电路QED中基于多个长寿命固态器件的量子信息处理研究

电路量子电动力学（电路QED）以其良好的可控性和可扩展性被认为是最有希望实现大规模量子信息处理的物理系统之一，其中具有长寿命的超导谐振腔与NV系综等固态器件被认为是量子计算中优良的量子存储器。目前，许多微波量子光学现象与操控已在由单个超导腔或NV系综所构成的电路QED系统中被实验所发现和证实，而在多个固态器件（超导腔或NV系综）电路QED系统中的量子信息处理与计算问题却有待进一步的研究。本项目研究电路QED中基于多个长寿命固态器件（超导腔或NV系综）的量子信息处理问题，具体为:（1）研究基于单个超导比特耦合的多个超导腔和NV系综的量子态制备与操纵；（2）研究基于单个NV系综耦合的多个超导腔的量子态制备与操纵；（3）研究位于不同超导腔内的多个NV系综的量子态的制备与操纵等。众所周知，量子态制备与操纵是实现量子计算的关键要素。本项目研究结果在大规模量子信息处理的实现方面具有重要的理论指导意义。

Due to its controllability and scalability, circuit quantum electrodynamics (QED) has been considered as one of the promising physical systems for realizing large-scale quantum information processing (QIP), in which long-lifetime solid-state devices such as superconducting resonators and NV ensembles have been considered as good quantum memory elements in quantum computation (QC). Numerous microwave quantum optics phenomena and operations have been experimentally demonstrated in a circuit QED system consisting of a superconducting resonator or NV ensembles. However, the QIP and QC in the circuit QED system consisting of multiple solid-state devices (superconducting resonators or NV ensembles) is still needed to be further studied. This project studies QIP in circuit QED based on multiple long-lifetime solid state devices (superconducting resonators or NV ensemble). Specifically, this project focuses on: (1) Study on the generation and manipulation of quantum states of multiple superconducting resonators and NV ensembles coupled to a single superconducting qubit; (2) Study on the generation and manipulation of quantum states of multiple superconducting resonators coupled to a single NV ensembles; (3) Study on the generation and manipulation of quantum states of multiple NV ensembles distributed in different resonators, etc. As is well known, generation and manipulation of quantum states are key elements for realizing QC. The research results of this project give an important theoretical guidance in the realization of large-scale QIP.