Controlling Electron-Phonon Interaction in Nanocircuits Strong Coupling Regime

声子是凝聚态物质中最基本的激发。声子相互作用强，电子-声子相互作用对技术相关应用具有重要影响。由于声子是电子器件中失相和耗散的重要来源，它们对当前信息技术和未来量子技术应用提出了重大挑战。同时，基于非热声声子也有许多应用。例子包括基于表面声波的声电开关，基于声子超材料的声二极管或超灵敏的纳米机械质量传感器。在本提案中，我们的目标是利用声子在纳米电子量子电路中，以基于受限声子和受限电子的混合量子系统的前景为指导，来设计电子-声子动力学。我们建议在固体中设计声子与电子合作的相干激发。这些激发可以用量子信息编码，声子可以作为固态量子比特之间的互连。在这里，我们将在这个方向上迈出第一步，实现在定制纳米结构中耦合电子和声子的混合量子系统。我们将重点研究放置在高质量声子谐振器中的几个电子耦合量子点中的电子-声子相互作用，旨在达到强耦合状态。在这种装置中，单个电子和单个声子之间的相干相互作用将产生对量子信息应用有用的量子混合态。

Phonons are the most fundamental excitations in condensed matter. Phonons strongly interact and the electron-phonon interaction has important consequences for technologically relevant applications. Because phonons are an important source of dephasing and dissipation in electronic devices, they present major challenges for current information technology and future quantum technology applications. In the mean time, there exist a number of applications based on non-thermal acoustic phonons. Examples include acousto-electrical switches based on surface acoustic waves, acoustic diodes based on phononic metamaterials or ultra sensitive nanomechanical mass sensors. In this proposal we aim at utilizing phonons in nanoelectronical quantum circuits, to engineer the electron-phonon dynamics, guided by the prospect of hybrid quantum systems based on confined phonons and confined electrons. We propose to engineer phonons in cooperation with electrons as coherent excitations in solids. Theseexcitations could be encoded with quantum information and phonons could serve, for instance, as interconnects between solid state qubits. Here we will perform a first step in this direction by realizing hybrid quantum systems coupling electrons and phonons in tailored nanostructures. Our focus will be on the electron-phonon interaction in few electron coupled quantum dots placed in high quality phonon resonators aiming at reaching the strong coupling regime. The coherent interaction between a single electron and a single phonon in such a device will give rise to quantum hybrid states useful for quantum information applications.