论文标题
基于嘈杂的离子Qudits的量子断层扫描
Quantum tomography of noisy ion-based qudits
论文作者
论文摘要
量子断层扫描使得获得有关量子计算机某些逻辑元素的综合信息。在这方面，它是调试量子计算机的有前途的工具。但是，层析成像的实际应用仍然受系统的测量错误的限制。它们的主要来源是量子状态准备和测量程序中的错误。在这项工作中，我们研究了基于离子的Qudits的可能性抑制这些错误的可能性。首先，我们将证明一个人可以构建一个量子测量协议，该协议不超过每个测量电路中的单个量子操作。这种协议对错误比相互无偏基的测量值更强大，因为操作的数量与Qudit维度的平方成比例增加。之后，我们将证明确定和考虑状态初始化和读数错误的可能性。总之，所描述的措施可以显着提高基于实际离子Qudits的量子断层扫描的准确性。
Quantum tomography makes it possible to obtain comprehensive information about certain logical elements of a quantum computer. In this regard, it is a promising tool for debugging quantum computers. The practical application of tomography, however, is still limited by systematic measurement errors. Their main source are errors in the quantum state preparation and measurement procedures. In this work, we investigate the possibility of suppressing these errors in the case of ion-based qudits. First, we will show that one can construct a quantum measurement protocol that contains no more than a single quantum operation in each measurement circuit. Such a protocol is more robust to errors than the measurements in mutually unbiased bases, where the number of operations increases in proportion to the square of the qudit dimension. After that, we will demonstrate the possibility of determining and accounting for the state initialization and readout errors. Together, the measures described can significantly improve the accuracy of quantum tomography of real ion-based qudits.
