Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang, 310036, China.
State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai, 200062, China.
Sci Rep. 2017 Aug 1;7(1):7039. doi: 10.1038/s41598-017-07225-5.
A qudit (d-level quantum system) has a large Hilbert space and thus can be used to achieve many quantum information and communication tasks. Here, we propose a method to transfer arbitrary d-dimensional quantum states (known or unknown) between two superconducting transmon qudits coupled to a single cavity. The state transfer can be performed by employing resonant interactions only. In addition, quantum states can be deterministically transferred without measurement. Numerical simulations show that high-fidelity transfer of quantum states between two superconducting transmon qudits (d ≤ 5) is feasible with current circuit QED technology. This proposal is quite general and can be applied to accomplish the same task with natural or artificial atoms of a ladder-type level structure coupled to a cavity or resonator.
一个 qudit（d 阶量子系统）具有较大的 Hilbert 空间，因此可用于实现许多量子信息和通信任务。在这里，我们提出了一种在两个超导转子 qudit 之间传递任意 d 维量子态（已知或未知）的方法，这两个超导转子与单个腔耦合。仅通过共振相互作用即可实现状态转移。此外，量子态可以在不进行测量的情况下确定性地转移。数值模拟表明，使用当前的电路 QED 技术，在两个超导转子 qudit（d ≤ 5）之间实现量子态的高保真度传递是可行的。该方案具有普适性，可以应用于通过与腔或谐振器耦合的 ladder-type 能级结构的天然或人工原子来完成相同的任务。
