Passive and active suppression of transduced noise in silicon spin qubits

Abstract

Addressing and mitigating decoherence sources plays an essential role in the development of a scalable quantum computing system, which requires low gate errors to be consistently maintained throughout the circuit execution. While nuclear spin-free materials, such as isotopically purified silicon, exhibit intrinsically promising coherence properties for electron spin qubits, the omnipresent charge noise, when converted to magnetic noise under a strong magnetic field gradient, often hinders stable qubit operation within a time frame comparable to the data acquisition time. Here, we demonstrate both open- and closed-loop suppression techniques for the transduced noise in silicon spin qubits, resulting in a more than two-fold (ten-fold) improvement of the inhomogeneous coherence time (Rabi oscillation quality) that leads to a single-qubit gate fidelity of over 99.6% even in the presence of a strong decoherence field gradient. Utilizing gate set tomography, we show that adaptive qubit control also reduces the non-Markovian noise in the system, which validates the stability of the gate fidelity. The technique can be used to learn multiple Hamiltonian parameters and is useful for the intermittent calibration of the circuit parameters with affordable experimental overhead, providing a useful subroutine during the repeated execution of general quantum circuits.

References in corpus (48)

• Single-shot read-out of an individual electron spin in a quantum dot
• Silicon Quantum Electronics
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Semiconductor Spin Qubits
• Decoherence in a superconducting quantum bit circuit
• Electrically driven single electron spin resonance in a slanting Zeeman field
• How to Enhance Dephasing Time in Superconducting Qubits
• Computing with spin qubits at the surface code error threshold
• Fast universal quantum control above the fault-tolerance threshold in silicon
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Universal control of a six-qubit quantum processor in silicon
• Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography
• A four-qubit germanium quantum processor
• Semiconductor Qubits In Practice
• Scalable gate architecture for densely packed semiconductor spin qubits
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Quantum back-action of variable-strength measurement
• Precision tomography of a three-qubit donor quantum processor in silicon
• Silicon qubit fidelities approaching incoherent noise limits via pulse engineering
• Gate Set Tomography
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Quantum error correction with silicon spin qubits
• Low-frequency charge noise in Si/SiGe quantum dots
• Dynamic stabilization of the optical resonances of single nitrogen-vacancy centers in diamond
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Quantum tomography of an entangled three-spin state in silicon
• Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
• One-by-one trap activation in silicon nanowire transistors
• Robust micro-magnet design for fast electrical manipulations of single spins in quantum dots
• Reducing charge noise in quantum dots by using thin silicon quantum wells
• Characterization of a qubit Hamiltonian using adaptive measurements in a fixed basis
• Active Stabilization of Ion Trap Radiofrequency Potentials
• Noise-correlation spectrum for a pair of spin qubits in silicon
• Quantum dephasing in a gated GaAs triple quantum dot due to nonergodic noise
• Improving qubit coherence using closed-loop feedback
• Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
• Tunable coupling and isolation of single electrons in silicon metal-oxide-semiconductor quantum dots
• Adaptive tracking of a time-varying field with a quantum sensor
• Fabrication process and failure analysis for robust quantum dots in silicon
• Wafer-scale low-disorder 2DEG in ${}^{28}$Si/SiGe without an epitaxial Si cap
• Real-time two-axis control of a spin qubit
• Real-time feedback protocols for optimizing fault-tolerant two-qubit gate fidelities in a silicon spin system
• Qubit quantum-dot sensors: noise cancellation by coherent backaction, initial slips, and elliptical precession
• Coherent Backaction of Quantum Dot Detectors: Qubit Isospin Precession
• Approaching ideal visibility in singlet-triplet qubit operations using energy-selective tunneling-based Hamiltonian estimation
• Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations
• Efficient adaptive Bayesian estimation of a slowly fluctuating Overhauser field gradient
• Optimal frequency estimation and its application to quantum dots

Cited by in corpus (4)

• Real-time adaptive tracking of fluctuating relaxation rates in superconducting qubits
• Stabilizing an individual charge fluctuator in a Si/SiGe quantum dot
• Efficient Qubit Calibration by Binary-Search Hamiltonian Tracking
• Rapid Autotuning of a SiGe Quantum Dot into the Single-Electron Regime with Machine Learning and RF-Reflectometry FPGA-Based Measurements