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Spin-orbit signatures in the dynamics of singlet-triplet qubits in double quantum dots

E. Cota, Sergio E. Ulloa, Juan E. Rolon

Apr 21, 20200 citations

Decoherence of Generated Two-Qubit Nonlocalities in a Single Electron Double Quantum Dot with Various Spin-Orbit Interactions

Abdel‐Baset A. Mohamed, Heba Allhibi, Fahad Aljuaydi

International Journal of Theoretical PhysicsOct 18, 20251 citation

Dynamics of quantum resources in double quantum dot system under Rashba spin–orbit interaction

Aicha Chouiba, Samira Elghaayda, Mostafa Mansour

Abstract In this paper, we investigate the dynamics of quantum resources (QRs) in a double quantum dot (DQD) system subject to thermal fluctuations. We explore the effects of temperature, Rashba spin–orbit interaction (RSOI), and other system parameters on QR in this system. We use three quantum measures in this context: linear entropy, first-order coherence, and entanglement quantified by concurrence. The results demonstrate the detrimental effects of thermal noise and that an increase in the Zeeman splitting exacerbates this degradation of QR. The findings further reveal that careful tuning of the RSOI can enhance and preserve thermal quantum correlations. Interestingly, first-order coherence persists at higher temperatures than entanglement, indicating that coherence-based tasks and protocols could be more resilient in spin-qubit arrays. Unlike entanglement and coherence, linear entropy increases with temperature and Rashba coupling, suggesting that the RSOI increases the mixedness of the thermal state in the DQD system.Abstract In this paper, we investigate the dynamics of quantum resources (QRs) in a double quantum dot (DQD) system subject to thermal fluctuations. We explore the effects of temperature, Rashba spin–orbit interaction (RSOI), and other system parameters on QR in this system. We use three quantum measures in this context: linear entropy, first-order coherence, and entanglement quantified by concurrence. The results demonstrate the detrimental effects of thermal noise and that an increase in the Zeeman splitting exacerbates this degradation of QR. The findings further reveal that careful tuning of the RSOI can enhance and preserve thermal quantum correlations. Interestingly, first-order coherence persists at higher temperatures than entanglement, indicating that coherence-based tasks and protocols could be more resilient in spin-qubit arrays. Unlike entanglement and coherence, linear entropy increases with temperature and Rashba coupling, suggesting that the RSOI increases the mixedness of the thermal state in the DQD system.

Laser PhysicsMay 22, 20260 citations

Dynamics and Decoherence in Quantum - Dot Spin Qubits

Mahn‐Soo Choi

한국자기학회 학술연구발표회 논문개요집Dec 1, 20040 citations

Spin-orbit qubit using quantum dots

Ryan Jock

Methods and apparatus of quantum information processing using quantum dots are provided. Electrons from a 2DEG are confined to the quantum dots and subjected to a magnetic field having a component directed parallel to the interface. Due to interfacial asymmetries, there is created an effective magnetic field that perturbs the energies of the spin states via an interfacial spin-orbit (SO) interaction. This SO interaction is utilized to controllably produce rotations of the electronic spin state, such as X-rotations of the electronic spin state in a double quantum dot (DQD) singlet-triplet (ST) qubit. The desired state rotations are controlled solely by the use of electrical pulses.Methods and apparatus of quantum information processing using quantum dots are provided. Electrons from a 2DEG are confined to the quantum dots and subjected to a magnetic field having a component directed parallel to the interface. Due to interfacial asymmetries, there is created an effective magnetic field that perturbs the energies of the spin states via an interfacial spin-orbit (SO) interaction. This SO interaction is utilized to controllably produce rotations of the electronic spin state, such as X-rotations of the electronic spin state in a double quantum dot (DQD) singlet-triplet (ST) qubit. The desired state rotations are controlled solely by the use of electrical pulses.

Nov 22, 20230 citations

Time-dependent single-electron transport through quantum dots

T. Fujisawa, T. Hayashi, Satoshi Sasaki

We describe time-dependent single-electron transport through quantum dots in the Coulomb blockade regime. Coherent dynamics of a single charge qubit in a double quantum dot is discussed with full one-qubit manipulation. Strength of decoherence is controlled with the applied voltage, but uncontrolled decoherence arises from electron–phonon coupling and background fluctuations. Then energy-relaxation dynamics is discussed for orbital and spin degree of freedom in a quantum dot. The electron–phonon interaction and spin–orbit coupling can be investigated as the dissipation problem. Finally, charge detection measurement is presented for statistical analysis of single-electron tunnelling transitions and for a sensitive qubit read-out device.We describe time-dependent single-electron transport through quantum dots in the Coulomb blockade regime. Coherent dynamics of a single charge qubit in a double quantum dot is discussed with full one-qubit manipulation. Strength of decoherence is controlled with the applied voltage, but uncontrolled decoherence arises from electron–phonon coupling and background fluctuations. Then energy-relaxation dynamics is discussed for orbital and spin degree of freedom in a quantum dot. The electron–phonon interaction and spin–orbit coupling can be investigated as the dissipation problem. Finally, charge detection measurement is presented for statistical analysis of single-electron tunnelling transitions and for a sensitive qubit read-out device.

Reports on Progress in PhysicsFeb 20, 2006111 citations

Spin-orbit effects on the full dynamics of double quantum dot qubit states

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