Solovykh Irina A, Pashchenko Andrey V, Maleeva Natalya A, Klenov Nikolay V, Tikhonova Olga V, Soloviev Igor I
Lomonosov Moscow State University, Faculty of Physics, Moscow, 119991, Russia.
Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, 119991, Russia.
Beilstein J Nanotechnol. 2025 Sep 11;16:1580-1591. doi: 10.3762/bjnano.16.112. eCollection 2025.
Increasing the efficiency of quantum processors is possible by moving from two-level qubits to elements with a larger computational base. An example would be a transmon-based superconducting atom, but the new basic elements require new approaches to control. To solve the control problem, we propose the use of nonclassical fields in which the number of photons is comparable to the number of levels in the computational basis. Using theoretical analysis, we have shown that (i) our approach makes it possible to efficiently populate on demand even relatively high energy levels of the qudit starting from the ground state; (ii) by changing the difference between the characteristic frequencies of the superconducting atom and a single field mode, we can choose which level to populate; and (iii) even the highest levels can be effectively populated on a sub-nanosecond time scale. We also propose the quantum circuit design of a real superconducting system in which the predicted rapid control of the transmon-based qudit can be demonstrated.
通过从两能级量子比特转向具有更大计算基的元素，可以提高量子处理器的效率。一个例子是基于transmon的超导原子，但新的基本元素需要新的控制方法。为了解决控制问题，我们提议使用非经典场，其中光子数与计算基中的能级数量相当。通过理论分析，我们表明：(i) 我们的方法使得从基态开始能够按需有效地填充甚至相对较高能量的多量子比特能级；(ii) 通过改变超导原子与单个场模式的特征频率之间的差异，我们可以选择填充哪个能级；(iii) 即使是最高能级也可以在亚纳秒时间尺度上有效地填充。我们还提出了一个实际超导系统的量子电路设计，在其中可以演示基于transmon的多量子比特的预测快速控制。
