| 查看: 111 | 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
309求调剂
已经有8人回复
-
一志愿南航 335分 | 0856 | GPA 4.07 | 有科研经历
已经有8人回复
-
求调剂
已经有5人回复
-
求化学调剂
已经有5人回复
-
085600，材料与化工321分求调剂
已经有10人回复
-
0703 化学 求调剂，一志愿山东大学 342 分
已经有5人回复
-
一志愿南开大学0710生物学359求调剂
已经有3人回复
-
085600，专业课化工原理，320分求调剂
已经有4人回复
-
材料与化工272求调剂
已经有16人回复
-
290求调剂
已经有3人回复
