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arXiv quant-ph/0208040quant-ph
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自旋相关复合--固态量子计算机的电子读出机制

Spin-dependent recombination - an electronic readout mechanism for solid state quantum computers

Christoph Boehme, Klaus Lips

摘要:

结果表明,局域在硅带隙态的电子-空穴对的相干自旋运动会影响载流子复合。基于这种效应,本文提出了Kane提出的硅基固态自旋量子计算机的读出概念。31 P量子位(qbit)通过超精细耦合连接到定域施主电子的自旋。当具有带隙内深处或接近价边的能级的第二定域且单占据的电子态接近时,可以激活31 P核与两个电子态之间的门控交换,这使得施主-深能级对要么保持不变,要么保持不变。|T->-态或将其转变为单重态|S>.由于施主深能级跃迁是自旋相关的,因此深能级是否带电取决于施主核的核自旋取向。因此,可以利用光脉冲序列和光电导测量来读取qbit的状态。

英文摘要:

It is shown that coherent spin motion of electron-hole pairs localized in band gap states of silicon can influence charge carrier recombination. Based on this effect, a readout concept for silicon based solid-state spin--quantum computers as proposed by Kane is suggested. The 31P quantum bit (qbit) is connected via hyperfine coupling to the spin of the localized donor electron. When a second localized and singly occupied electronic state with an energy level deep within the band gap or close to the valence edge is in proximity, a gate controlled exchange between the 31P nucleus and the two electronic states can be activated that leaves the donor-deep level pair either unchanged in a |T->-state or shifts it into a singlet state |S>. Since the donor deep level transition is spin-dependent, the deep level becomes charged or not, depending on the nuclear spin orientation of the donor nucleus. Thus, the state of the qbit can be read with a sequence of light pulses and photo conductivity measurements.

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。

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