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International Conference on Circuit, Systems and Communication (ICCSC)

Non-Locality and Quantum Coherence in Superconducting Qubits

Abdessamie Chhieb, Chaimae Banouni, Mostafa Mansour, M. Ouchrif

Published Jun 19, 2025• 0 citations
Publisher

Abstract

This study examines the influence of temperature and Josephson energy on the quantum properties of superconducting qubits, specifically Bell non-locality and quantum coherence. Our results demonstrate that increasing temperature induces a degradation of both of these essential properties for quantum computing. In contrast, Josephson energy is revealed to be an adjustable parameter allowing for the modulation of non-locality and coherence. However, we observe a trade-off in the simultaneous optimization of these two quantum resources via Josephson energy. This study underscores the crucial importance of thermal control and precise engineering of qubit parameters for the development of high-performance and robust superconducting quantum technologies.

DOI
10.1109/iccsc66714.2025.11135381

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This study investigates the progression of thermal entanglement and quantum coherence in a system composed of two superconducting charge qubits connected through a fixed capacitor. Superconducting materials play a central role in modern quantum technologies due to their ability to sustain coherent states over long timescales, making them an ideal platform for quantum information processing. We employ metrics such as logarithmic negativity and relative entropy of coherence to precisely evaluate these quantum resources. In particular, we analyze how thermal noise affects entanglement and quantum coherence in this capacitively coupled system. A central aspect of this work is the interaction between the reservoir's temperature at equilibrium and various intrinsic parameters of the system. The results show that increasing temperature leads to a gradual degradation of entanglement and coherence. However, these quantum resources are highly sensitive to system variables, and careful tuning of these variables can reduce the harmful impact of absolute temperature. These findings offer promising perspectives for optimizing two-qubit superconducting charge systems, with the aim of enhancing their robustness and fully exploiting the advantages offered by quantum technologies.
This study investigates the emergency effects of coupling two superconducting-charge-qubits on thermal equilibrium nonlocality behaviors, including Bell inequality violation (BIV) nonlocality and uncertainty-induced (UI) quantum nonlocality beyond logarithmic negativity entanglement (LN entanglement). Thermal entangled two superconducting-charge-qubits states can exhibit UI-quantum nonlocality without BIV nonlocality, highlighting the hierarchical relationship between these resources. Increasing Josephson-qubit energies enhances resistance to degradation at high temperatures. Large differences in Josephson-qubit energies amplify the degradation temperature for nonlocalities. Coupling of the two qubits improves robustness, preservation, and thermal interval of maximal and partial nonlocalities. The temperatures for sudden death of entanglement depend on Josephson qubit energies, their difference, and mutual coupling. Finally, we explore the symmetrical dependence of thermal two superconducting-qubit nonlocality on Josephson-qubit energies and mutual qubit coupling.
Abstract Superconducting charge qubits represent a cutting-edge technology in the field of quantum computing, offering a promising platform for quantum processing. This study delves into the behaviors of thermal coherence and quantum correlations within a two-superconducting charge qubit system coupled by a fixed capacitance. Specifically, we investigate the effects of thermal noise on entanglement (measured by concurrence), nonclassical correlations (quantified by local quantum uncertainty), and quantum coherence (measured by correlated coherence) within the two-superconducting charge qubit capacitively coupled. Our analysis takes into account the interplay between the equilibrium temperature of the reservoir and various system parameters. Our findings demonstrate that an increase in temperature leads to a decrease in coherence and quantum correlations within the considered system. However, the behavior of these quantum resources is heavily dependent on the system parameters, and a careful selection of these parameters can help mitigate the negative effects of absolute temperature. Additionally, we observe that local quantum uncertainty and correlated coherence are more resilient than thermal entanglement to rising temperatures. These results provide insight into how a two-superconducting charge qubit system can be optimized for achieving quantum advantages.
By considering the local quantum uncertainty (LQU) as a measure of quantum correlations, the thermal evolution of a two-qubit-superconducting system is investigated. We show that the thermal LQU can be increased by manipulating the Hamiltonian parameters such as the mutual coupling and Josephson energies, however, it undergoes sudden transitions at specific temperatures. Furthermore, a detailed analysis is presented regarding the impact of decohering channels on thermal LQU. This controllable LQU in engineering applications can disclose the advantage enabled in the superconducting charge qubits for designing quantum computers and quantum batteries.
We investigate thermal quantum correlations in a system of two coupled superconducting spin qubits described by an effective Andreev spin-qubit Hamiltonian in the presence of spin-orbit interaction. Using Local Quantum Fisher Information (LQFI) and Local Quantum Uncertainty (LQU) as quantum-correlation quantifiers, we analyze the effects of the superconducting phase difference, tunneling amplitude, spin-orbit coupling, and temperature on the nonclassical properties of the system. Analytical expressions for the thermal density matrix are obtained and employed to evaluate both quantities. Our results show that quantum correlations decrease monotonically with increasing temperature, while stronger tunneling and spin-orbit interaction significantly enhance their robustness. Moreover, the superconducting phase introduces a pronounced periodic behavior through the modulation of the effective exchange couplings, leading to constructive and destructive interference regimes that strongly influence the correlations. By analyzing the energy spectrum of the effective Hamiltonian, we demonstrate that the enhancement of quantum correlations is closely associated with an increased energy gap between the ground and first excited states, which suppresses thermal excitations and stabilizes the correlated ground state. Furthermore, LQFI is consistently larger than LQU throughout the investigated parameter space, reflecting its higher sensitivity to quantum fluctuations and local parameter estimation. These findings reveal the microscopic mechanism governing thermal quantum correlations in Andreev spin qubits and highlight the important roles of phase engineering, spin-orbit interaction, and tunneling in protecting quantum resources in hybrid superconducting quantum devices.