Fast charge sensing of Si/SiGe quantum dots via a high-frequency accumulation gate

Abstract

Quantum dot arrays are a versatile platform for the implementation of spin qubits, as high-bandwidth sensor dots can be integrated with single-, double- and triple-dot qubits yielding fast and high-fidelity qubit readout. However, for undoped silicon devices, reflectometry off sensor ohmics suffers from the finite resistivity of the two-dimensional electron gas (2DEG), and alternative readout methods are limited to measuring qubit capacitance, rather than qubit charge. By coupling a surface-mount resonant circuit to the plunger gate of a high-impedance sensor, we realized a fast charge sensing technique that is compatible with resistive 2DEGs. We demonstrate this by acquiring at high speed charge stability diagrams of double- and triple-dot arrays in Si/SiGe heterostructures as well as pulsed-gate single-shot charge and spin readout with integration times as low as 2.4 $\mu$s.

arXiv comment10 pages, 5 figures, plus supplementary information with 9 pages and 6 figures

References in corpus (29)

• Quantum Computation with Quantum Dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Silicon Quantum Electronics
• A Two Qubit Logic Gate in Silicon
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• A programmable two-qubit quantum processor in silicon
• Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
• Quantum CNOT Gate for Spins in Silicon
• Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot
• Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot
• A fault-tolerant addressable spin qubit in a natural silicon quantum dot
• Fast sensing of double-dot charge arrangement and spin state with an rf sensor quantum dot
• Rapid high-fidelity gate-based spin read-out in silicon
• Gate-based single-shot readout of spins in silicon
• Charge and spin state readout of a double quantum dot coupled to a resonator
• Gate-reflectometry dispersive readout and coherent control of a spin qubit in silicon
• Single-shot measurement of triplet-singlet relaxation in a Si/SiGe double quantum dot
• Pauli spin blockade in undoped Si/SiGe two-electron double quantum dots
• Dispersively detected Pauli Spin-Blockade in a Silicon Nanowire Field-Effect Transistor
• Single-shot single-gate RF spin readout in silicon
• Coherence and Screening in Multi-Electron Spin Qubits
• Charge dynamics and spin blockade in a hybrid double quantum dot in silicon
• Dispersive readout of a silicon quantum dot with an accumulation-mode gate sensor
• High-fidelity and robust two-qubit gates for quantum-dot spin qubits in silicon
• Lifetime measurements (T1) of electron spins in Si/SiGe quantum dots
• Identifying single electron charge sensor events using wavelet edge detection
• Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot

Cited by in corpus (21)

• Semiconductor Qubits In Practice
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Probing quantum devices with radio-frequency reflectometry
• Radio-frequency detected fast charge sensing in undoped silicon quantum dots
• Single-electron control in a foundry-fabricated two-dimensional qubit array
• Roadmap towards Majorana qubits and nonabelian physics in quantum dot-based minimal Kitaev chains
• Rapid high-fidelity spin state readout in Si/SiGe quantum dots via radio-frequency reflectometry
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
• Autonomous tuning and charge state detection of gate defined quantum dots
• Large dispersive interaction between a CMOS double quantum dot and microwave photons
• Radio frequency reflectometry in silicon-based quantum dots
• Radio-frequency reflectometry of a quantum dot using an ultra-low-noise SQUID amplifier
• Autonomous estimation of high-dimensional Coulomb diamonds from sparse measurements
• Dispersive sensing of charge states in a bilayer graphene quantum dot
• Gate reflectometry in dense quantum dot arrays
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• The role of antisymmetric orbitals and electron-electron interactions on the two-particle spin and valley blockade in graphene double quantum dots
• Spin-qubit readout analysis based on a hidden Markov model
• Designs for a two-dimensional Si quantum dot array with spin qubit addressability
• Comparison of spin-qubit architectures for quantum error-correcting codes
• Radio-frequency charge detection on graphene electron-hole double quantum dots