Versatile Quantum Multiplexing

尽管我们已经知道半导体界面处的一维电子输运已有25年，但很少有人研究这种器件的复杂集成电路，或者评估不同器件中量子效应的产量和再现性的统计数据，我们已经开发出一种制造完全可寻址的16x16分裂栅晶体管阵列的方法，（也称为量子点接触），我们已经用它来研究这些器件的制造和功能产率，并首次对电子弹道一维电导中的所谓“0.7自旋现象”进行了全面的统计分析。我们正在制造用于泵送电荷的平行门，每次一个电子，以产生可测量的电流。我们也正在开发一种偏置每个分裂门的方法，以便在实验开始之前所有256个都处于阈值。这种能力开辟了一个全新的物理学和现实世界的技术应用领域，我们现在希望充分利用。特别是，我们将能够研究集成电路的许多量子门的电子保持量子相位相干从输入到输出的circuit.In这个建议，我们要把我们的想法向前实现量子计量学的应用，真实的集成电路的例子，展示量子相干性，整个范围的量子相干电子的新的物理性质。我们希望通过检查设备的产量和可重复性来加快关于可开发性的决定，作为初步研究的一个组成部分。由于潜力的存在，我们正在开发小型设施的能力，我们将邀请其他研究小组来使用多路复用器概念，使用我们可以制造的设备和我们正在招标的专用评估设备进行自己的实验。

Although we have known about one-dimensional electron transport at semiconductor interfaces for 25 years, little work has been done to investigate complex integrated circuits of such devices, or to evaluation the statistics of yield and reproducibility of the quantum effects seen in different devices, and so discern if manufacturable circuits might be possible.We have developed a way of making a fully addressable 16x16 array of split-gate transistors (also known as quantum point contacts), and we have used this to study the fabrication and functional yield of these devices, and to make the first full statistical analysis of the so-called '0.7 spin phenomenon' in the ballistic 1D conductance of electrons. We are in the process of making parallel gates used for pumping charge, one electron at a time to produce measureable currents. We are also developing a means of biasing each split gate so that all 256 are at threshold before an experiment starts. This capability opens up a whole new area of physics and real-world technological applications which we now want to exploit to the full. In particular we will be able to study integrated circuits made of many quantum gates where the electrons retain quantum phase coherence from the input to the output of the circuit.In this proposal we want to take our ideas forward to realise quantum metrology applications, examples of real integrated circuits exhibiting quantum coherence throughout, and a whole range of qualitatively new physics of quantum coherent electrons. We want to accelerate the decisions about exploitability by examining yield and reproducibility of devices as an integral part of the initial investigations.Because of the breath of potential, we are developing the capability as a mini-facility and we will invite other research groups to come and use the multiplexer concept to pursue their own experiments with devices we can make and the dedicated evaluation equipment we are bidding for.