A silicon-based single-electron interferometer coupled to a fermionic sea
A silicon-based single-electron interferometer coupled to a fermionic sea
复制标题
DOI：
10.1103/physrevb.97.045405
复制
发表时间：
2018-01-03
影响因子：
3.7
通讯作者：
Gonzalez-Zalba, M. Fernando
中科院分区：
文献类型：
--
作者：
Chatterjee, Anasua;Shevchenko, Sergey N.;Gonzalez-Zalba, M. Fernando
我们使用与费米子海耦合的电荷量子位隧道在投影读出的影响下研究朗道-齐纳-斯塔克伯格-马约拉纳 (LZSM) 干涉测量。这使我们能够表征强驱动状态下相干电荷量子位动力学。该器件在硅互补金属氧化物半导体 (CMOS) 晶体管内实现。我们首先通过测量通过门耦合到量子系统的高频电谐振器的色散响应，以连续非破坏的方式读出系统的电荷状态。通过在避免交叉的量子位周围执行多次快速通道，我们观察到了多通道 LZSM 干涉测量图案。在较大的驱动幅度下，实现了对偶校验电荷态的投影测量，显示出色散读出信号的强烈增强。在更大的驱动幅度下，在相干演化中实现了两个投影测量，导致干涉图案消失。我们的结果展示了一种增加相干量子系统的状态读出信号并在 CMOS 晶体管内复制光学干涉测量的单电子模拟的方法。
We study Landau-Zener-Stuckelberg-Majorana (LZSM) interferometry under the influence of projective readout using a charge qubit tunnel-coupled to a fermionic sea. This allows us to characterize the coherent charge-qubit dynamics in the strong-driving regime. The device is realized within a silicon complementary metal-oxide-semiconductor (CMOS) transistor. We first read out the charge state of the system in a continuous nondemolition manner by measuring the dispersive response of a high-frequency electrical resonator coupled to the quantum system via the gate. By performing multiple fast passages around the qubit avoided crossing, we observe a multipassage LZSM interferometry pattern. At larger driving amplitudes, a projective measurement to an even-parity charge state is realized, showing a strong enhancement of the dispersive readout signal. At even larger driving amplitudes, two projective measurements are realized within the coherent evolution resulting in the disappearance of the interference pattern. Our results demonstrate a way to increase the state readout signal of coherent quantum systems and replicate single-electron analogs of optical interferometry within a CMOS transistor.