arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.11874cond-mat.mtrl-sciphysics.app-ph
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大电场下体硅中磷施主的电子自旋弛豫

Electron spin relaxations of phosphorus donors in bulk silicon under large electric field

Daniel K. Park, Sejun Park, Hyejung Jee, Soonchil Lee

摘要:

通过电场调制施主电子波函数对于基于硅中施主自旋的量子计算架构至关重要。对于实际和可扩展的应用,基于施主的量子位必须在任何现实的实验条件下保持足够长的相干时间。在这里,我们提出了脉冲电子自旋共振研究的纵向$(T_1)$和横向$(T_2)$弛豫时间的磷施主在体硅与不同的电场强度,直到近雪崩击穿在约1.2 T的高磁场和约8 K的低温。我们发现,$T_1$弛豫时间显着减少下,由于电流的大电场,和$T_2$的影响,因为$T_1$过程可以占主导地位的退相干。此外,我们表明,硅中的磁阻效应可以被利用作为一种手段,以打击减少的相干时间。虽然量子位相干时间必须比量子门时间长得多,但是当量子位状态初始化依赖于热平衡时,可以发现电加速的$T_1$是有用的。

英文摘要:

Modulation of donor electron wavefunction via electric fields is vital to quantum computing architectures based on donor spins in silicon. For practical and scalable applications, the donor-based qubits must retain sufficiently long coherence times in any realistic experimental conditions. Here, we present pulsed electron spin resonance studies on the longitudinal $(T_1)$ and transverse $(T_2)$ relaxation times of phosphorus donors in bulk silicon with various electric field strengths up to near avalanche breakdown in high magnetic fields of about 1.2 T and low temperatures of about 8 K. We find that the $T_1$ relaxation time is significantly reduced under large electric fields due to electric current, and $T_2$ is affected as the $T_1$ process can dominate decoherence. Furthermore, we show that the magnetoresistance effect in silicon can be exploited as a means to combat the reduction in the coherence times. While qubit coherence times must be much longer than quantum gate times, electrically accelerated $T_1$ can be found useful when qubit state initialization relies on thermal equilibration.

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