Wavelet correlation noise analysis for qubit operation variable time series

Abstract

In quantum computing, characterizing the full noise profile of qubits can aid in increasing coherence times and fidelities by developing error-mitigating techniques specific to the noise present. This characterization also supports efforts in advancing device fabrication to remove sources of noise. Qubit properties can be subject to non-trivial correlations in space and time, for example, spin qubits in MOS quantum dots are exposed to noise originating from the complex glassy behavior of two-level fluctuator ensembles. Engineering progress in spin qubit experiments generates large amounts of data, necessitating analysis techniques from fields experienced in managing large data sets. Fields such as astrophysics, finance, and climate science use wavelet-based methods to enhance their data analysis. Here, we propose and demonstrate wavelet-based analysis techniques to decompose signals into frequency and time components, enhancing our understanding of noise sources in qubit systems by identifying features at specific times. We apply the analysis to a state-of-the-art two-qubit experiment in a pair of SiMOS quantum dots with feedback applied to relevant operation variables. The observed correlations serve to identify common microscopic causes of noise, such as two-level fluctuators and hyperfine coupled nuclei, as well as to elucidate pathways for multi-qubit operation with more scalable feedback systems.

latest version

References in corpus (37)

• Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels
• NMR Techniques for Quantum Control and Computation
• A Two Qubit Logic Gate in Silicon
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• A programmable two-qubit quantum processor in silicon
• How to factor 2048 bit RSA integers in 8 hours using 20 million noisy qubits
• Storing quantum information for 30 seconds in a nanoelectronic device
• Computing with spin qubits at the surface code error threshold
• Entanglement Distillation between Solid-State Quantum Network Nodes
• Silicon quantum processor unit cell operation above one Kelvin
• Two-qubit silicon quantum processor with operation fidelity exceeding 99%
• Long-distance entanglement purification for quantum communication
• Spectroscopy of Surface-Induced Noise Using Shallow Spins in Diamond
• Precision tomography of a three-qubit donor quantum processor in silicon
• Fault-tolerant operation of a logical qubit in a diamond quantum processor
• Silicon qubit fidelities approaching incoherent noise limits via pulse engineering
• Experimental noise filtering by quantum control
• Assessment of a silicon quantum dot spin qubit environment via noise spectroscopy
• Efficient C-Phase gate for single-spin qubits in quantum dots
• Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
• A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
• Two-qubit spectroscopy of spatiotemporally correlated quantum noise in superconducting qubits
• A silicon quantum-dot-coupled nuclear spin qubit
• Non-Markovian qubit dynamics in the presence of 1/f noise
• Noise-correlation spectrum for a pair of spin qubits in silicon
• Spectroscopy of cross-correlations of environmental noises with two qubits
• Assessment of error variation in high-fidelity two-qubit gates in silicon
• Low charge noise quantum dots with industrial CMOS manufacturing
• Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
• Bell-state tomography in a silicon many-electron artificial molecule
• Suppressing Correlated Noise in Quantum Computers via Context-Aware Compiling
• Identifying single electron charge sensor events using wavelet edge detection
• Real-time feedback protocols for optimizing fault-tolerant two-qubit gate fidelities in a silicon spin system
• Optimal dynamical decoupling in the presence of colored control noise
• Wavelet-resolved coherence beats in the Overhauser field of a thermal nuclear spin ensemble
• Wavelet-based Ramsey magnetometry enhancement of a single NV center in diamond