In recent years, significant progress has been made in encoding and processing quantum information in the large Hilbert space of boson modes. Mechanical resonators have several practical advantages in this regard, as they confine many high quality factor modes within a small volume and can be easily integrated with different quantum systems. However, creating direct interactions between different mechanical modes that can be used to simulate quantum gates is extremely challenging.
Today, Uwe von L ü pke, Yiwen Chu, and others from ETH Z ü rich in Switzerland reported in Nature Physics the in-situ tunable beam splitter type interactions between several mechanical modes of high overtone bulk acoustic resonators.
Engineering interactions are mediated by parameter driven superconducting Transmon qubits and also exhibit double or triple states customized to couple phonon modes. By utilizing this interaction, the Hong Ou Mandel effect between phonons has been demonstrated. This result lays the foundation for using phonon systems as quantum memory and quantum simulation platforms.
Figure 1: The effect of dual color drive on the Transmon quantum bits coupled to high overtone bulk acoustic wave resonators, HBAR.
Figure 2: Beam splitter interaction between two acoustic modes.
Figure 3: Designing multi-mode coupling by adjusting parameter driving power.
Editor:Sichuan Jinzhongde Science and Technology Research Institute
Source: Today's New Materials
