Six-electron semiconductor double quantum dot qubits

Abstract

We consider a double-quantum-dot (DQD) qubit which contains six electrons instead of the usual one or two. In this spin qubit, quantum information is encoded in a low-lying singlet-triplet space much as in the case of a two-electron DQD qubit. We find that initialization, manipulation, and read- out can be performed similarly to the two-electron case, and that energy gaps remain large enough that these operations can be performed robustly. We consider DQD potentials with parameters chosen to be representative of current experimental capabilities. Results are obtained using two complementary full configuration interaction methods.

14 pages, 23 figures

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Cited by in corpus (21)

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• Coherent spin-valley oscillations in silicon
• The Role of Multilevel Landau-Zener Interference in Extreme Harmonic Generation
• Transporting a single-spin qubit through a double quantum dot
• Ferromagnetism in Quantum Dot Plaquettes
• A Spin Quintet in a Silicon Double Quantum Dot: Spin Blockade and Relaxation
• Fast pulse sequences for dynamically corrected gates in single-triplet qubits
• Negative exchange interactions in coupled few-electron quantum dots
• Validity of the single-particle description and charge noise resilience for multielectron quantum dots
• Suppression of charge noise using barrier control of a singlet-triplet qubit
• Interplay of exchange and superexchange in triple quantum dots
• Noise-Protected Gate for Six-Electron Double-Dot Qubits
• Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
• Theory of charge stability diagrams in coupled quantum dot qubits
• Non-stationary spin-filtering effects in correlated quantum dot
• Preparation and Readout of Multielectron High-Spin States in a Gate-Defined GaAs/AlGaAs Quantum Dot
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient
• Dressed basis sets for the modeling of exchange interactions in double quantum dots