Physics. A strongly driven spin.
Physics. A strongly driven spin.
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物理。
DOI：
10.1126/science.1183659
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Gerardot BD
中科院分区：
文献类型：
--
作者：
Gerardot BD
量子信息处理有可能在基础科学、通信和计算领域开辟新的视野。然而，要实现这一潜力，必须克服一些实验挑战。最重要的是对量子位的控制操作-量子信息的基本构建块。量子比特是任何两能级量子力学系统。在许多固态材料中，量子位无论是基于自旋态、静电荷还是其他性质都会与周围环境发生不必要的耦合。这样的相互作用导致退相干和降低信息。实现现实的量子信息处理需要以比退相干发生快得多的速率操纵两能级系统。在本期的第1520页，Fuchset等人在这个方向上迈出了重要的一步，在金刚石中强烈驱动了单电子自旋。在这个过程中，他们超越了广泛使用的近似旋转波近似（RWA）的限制，并为探索量子动力学开辟了新的途径。
Quantum information processing has the potential to open new horizons in fundamental science, communication, and computing. However, a number of experimental challenges must be overcome to realize this potential. Of primary importance is controlled manipulation of a qubit—the elementary building block of quantum information. A qubit is simply any two-level quantum mechanical system. In many solid-state materials, qubits—whether based on spin states, electrostatic charges, or some other property—suffer unwanted coupling with the surrounding environment. Such interactions lead to decoherence and degrade the information. Implementing realistic quantum information processing requires manipulating the two-level system at a rate much faster than decoherence occurs. On page 1520 of this issue, Fuchset al.take an important step in this direction by strongly driving a single electron spin in diamond. In the process, they surpass the limits of a widely used approximation—the rotating wave approximation (RWA)—and open new avenues for exploring quantum dynamics.