Spin-Based Quantum Processor and Spectrometer

本项目旨在实现基于自旋的量子器件的全量子控制。自旋是最通用的量子系统之一，已经在传感、纠缠产生和量子计算机的测试平台中得到了应用。传送的第一个例子，Shor的算法和纠错都是通过旋转完成的。如今，有大量基于量子自旋的传感器被开发用于从医疗设备到导航工具的所有领域。然而，尽管有了这些发展，量子的大部分能力还没有在自旋处理器上实现，因为自旋与它们的控制系统的相互作用非常弱。事实上，它是如此的弱，这是一个很好的近似认为控制是经典的。******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，量子设备将变得更高效、更精确、更敏感。控制器是超导电路，当与自旋相互作用时，可以提供更快的门，并可以根据需要冷却和挤压自旋状态。冷却允许熵的并行去除，这是所有量子设备的关键步骤，也是量子纠错的必要步骤。压缩可以产生纠缠，更精确地感知，是具有连续变量的量子计算的基础。******这一进展为自旋物理学带来了高度的协同性。除了为自旋提供新的控制元素之外，它还打开了大n域的腔量子电动力学（QED）的新领域，或具有大量自旋的自旋/腔物理。我们预计该系统将成为凝聚态物质和材料科学模拟的工具。我们可以通过实验探索的新物理包括理论难以解决的多体物理领域。有了第一个测试平台的例子来探索这种物理应该会带来新的见解。******最后，自旋是一些最相干的量子系统，应该是优秀的光子存储元素。具有高协同性是将它们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.