arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.2172quant-ph
收藏

量子比特的高场现象

High Field Phenomena of Qubits

J. van Tol, G. W. Morley, S. Takahashi, D. R. McCamey, C. Boehme, M. E. Zvanut

摘要:

电子和核自旋是非常有希望的候选者,可以作为量子比特(qubit)用于拟议的量子计算机,因为自旋自由度与其周围环境相对隔离,并且可以通过脉冲EPR和NMR等进行相干操纵。对于固态自旋系统,基于碳和硅的晶体中的各种形式的杂质被认为是量子位,并且在这种系统中观察到非常长的弛豫速率。我们已经在我们的多频脉冲EPR/ENDOR谱仪中研究了各种在高磁场下的这些系统。高磁场导致氦温度下的大的电子自旋极化,从而引起相对于量子计算感兴趣的各种现象。例如,它允许初始化的电子自旋以及超精细耦合的核自旋在一个明确定义的状态相结合的毫米波和RF辐射;它可以通过消除退相干由于偶极相互作用增加T2弛豫时间;它可以导致新的机制,电子自旋的相干电读出。我们将展示一些例子,这些和其他影响的Si:P,SiC:N,和氮相关的中心在金刚石。

英文摘要:

Electron and nuclear spins are very promising candidates to serve as quantum bits (qubits) for proposed quantum computers, as the spin degrees of freedom are relatively isolated from their surroundings, and can be coherently manipulated e.g. through pulsed EPR and NMR. For solid state spin systems, impurities in crystals based on carbon and silicon in various forms have been suggested as qubits, and very long relaxation rates have been observed in such systems. We have investigated a variety of these systems at high magnetic fields in our multi-frequency pulsed EPR/ENDOR spectrometer. A high magnetic field leads to large electron spin polarizations at helium temperatures giving rise to various phenomena that are of interest with respect to quantum computing. For example, it allows the initialization of the both the electron spin as well as hyperfine-coupled nuclear spins in a well defined state by combining millimeter and RF radiation; it can increase the T2 relaxation times by eliminating decoherence due to dipolar interaction; and it can lead to new mechanisms for the coherent electrical readout of electron spins. We will show some examples of these and other effects in Si:P, SiC:N, and nitrogen-related centers in diamond.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑