dots with a net spin either up or down. In diamond, removing two neighboring carbon atoms and replacing one of them with a nitrogen atom results in a defect called a nitrogen–vacancy center. Such an NV center has a net electronic spin; can be optically imaged, polarized, and "read out"; and keeps its phase coherence for hundreds of microseconds at room temperature. A team of physicists from the University of California, Santa Barbara, and Ames Lab in Iowa, has now looked in detail at that coherence by watching an individual NV center interact with its environment—a local "spin bath" of randomly substituted nitrogen atoms in the diamond crystal. They found that the coupling between the NV center and the bath, and hence the center's decoherence time, could be finely tuned with an applied magnetic field. A rich variety of dynamical behavior could be accessed, including Rabi oscillations and a resonance "beating" phenomenon. (R. Hanson et al., Science Express, 13 March 2008, doi: 10.1126/science.1155400.) |
回复此楼» 猜你喜欢
人气不行了
已经有10人回复
-
如果此刻你正在为国基感到焦虑，不妨来听听这首《基金之外》
已经有6人回复
-
我面上完蛋了
已经有10人回复
-
能否退出参与的面上项目解除限项
已经有24人回复
-
filecode，4个jtjc了
已经有17人回复
-
没有任何消息-是不是就凉了
已经有6人回复
-
2026国自然函评费到账
已经有19人回复
-
建议基金发布提前给出明确的时间点
已经有16人回复
-
今日不放榜？网传国自然预计 8 月 27 日可查结果
已经有21人回复
-
估计是周四
已经有4人回复
