Spin-Based Quantum Processor and Spectrometer

该项目旨在实现对基于自旋的量子器件的完全量子控制。自旋是一些最通用的量子系统，并已在传感，纠缠生成和量子计算机的测试平台中找到应用。第一个远距离传送的例子，肖尔的算法和错误修正都是用旋转来完成的。今天，有大量基于量子自旋的传感器正在开发中，从医疗设备到导航工具。 然而，尽管有这些发展，量子的大部分力量还没有与自旋处理器一起使用，因为自旋与其控制系统的相互作用非常微弱。事实上，这种影响是如此之弱，以至于将这些控制视为经典控制是一个很好的近似。** 我们已经开发了新的控制元件和方案，其中自旋/控制器相互作用很强，并且相互作用是完全量子的。 有了这些新工具，量子设备就能变得更高效、更精确、更灵敏。 控制是超导电路，当与自旋相互作用时，提供更快的门，并可以根据需要冷却和挤压自旋状态。 冷却允许并行去除熵，这是所有量子设备的关键步骤，也是量子纠错的关键步骤。 压缩允许纠缠产生，更精确的传感，并且是连续变量量子计算的基础。 ** 这一进展为自旋物理学带来了高协同性。 除了为自旋提供新的控制元件之外，它还开辟了大N域中的腔量子电动力学（QED）的新领域，或者具有大量自旋的自旋/腔物理学。我们预计该系统将成为凝聚态和材料科学模拟的工具。我们可以通过实验探索的新物理学包括多体物理学领域，这些领域的理论是棘手的。 有了第一个探索这种物理学的试验平台的例子，应该会带来新的见解。最后，自旋是最相干的量子系统之一，应该成为优秀的光子存储元件。 具有高协同性是将这些用于微波存储和潜在的光子转导的途径。 这是通往量子中继器的可能途径。

This project is to implement fully quantum control over spin-based quantum devices. Spins are some of the most versatile quantum systems and have found applications in sensing, entanglement generation, and as testbeds for quantum computers. The first examples of teleportation, Shor's algorithm and error correction were all done with spins. Today there are a wealth of quantum spin-based sensors being developed for everything from medical devices to navigational tools. Yet despite these developments, much of the power of quantum has not been available with spin processors since spins interact only very weakly with their control system. So weakly in fact, that it is a good approximation to think of the controls as classical. ******We have developed new control elements and schemes where the spin/controller interaction is strong and the interaction is fully quantum. Having these new tools enables quantum devices that are more efficient, precise and sensitive. The controls are superconducting circuits and, when interacting with spins, provide faster gates and can cool and squeeze spin states on demand. Cooling allows parallel removal of entropy, a key step for all quantum devices and an essential one for quantum error correction. Squeezing allows entanglement generation, more precise sensing, and is the foundation for quantum computing with continuous variables. ******This advance brings high cooperativity to spin physics. Beyond enabling new control elements for spins it also opens the new area of cavity quantum electrodynamics (QED) in the large-N domain, or spin/cavity physics with lots of spins. We anticipate that this system will become a tool for condensed matter and materials science simulations. The new physics we can experimentally explore include areas of multi-body physics where the theory is intractable. Having a first example of a testbed to explore such physics should bring new insight.******Finally, spins are some of the most coherent quantum systems and should make excellent photon storage elements. Having a high cooperativity is a path to using these for microwave storage and potentially photon transduction. It is a possible path to a quantum repeater.