Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25/4, 6020, Innsbruck, Austria.
Atominstitut, Technische Universität Wien, 1020, Vienna, Austria.
Nat Commun. 2023 Apr 19;14(1):2242. doi: 10.1038/s41467-023-37375-2.
Quantum information carriers, just like most physical systems, naturally occupy high-dimensional Hilbert spaces. Instead of restricting them to a two-level subspace, these high-dimensional (qudit) quantum systems are emerging as a powerful resource for the next generation of quantum processors. Yet harnessing the potential of these systems requires efficient ways of generating the desired interaction between them. Here, we experimentally demonstrate an implementation of a native two-qudit entangling gate up to dimension 5 in a trapped-ion system. This is achieved by generalizing a recently proposed light-shift gate mechanism to generate genuine qudit entanglement in a single application of the gate. The gate seamlessly adapts to the local dimension of the system with a calibration overhead that is independent of the dimension.
量子信息载体与大多数物理系统一样，自然占据着高维希尔伯特空间。这些高维（qudit）量子系统没有将其限制在两能级子空间内，而是作为下一代量子处理器的强大资源而出现。然而，要利用这些系统的潜力，就需要有效地产生它们之间所需的相互作用。在这里，我们在囚禁离子系统中实验性地演示了高达 5 维的固有两量子比特纠缠门的实现。这是通过将最近提出的光移门机制推广到门的单次应用中，生成真正的 qudit 纠缠来实现的。该门能够与系统的局部维度无缝适应，并且校准开销与维度无关。
