Sudden change of the geometric quantum discord and quantum coherence in dissipative superconducting circuit systems with the time-dependent electromagnetic field

We investigate the influence of a time-dependent electromagnetic field (TDEF) on the double sudden change of the 1-norm geometric quantum discord (GQD) and sudden change of quantum coherence for superconducting circuit systems under spontaneous emission, where two superconducting qubits are each cou...

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Bibliographic Details
Published in:Physica scripta 2024-09, Vol.99 (9), p.95102
Main Authors: Xiong, Zi-Yu, Xiao, Yong-Jun, Zhang, Ye-Qi, He, Qi-Liang
Format: Article
Language:English
Subjects:
dissipative environment
geometric quantum correlation
sudden change
superconducting circuit systems
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Summary:We investigate the influence of a time-dependent electromagnetic field (TDEF) on the double sudden change of the 1-norm geometric quantum discord (GQD) and sudden change of quantum coherence for superconducting circuit systems under spontaneous emission, where two superconducting qubits are each coupled to their own LC circuit or uniformly coupled to a common LC circuit, respectively. It is shown that the double sudden change of the GQD can be controlled, and the frozen time during which the GQD keeps nearly constant can be lengthened by applying the TDEF. Furthermore, we also find that the TDEF can delay the ‘critical point’ of sudden change for quantum coherence and slow down the decay of quantum coherence. Finally, we explore how the TDEF affects the superconducting circuits system’s information flow by using trace distance and the optimal control scheme is sought by comparing the two coupled modes.
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ad6698