QuIC-TAQS: Voltage-Tunable Hybrid Microwave-Acoustic Interconnects for Multi-modal Quantum Memories

量子计算机有望通过解决当前经典超级计算机无法解决的复杂问题，为科学技术的未来带来革命性的变化。到目前为止，已经有几个物理平台被证明是实现通用量子处理器的原型。每一种物理实现都有特定的好处，可以演示量子态的相干操作，同时遭受阻止其可扩展集成的缺陷。许多量子计算任务将从将这些物理上不同的信息处理平台连贯地连接起来的能力中受益匪浅。其中一个这样的应用是量子随机存取存储器(QRAM)，它是许多著名的量子算法的关键组件，允许以量子叠加的方式提取存储的数据。这项研究开发了一种混合QRAM设备，由超导量子比特和高质量的声腔通过高度可调的互连连接在一起。该团队将利用他们在材料科学、纳米制造、量子设备物理和量子信息理论方面的专业知识来构建和优化这个设备。这个项目需要综合的研究、教育和推广努力，以鼓励未被充分代表的群体充分参与量子科学和技术，包括K-12学生和教师的夏令营、课程和推广材料的开发、本科生和研究生的研究和建议，以及博士后指导。尽管QRAM是许多重要应用的核心，例如Grover的搜索算法和在量子计算机上解线性方程组，但它的实验实现仍然难以捉摸。这是因为在构建一个既提供高质量多模式量子存储器又具有高度可控性的系统方面存在挑战。该项目通过将量子计算的领跑者之一-超导Transmon量子比特--与最先进的声谐振器存储器相结合来解决这一长期存在的挑战，后者提供高度紧凑、长寿命的量子信息存储。QRAM或换能器运行所需的相干可切换互连由电压可调谐振器提供，该谐振器集成了一个混合超导体-半导体约瑟夫森结，用于按需调谐谐振频率。这一努力不仅将导致QRAM在实验室中的首次展示，还将显著推动量子转换领域的发展，在量子转换领域，声腔模式因其多功能性和与一系列量子系统的兼容性而被广泛认为是连接不同物理平台的最有前途的方法之一。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Quantum computers are expected to revolutionize the future of science and technology by solving complex problems that are beyond the reach of current classical supercomputers. So far, several physical platforms have been demonstrated as prototypes for implementation of universal quantum processors. Each physical implementation holds specific benefits in demonstrating coherent manipulation of quantum state while suffering downfalls that prevent their scalable integration. Many quantum computing tasks would benefit enormously from the ability to coherently connect those physically distinct information processing platforms. One such application is quantum random access memory (QRAM), a key component in many well-known quantum algorithms that allows stored data to be extracted in quantum superposition. This research develops a hybrid QRAM device composed of superconducting qubits and high-quality acoustic cavities joined together by highly tunable interconnects. The team will draw on their expertise in materials science, nanofabrication, quantum device physics, and quantum information theory to construct and optimize this device. This project entails integrated research, education, and outreach efforts that encourage full participation of underrepresented groups in quantum science and technology, including summer camps for K-12 students and teachers, course and outreach material development, undergraduate and graduate research and advising, and postdoc mentoring.Although QRAM is central to many important applications such as Grover’s search algorithm and solving linear systems of equations on a quantum computer, its experimental implementation has remained elusive. This is due to challenges in building a system that offers both a high-quality multi-mode quantum memory and a high degree of controllability. This project addresses this long-standing challenge by combining one of the frontrunners for quantum computing---superconducting Transmon qubits---with state-of-the-art acoustic resonator memories, which offer highly compact, long-lived quantum information storage. A coherent switchable interconnect needed for QRAM or transduction operation is provided by a voltage-tunable resonator that integrates a hybrid superconductor–semiconductor Josephson junction for on demand tuning of resonance frequency. This effort will not only lead to the first demonstration of QRAM in the laboratory but will also significantly advance the field of quantum transduction, where acoustic cavity modes are widely recognized as one of the most promising ways to connect distinct physical platforms due to their versatility and compatibility with a range of quantum systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.