Fast Entanglement Swapping and Quantum Logic Implementations on a Modular Quantum Computer Prototype

在量子计算领域，信息被编码到量子力学系统中。可以利用这些系统的量子力学特性来处理信息，其速度是经典计算机无法比拟的。量子计算的基本单位是量子比特或量子比特，类似于经典比特。一台有用的量子计算机需要能够处理数百万个这样的量子比特，才能超越它的经典同行。被捕获的原子离子是一个很好的存储量子比特的平台。在过去的几十年里，处理少量的俘获离子已经成为一个可靠的过程，然而，由于各种硬件和工程上的限制，使用这些传统的过程来规模化到大量的量子比特是不可行的。在Universal Quantum，人们正在研究一种用于囚禁离子量子计算机的模块化方法。其目标是能够用单独的模块构建一个大规模的量子计算机，这些模块可以作为独立的单元执行基本的量子操作。在这种方法中，量子逻辑是使用全局场和电信号来实现的，类似于经典芯片上的晶体管的操作方式。我的研究目标是演示和描述量子信息在这些独立模块之间的分布。其目的是使用电子控制信号将量子比特从一个模块传输到相邻模块，同时量子比特保留其编码的量子信息。这一过程的成功演示将是实现大规模基于离子的量子计算机的重要一步。

In the field of quantum computing, information is encoded into quantum mechanical systems. It is possible to employ the quantum mechanical properties of these systems in order to process information at rates that are impossible to match using classical computers. The elementary unit of quantum computing is the qubit or quantum bit, in analogy to the classical bit. A useful quantum computer would need to be able to address millions of such qubits in order to outperform its classical counterpart.Trapped atomic ions are a well established platform to host qubits. Addressing small numbers of trapped ions has become a reliable procedure over the past decades, however it is infeasible to scale to large numbers of qubits using these traditional procedures due to a variety of hardware and engineering limitations. At Universal Quantum a modular approach for a trapped ion quantum computer is pursued. The aim is to be able to construct a large scale quantum computer out of individual modules that can perform basic quantum operations as stand alone units. In this approach quantum logic is implemented using global elds and electrical signals, similar to how transistors on classical chips are operated. My research objective is to demonstrate and characterise the distribution of quantum information in between these individual modules. The aim is to use electrical control signals to transfer qubits from one module to a neighbouring module while the qubits retain their encoded quantum information. A successful demonstration of this process would be a major step towards the realisation of a large scale ion based quantum computer.