von Lüpke Uwe, Rodrigues Ines C, Yang Yu, Fadel Matteo, Chu Yiwen
Department of Physics, ETH Zürich, Zurich, Switzerland.
Quantum Center, ETH Zürich, Zürich, Switzerland.
Nat Phys. 2024;20(4):564-570. doi: 10.1038/s41567-023-02377-w. Epub 2024 Jan 25.
In recent years, important progress has been made towards encoding and processing quantum information in the large Hilbert space of bosonic modes. Mechanical resonators have several practical advantages for this purpose, because they confine many high-quality-factor modes into a small volume and can be easily integrated with different quantum systems. However, it is challenging to create direct interactions between different mechanical modes that can be used to emulate quantum gates. Here we demonstrate an in situ tunable beamsplitter-type interaction between several mechanical modes of a high-overtone bulk acoustic-wave resonator. The engineered interaction is mediated by a parametrically driven superconducting transmon qubit, and we show that it can be tailored to couple pairs or triplets of phononic modes. Furthermore, we use this interaction to demonstrate the Hong-Ou-Mandel effect between phonons. Our results lay the foundations for using phononic systems as quantum memories and platforms for quantum simulations.
近年来，在玻色子模式的大希尔伯特空间中对量子信息进行编码和处理方面已经取得了重要进展。为此，机械谐振器具有几个实际优势，因为它们能将许多高品质因数模式限制在小体积内，并且可以很容易地与不同量子系统集成。然而，要在不同机械模式之间创建可用于模拟量子门的直接相互作用具有挑战性。在这里，我们展示了一种在高泛音体声波谐振器的几个机械模式之间的原位可调分束器型相互作用。这种设计的相互作用由参数驱动的超导transmon量子比特介导，并且我们表明它可以被调整以耦合声子模式的对或三元组。此外，我们利用这种相互作用展示了声子之间的洪-欧-曼德尔效应。我们的结果为将声子系统用作量子存储器和量子模拟平台奠定了基础。
