Versatile Quantum Multiplexing

尽管我们对半导体界面上的一维电子传输已有25年的了解，但很少有人研究这类器件的复杂集成电路，或评估不同器件中量子效应的成品率和重现性的统计数据，从而识别可制造电路是否可能。我们开发了一种方法，制作了完全可寻址的16x16分裂栅晶体管阵列(也称为量子点接触)，并利用该方法研究了这些器件的制造和功能成品率，并首次对电子弹道1D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浦电荷的平行栅极，一次一个电子来产生可测量的电流。我们还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个门都达到阈值。这一能力开辟了物理和现实世界技术应用的一个全新领域，我们现在想要充分利用这一领域。特别是，我们将能够研究由许多量子门组成的集成电路，在这些集成电路中，电子从电路的输入到输出保持量子相位相干性。在这个提议中，我们希望将我们的想法向前推进，以实现量子计量学应用，整个真实集成电路展示量子相干性的例子，以及一系列全新的量子相干电子物理学。我们希望通过检查设备的成品率和再现性来加速有关可开发性的决策，作为初始调查的组成部分。由于潜力的呼吸，我们正在开发作为微型设施的能力，我们将邀请其他研究小组前来并使用多路复用器的概念来进行他们自己的实验，使用我们可以制造的设备和我们正在竞标的专用评估设备。

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.