芯片离子阱中的离子输运问题研究

Microchip ion trap is one of the most promising physical platforms to realize truly scalable quantum computation. Compared to traditional linear ion trap, its merits are easy to fabricate, favorable to integrate and prone to scale. Transport of ions within microchip ion traps is indispensable component to realize scalable quantum computation. The ultimate goal of ion transport procedures is to reliably move ions between two separate locations in the minimum amount of time while leaving them in the same harmonic motional state that they started in (ideally the ground state). Since the coherence of qubit is an important source of advantage of quantum computation, so the electric states of ion that carry information must keep coherent during the process of transport. Nowadays the full two-dimensional transport of ions with low motional excitation are already experimentally implemented, however, most researches have never involved the effects of transport on the electric state of ions. We are going to study them , then propose new transport protocols that have no or less influence on the coherent electric state. The researches are significant to practical application of quantum computation and hopeful for making our country catch up from behind in the area of quantum computation within microchip ion trap.

芯片离子阱是目前最被看好可能实现真正规模化量子计算的物理平台之一，相较于传统线性离子阱，它具有便于制造、利于集成、易于扩展的优点。要在芯片离子阱中实现规模化的量子计算，离子输运是不可或缺的关键步骤。所谓离子输运，是指离子在任意两个地点间的传输，要求是可靠、快速和无运动加热。量子比特具有相干性是量子计算优越性的重要来源，因此编码信息的离子内态在输运过程中必须保持相干性。目前实验上已经可以做到对离子的全二维控制，并且能够保持很低的运动激发，但大部分的研究并未涉及离子内态所受到的影响。本项目拟对芯片离子阱中离子输运过程中内态的相干性保持这一问题开展研究，希望厘清输运过程对离子内态相干性的影响，并据此设计能较好保持内态相干性的新型输运方案。本项目的研究对于量子计算的真正实用化具有十分重要的意义，同时有可能使我国在芯片离子阱量子计算的研究领域后来居上。