A two-dimensional array of single-hole quantum dots

Abstract

Quantum dots fabricated using techniques and materials that are compatible with semiconductor manufacturing are promising for quantum information processing. While great progress has been made toward high-fidelity control of quantum dots positioned in a linear arrangement, scalability along two dimensions is a key step toward practical quantum information processing. Here we demonstrate a two-dimensional quantum dot array where each quantum dot is tuned to single-charge occupancy, verified by simultaneous measuring with two integrated radio frequency charge sensors. We achieve this by using planar germanium quantum dots with low disorder and small effective mass, allowing the incorporation of dedicated barrier gates to control the coupling of the quantum dots. We demonstrate hole charge filling consistent with a Fock-Darwin spectrum and show that we can tune single-hole quantum dots from isolated quantum dots to strongly exchange coupled quantum dots. These results motivate the use of planar germanium quantum dots as building blocks for quantum simulation and computation.

7 pages, 4 figures

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• Probing resonating valence bonds on a programmable germanium quantum simulator
• Quantum control of hole spin qubits in double quantum dots
• All-electrical control of hole singlet-triplet spin qubits at low leakage points
• Charge-noise induced dephasing in silicon hole-spin qubits
• CMOS Quantum Computing: Toward A Quantum Computer System-on-Chip
• Emergence and Dynamical Stability of Charge Time-Crystal in a Current-Carrying Quantum Dot Simulator
• Majorana zero modes in gate-defined germanium hole nanowires
• Autonomous estimation of high-dimensional Coulomb diamonds from sparse measurements
• A quantum dot in germanium proximitized by a superconductor
• Coupled vertical double quantum dots at single-hole occupancy
• Modular Autonomous Virtualization System for Two-Dimensional Semiconductor Quantum Dot Arrays
• Gate reflectometry in dense quantum dot arrays
• Exact analytical treatment of multiqubit noisy dynamics in exchange-coupled semiconductor spin qubits
• Braiding Majoranas in a linear quantum dot-superconductor array: Mitigating the errors from Coulomb repulsion and residual tunneling
• Conductance of a Dissipative Quantum Dot: Nonequilibrium Crossover Near a Non-Fermi-Liquid Quantum Critical Point
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Giant Rabi frequencies between qubit and excited hole states in silicon quantum dots