Coherence, purity and correlation for superconducting charge qubits

被引：2

作者：

Berrada, K. ^{[1
]}

Abdel-Khalek, S. ^{[2
,3
]}

Algarni, M. ^{[4
]}

机构：

[1] Imam Mohammad Ibn Saud Islamic Univ IMSIU, Coll Sci, Dept Phys, POB 90950, Riyadh 11432, Saudi Arabia

[2] Taif Univ, Coll Sci, Dept Math & Stat, POB 11099, Taif 21944, Saudi Arabia

[3] Sohag Univ, Fac Sci, Dept Math, Sohag 82524, Egypt

[4] Princess Nourah Bint Abdulrahman Univ, Coll Sci, Dept Math Sci, POB 84428, Riyadh 11671, Saudi Arabia

来源：

RESULTS IN PHYSICS | 2023年 / 48卷

关键词：

Superconducting qubit; Thermal density matrix; Thermal coherence; Degree of mixedness; Thermal correlation; MACROSCOPIC QUANTUM STATES; PAIR;

D O I：

10.1016/j.rinp.2023.106414

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In a model consisting of two superconducting charge qubits (SC-Qs), we study how the Josephson energy (JE) and temperature have an influence on the coherence, the degree of mixedness, and the nonclassical correlation. In this example, we show how the quantumness metrics change depending on the JE and the temperature. We also show that the number of quantifiers can be controlled by appropriate selection of the JE of the SC-Q and temperature effect. Additionally, we determine the optimal conditions required to enhance and preserve the coherence and maintain the level of coherence in the existence of temperature variations. We observe important quantum phenomena, i.e., coherence trapping and the quantum correlation trapping. Furthermore, we explain the variations in the coherence based on the degree of mixedness in the superconducting qubit state.

引用

页数：5