Full control of quadruple quantum dot circuit charge states in the single electron regime

Abstract

We report the realization of an array of four tunnel coupled quantum dots in the single electron regime, which is the first required step toward a scalable solid state spin qubit architecture. We achieve an efficient tunability of the system but also find out that the conditions to realize spin blockade readout are not as straightforwardly obtained as for double and triple quantum dot circuits. We use a simple capacitive model of the series quadruple quantum dots circuit to investigate its complex charge state diagrams and are able to find the most suitable configurations for future Pauli spin blockade measurements. We then experimentally realize the corresponding charge states with a good agreement to our model.

4 pages, 3 figures

References in corpus (5)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• A few-electron quadruple quantum dot in a closed loop

Cited by in corpus (8)

• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Electron Attraction Mediated by Coulomb Repulsion
• A triangular triple quantum dot with tunable tunnel couplings
• An automated approach for consecutive tuning of quantum dot arrays
• Highly tunable quadruple quantum dot in a narrow bandgap semiconductor InAs nanowire
• Co-tunneling spin blockade observed in a three-terminal triple quantum dot
• QArray: a GPU-accelerated constant capacitance model simulator for large quantum dot arrays
• Long-range spin transport in asymmetric quadruple quantum dots configurations