State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot

Abstract

Universal quantum computation requires high fidelity single qubit rotations and controlled two qubit gates. Along with high fidelity single qubit gates, strong efforts have been made in developing robust two qubit logic gates in electrically-gated quantum dot systems to realize a compact and nano-fabrication-compatible architecture. Here, we perform measurements of state-conditional coherent oscillations of a charge qubit. Using a quadruple quantum dot formed in a Si/SiGe heterostructure, we show the first demonstration of coherent two-axis control of a double quantum dot charge qubit in undoped Si/SiGe, performing Larmor and Ramsey oscillation measurements. We extract the strength of the capacitive coupling between double quantum dots by measuring the detuning energy shift ($\approx$ 75 $\mu$eV) of one double dot depending on the excess charge configuration of the other double dot. We further demonstrate that the strong capacitive coupling allows fast conditional Landau-Zener-Stuckelberg interferences with conditonal $\pi$ phase flip time about 80 ps, showing promising pathways toward multi-qubit entanglement control in semiconductor quantum dots.

9 pages, 8 figures including supplementary information

References in corpus (12)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Coherent spin manipulation in an exchange-only qubit
• A fault-tolerant addressable spin qubit in a natural silicon quantum dot
• Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Landau-Zener-Stuckelberg Interferometry of a Single Electron Charge Qubit
• Conditional operation of a spin qubit

Cited by in corpus (28)

• Scalable gate architecture for densely packed semiconductor spin qubits
• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Semiconductor Quantum Computation
• Three-electron spin qubits
• Microwave photon-mediated interactions between semiconductor qubits
• Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot
• Quantum supercapacitors
• Correlated spectrum of distant semiconductor qubits coupled by microwave photons
• Spin-Blockade Spectroscopy of Si/SiGe Quantum Dots
• Measurements of capacitive coupling within a quadruple quantum dot array
• Adiabatic two-qubit gates in capacitively coupled quantum dot hybrid qubits
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
• High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions
• Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits
• Ubiquitous non-local entanglement with Majorana bound states
• Coherent Charge Oscillations in a Bilayer Graphene Double Quantum Dot
• Generation of Schrödinger's cat states in a planar semiconductor heterostructure
• Suppression of leakage for a charge quadrupole qubit in triangular geometry
• Coupling two charge qubits via a superconducting resonator operating in the resonant and dispersive regimes
• Implementation of geometric quantum gates on microwave-driven semiconductor charge qubits
• Quantum Annealing Machine based on Floating Gate Array
• Tunable charge qubit based on barrier-controlled triple quantum dots
• Quantum Annealing Machines Based on Semiconductor Nanostructures
• Compressed Optimization of Device Architectures (CODA) for semiconductor quantum devices
• Effect of interactions on quantum-limited detectors
• Theory of interaction-dependent instability in quantum detection by means of Luttinger liquid tunnel junction: a rigorous theorem
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
• Photon-mediated entanglement between spin qubits beyond the dispersive regime