Superconducting qubit with a quantum memory

本项目的主要目标是实现和研究一种耦合到固定频率超导量子比特上的多模微波量子存储器。有一些现实世界的问题，如生物化学和天体物理学，需要大量的时间使用经典的计算机。因此，基于超导的量子计算机因其解决耗时和极端问题和事件的能力而备受关注。即使这些问题也需要大量的量子比特来解决。然而，来自外部环境的退相干影响弛豫和退相时间，这给可扩展量子计算带来了困难。而简单的增加超导量子比特的数目由于存在退相干等障碍而不是一个可扩展的解决方案，多模微波量子存储器可以存储超导量子比特的量子态.多模微波量子存储器中的单个微波畴光子可以通过微波谐振腔存储超导量子比特的量子态，一旦光子存储了量子比特的态，超导量子比特就可以在必要时检索这些信息。在多模设置中，超导量子比特的量子态可以以不同的模式存储在量子存储器中，这允许量子比特选择性地取回光子并从量子存储器中恢复其量子态。这种多模微波量子存储器将使可扩展的量子计算机成为可能，而不需要简单地制造多个量子比特。

The main goal of this project is to realize and investigate a multimode microwave quantum memorycoupled to a fixed-frequency superconducting qubit. There are real-world problems, such asbiochemistry and astrophysics, which require loads of time by using a classical computer. Therefore,superconducting-based quantum computers have been spotlighted due to their capability to solvetime-consuming and extreme problems and events. Even these problems require numerous qubitsto be solved. However, decoherence from the outer environments that affect the relaxation and thedephasing time brings difficulties in scalable quantum computing. And the simple increment in thenumber of superconducting qubits is not a scalable solution due to obstacles such as decoherence.The multimode microwave quantum memory can store the quantum states of the superconductingqubit. A single microwave domain photon inside the multimode microwave quantum memory canstore the quantum state of a superconducting qubit by helping with a microwave cavity resonator.Once the photon stores the qubit states, the superconducting qubit can retrieve this informationwhen necessary. In the multimode setup, the quantum states of the superconducting qubit can bestored in different modes within the quantum memory, which allows the qubit to selectively retrievethe photon and recover its quantum state from quantum memory. This multimode microwavequantum memory will enable scalable quantum computers without necessitating the simplenanofabrication of multiple qubits.