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Applied Physics B

Quantum dense coding and teleportation based on two coupled quantum dot molecules influenced by intrinsic decoherence, tunneling rates, and Coulomb coupling interaction

Seyed Mohammad Hosseiny

Published Dec 8, 2023• 17 citations
Publisher
DOI
10.1007/s00340-023-08130-8

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The influences of intrinsic decoherence, tunnelling rates, and Coulomb coupling interaction on the behaviour of negativity, quantum coherence and the measurement-induced disturbance of two coupled quantum dot molecules are discussed. The aforementioned is implemented by obtaining the exact solution of the Milburn equation, where the initial setting state is prepared in an entangled Werner state. Various phenomena are illustrated for three physical measures, namely entanglement, coherence, and quantum correlations. It showed that the intrinsic decoherence strength plays a destructive role for the maximum bounds of all these physical quantities, in which they are decayed to a non-zero fixed point. Altering the tunnelling rates strength increases/ decreases the maximum and minimum bounds of the three physical measurements, whereby increasing the tunnelling rate lessens the entanglement and denigrates the maximum and minimum values of coherence and quantumness. Otherwise, the Coulomb coupling enhances the stability of all physical quantities.
This work explores the generation and robustness dynamics of coupled double quantum dots using uncertainty-induced (UI) nonlocality, maximum Bell-CHSH inequality, and log-negativity with intrinsic-decoherence. This study examines the generation of Bell-CHSH nonlocality, UI-nonlocality, and log-negativity entanglement using a separable two-double-quantum-dots state. Enhancing these features is achieved by tuning intrinsic decoherence and dot interaction strengths, highlighting their potential for creating robust quantum correlations. The two-double-quantum-dots correlated states can be produced and enhanced by increasing the pair-dots tunneling couplings and Coulomb-two-electrons interactions. The decoherence effect acceleration depends on Coulomb-two-electrons interactions and the pair-dots tunneling coupling. For a maximally entangled state, the robustness dynamics of the initial maximal Bell-CHSH-nonlocality, UI-nonlocality, and log-negativity’s entanglement, is explored against the two-double-quantum-dots interactions and the decoherence effects.
The influence of intrinsic decoherence on various correlations and dense coding in a model which consists of two identical superconducting charge qubits coupled by a fixed capacitor is investigated. The results show that, despite the intrinsic decoherence, the correlations as well as the dense coding channel capacity can be effectively increased via the combination of system parameters, i.e., the mutual coupling energy between the two charge qubits is larger than the Josephson energy of the qubit. The bigger the difference between them is, the better the effect is.