RFSoC-based radio-frequency reflectometry in gate-defined bilayer graphene quantum devices

Abstract

Quantum computers require both scalability and high performance for practical applications. While semiconductor quantum dots are promising candidates for quantum bits, the complexity of measurement setups poses an important challenge for scaling up these devices. Here, radio-frequency system-on-chip (RFSoC) technology is exepcted for a promising approach that combines scalability with flexibility. In this paper, we demonstrate RF reflectometry in gate-defined bilayer graphene quantum devices using RFSoC-based measurement architecture. By controlling the confinement strength through gate voltages, we achieve both Fabry-Pérot interferometer and quantum dot operations in a single device. Although impedance matching conditions currently limit the measurement sensitivity, we identify pathways for optimization through tunnel barrier engineering and resonator design. These results represent a step toward integrating high-bandwidth measurements with scalable quantum devices.

6 pages, 4 figures

References in corpus (34)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Quantum interference and Klein tunneling in graphene heterojunctions
• An addressable quantum dot qubit with fault-tolerant control fidelity
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• The hot pick-up technique for batch assembly of van der Waals heterostructures
• Storing quantum information for 30 seconds in a nanoelectronic device
• Excitation Spectra of Circular Few-Electron Quantum Dots
• Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Scaling silicon-based quantum computing using CMOS technology: State-of-the-art, Challenges and Perspectives
• The QICK (Quantum Instrumentation Control Kit): Readout and control for qubits and detectors
• Spin and Valley States in Gate-defined Bilayer Graphene Quantum Dots
• Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins
• Coupled quantum dots in bilayer graphene
• Gate-defined electron-hole double dots in bilayer graphene
• Long-lived valley states in bilayer graphene quantum dots
• Sensitive radio-frequency measurements of a quantum dot by tuning to perfect impedance matching
• Spin relaxation in a single-electron graphene quantum dot
• A CMOS dynamic random access architecture for radio-frequency readout of quantum devices
• Low charge noise quantum dots with industrial CMOS manufacturing
• Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices
• How to wire a 1000-qubit trapped ion quantum computer
• Real-Time Feedback Control of Charge Sensing for Quantum Dot Qubits
• ICARUS-Q: Integrated Control and Readout Unit for Scalable Quantum Processors
• Experimental advances with the QICK (Quantum Instrumentation Control Kit) for superconducting quantum hardware
• On-chip Integration of Si/SiGe-based Quantum Dots and Switched-capacitor Circuits
• Dispersive sensing of charge states in a bilayer graphene quantum dot
• Fabry-Pérot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts
• Kondo effect in electrostatically defined ZnO quantum dots
• Cryogenic hyperabrupt strontium titanate varactors for sensitive reflectometry of quantum dots
• Radio-frequency reflectometry in bilayer graphene devices utilizing micro graphite back-gates
• Pauli blockade catalogue and three- and four-particle Kondo effect in bilayer graphene quantum dots
• Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator
• Wide dynamic range charge sensor operation by high-speed feedback control of radio-frequency reflectometry