Single-electron Spin Resonance in a Quadruple Quantum Dot

Abstract

Electron spins in semiconductor quantum dots are good candidates of quantum bits for quantum information processing. Basic operations of the qubit have been realized in recent years: initialization, manipulation of single spins, two qubit entanglement operations, and readout. Now it becomes crucial to demonstrate scalability of this architecture by conducting spin operations on a scaled up system. Here, we demonstrate single-electron spin resonance in a quadruple quantum dot. A few-electron quadruple quantum dot is formed within a magnetic field gradient created by a micro-magnet. We oscillate the wave functions of the electrons in the quantum dots by applying microwave voltages and this induces electron spin resonance. The resonance energies of the four quantum dots are slightly different because of the stray field created by the micro-magnet and therefore frequency-resolved addressable control of the electron spin resonance is possible.

11 pages, 3 figures

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• Randomized benchmarking of barrier versus tilt control of a singlet-triplet qubit
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• Fast pulse sequences for dynamically corrected gates in single-triplet qubits
• Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot
• Highly tunable quadruple quantum dot in a narrow bandgap semiconductor InAs nanowire
• Radio-frequency reflectometry in bilayer graphene devices utilizing micro graphite back-gates
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• Flying Spin Qubits in Quantum Dot Arrays Driven by Spin-Orbit Interaction
• Co-tunneling spin blockade observed in a three-terminal triple quantum dot
• Visual explanations of machine learning model estimating charge states in quantum dots
• Simulation of Coupling Strength of Capacitively Coupled Singlet-Triplet Qubits
• Dynamics of quantum cellular automata electron transition in triple quantum dots
• Difference in charge and spin dynamics in a quantum dot-lead coupled system
• Formation of multiple quantum dots in ZnO heterostructures
• Automatic detection of single-electron regime of quantum dots and definition of virtual gates using U-Net and clustering
• Room-Temperature Pauli Spin Blockade and Current Rectification in 15-13-15 Armchair Graphene Nanoribbon Heterostructures
• Exact diagonalization study of double quantum dots in parallel geometry in zero-bandwidth limit
• Simulating decoherence of two coupled spins using the generalized cluster correlation expansion