Spin Dynamics in Quantum Dot Arrays: Investigating Spin Interactions and Dynamics in Arrays of Quantum Dots for the Development of Spin-Based Quantum Computing Technologies

Registration ID: IJNRD_312908

Published ID: IJNRD2505580

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Dewashish Kumar

quantum dots, spin qubits, exchange interaction, coherence time, spin shuttling, quantum computing, semiconductor nanostructures, isotopic enrichment, g-tensor engineering

The coherent control and manipulation of electron spins in semiconductor quantum dot arrays represents a cornerstone approach for scalable spin-based quantum computing. This article presents a comprehensive investigation of spin dynamics in quantum dot arrays, focusing on the fundamental interactions that govern qubit coherence, entanglement, and operational fidelity. We examine the theoretical framework of exchange-coupled spins in lateral quantum dot systems, deriving the Heisenberg Hamiltonian formalism through both perturbative kinetic exchange theory and exact diagonalization approaches. Recent experimental advances in silicon, GaAs, and carbon nanotube-based quantum dot arrays are analyzed, with particular emphasis on coherence protection strategies, spin shuttling dynamics, and material engineering approaches. Data from state-of-the-art experiments demonstrate single-qubit gate fidelities reaching 99.97% in hopping-based control schemes and π/2 gate fidelity of 99.7% in GaAs triple quantum dots through optimized inter-dot orbital tuning. Coherent spin shuttling fidelities of 99.992% per hop have been achieved, with mobile qubit coherence times exceeding 30 μs through noise mitigation strategies. Theoretical analysis of spin shuttling with inhomogeneous g-tensors reveals that high-fidelity transfer requires tunnel couplings satisfying 2t_c≳60μeV for error rates below 〖10〗^(-3)over 10 μm distances. Material advances include isotopically enriched ²⁸Si with residual ²⁹Si concentration below 1 ppm—approximately 800-fold reduction in nuclear spin density—and GaAs-based devices demonstrating dynamical decoupling beyond 0.113 ms with optical π-pulse gates achieving 99.30% visibility. We conclude by evaluating the prospects for fault-tolerant quantum computation using quantum dot spin qubits and identify key directions for future research.

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Dewashish Kumar (May 2025). Spin Dynamics in Quantum Dot Arrays: Investigating Spin Interactions and Dynamics in Arrays of Quantum Dots for the Development of Spin-Based Quantum Computing Technologies. INTERNATIONAL JOURNAL OF NOVEL RESEARCH AND DEVELOPMENT, 10(5), f625-f633. https://ijnrd.org/papers/IJNRD2505580.pdf

Volume 10 Issue 5, May-2025

Pages : f625-f633

Paper Reg. ID: IJNRD_312908

Published Paper Id: IJNRD2505580

Research Area: Physics All

Author Type: Indian Author

Country: -, -, India

Published Paper PDF: https://ijnrd.org/papers/IJNRD2505580.pdf

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