Non-Gaussian signatures and collective effects in charge noise affecting a dynamically-decoupled qubit

Abstract

The effects of a collection of classical two-level charge fluctuators on the coherence of a dynamically-decoupled qubit are studied. Distinct dynamics are found at different qubit working positions. Exact analytical formulae are derived at pure dephasing and approximate solutions are found at the general working position, for weakly- and strongly-coupled fluctuators. Analysis of these solutions, combined with numerical simulations of the multiple random telegraph processes, reveal the scaling of the noise with the number of fluctuators and the number of control pulses, as well as dependence on other parameters of the qubit-fluctuators system. These results can be used to determine potential microscopic models for the charge environment by performing noise spectroscopy.

18 pages, 9 figures

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Cited by in corpus (18)

• Environmental noise spectroscopy with qubits subjected to dynamical decoupling
• Three-electron spin qubits
• Spectroscopy of cross-correlations of environmental noises with two qubits
• Non-Markovian dynamics of single- and two-qubit systems interacting with Gaussian and non-Gaussian fluctuating transverse environments
• Decoherence of two entangled spin qubits coupled to an interacting sparse nuclear spin bath: application to nitrogen vacancy centers
• Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
• The dynamical-decoupling-based spatiotemporal noise spectroscopy
• Trispectrum reconstruction of non-Gaussian noise
• Influence of nuclear spin polarization on spin echo signal of NV center qubit
• Learning Noise via Dynamical Decoupling of Entangled Qubits
• Characterizing low-frequency qubit noise
• Indications of a soft cutoff frequency in the charge noise of a Si/SiGe quantum dot spin qubit
• Decoherence induced by a sparse bath of two-level fluctuators: peculiar features of $1/f$ noise in high-quality qubits
• Nonergodic measurements of qubit frequency noise
• Wavelet-resolved coherence beats in the Overhauser field of a thermal nuclear spin ensemble
• Decoherence-assisted detection of entanglement of two qubit states
• Decoherence and fidelity enhancement during shuttling of entangled spin qubits
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots