Read-out and Dynamics of the Qubit Built on Three Quantum Dots

Abstract

We present a model of a qubit built of a three coherently coupled quantum dots with three spins in a triangular geometry. The qubit states are encoded in the doublet subspace and they are controlled by a gate voltage, which breaks the triangular symmetry of the system. We show how to prepare the qubit and to perform one qubit operations. A new type of the current blockade effect will be discussed. The blockade is related with an asymmetry of transfer rates from the electrodes to different doublet states and is used to read-out of the dynamics of the qubit state. Our research also presents analysis of the Rabi oscillations, decoherence and leakage processes in the doublets subspace.

arXiv comment13 pages, 8 figures

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Cited by in corpus (8)

• Three-electron spin qubits
• Autonomous quantum Maxwell's demon based on two exchange-coupled quantum dots
• Dark states in spin-polarized transport through triple quantum dot molecules
• Magnetic Kondo regimes in a frustrated half-filled trimer
• Bias-induced chiral current and topological blockadein triple quantum dots
• Two-qubit logical operations in three quantum dots system
• Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots
• Landau-Zener Transitions in Spin Qubit Encoded in Three Quantum Dots