Single to quadruple quantum dots with tunable tunnel couplings

Abstract

We prepare a gate-defined quadruple quantum dot to study the gate-tunability of single to quadruple quantum dots with finite inter-dot tunnel couplings. The measured charging energies of various double dots suggest that the dot size is governed by gate geometry. For the triple and quadruple dots we study gate-tunable inter-dot tunnel couplings. Particularly for the triple dot we find that the effective tunnel coupling between side dots significantly depends on the alignment of the center dot potential. These results imply that the present quadruple dot device has gate performance relevant for implementing spin-based four-qubit systems with controllable exchange couplings.

6 pages, 4 figures

References in corpus (13)

• Quantum Computation with Quantum Dots
• Electron transport through double quantum dots
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Two-qubit Gate of Combined Single Spin Rotation and Inter-dot Spin Exchange in a Double Quantum Dot
• An electrostatically defined serial triple quantum dot charged with few electrons
• Long-range coherent coupling in a quantum dot array
• Bipolar spin blockade and coherent state superpositions in a triple quantum dot
• Conditional operation of a spin qubit
• Coherence and Screening in Multi-Electron Spin Qubits
• Coherent Manipulation of Individual Electron Spin in a Double Quantum Dot Integrated with a Micro-Magnet

Cited by in corpus (42)

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• Tuning methods for semiconductor spin--qubits
• Full control of quadruple quantum dot circuit charge states in the single electron regime
• Coherent electron-spin-resonance manipulation of three individual spins in a triple quantum dot
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• Photon assisted long-range tunneling
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• Fast Long-Distance Control of Spin Qubits by Photon Assisted Cotunneling
• Transporting a single-spin qubit through a double quantum dot
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• Sub Decoherence Time Generation and Detection of Orbital Entanglement
• Extracting inter-dot tunnel couplings between few donor quantum dots in silicon
• Control of dephasing in spin qubits during coherent transport in silicon
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• Floquet Majorana Fermions in superconducting quantum dots
• A realistic non-local heat engine based on Coulomb coupled systems
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• Tunable tunnel coupling in a double quantum antidot with cotunneling via localized state
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• 4$\pi$ and 8$\pi$ dual Josephson effects induced by symmetry defects
• Fingerprints of Majorana bound states in quantum-rings
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• Hitting time for quantum walks of identical particles
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• Microwave dependent quantum transport characteristics in GaN/AlGaN FETs
• Synchronized coherent charge oscillations in coupled double quantum dots