Effects of low-frequency noise cross-correlations in coupled superconducting qubits

Abstract

We study the effects of correlated low frequency noise sources acting on a two qubit gate in a fixed coupling scheme. A phenomenological model for the spatial and cross-talk correlations is introduced. The decoherence inside the SWAP subspace is analysed by combining analytic results based on the adiabatic approximation and numerical simulations. Results critically depend on amplitude of the low frequency noise with respect to the qubits coupling strength. Correlations between noise sources induce qualitative different behaviors depending on the values of the above parameters. The possibility to reduce dephasing due to correlated low frequency noise by a recalibration protocol is discussed.

18 pages, 7 figures

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• Giant Kerr nonlinearities in Circuit-QED
• Two-qubit spectroscopy of spatiotemporally correlated quantum noise in superconducting qubits
• Spectroscopy of cross-correlations of environmental noises with two qubits
• Entanglement degradation in the solid state: interplay of adiabatic and quantum noise
• Optimal tuning of solid-state quantum gates: A universal two-qubit gate
• Correlated flux noise and decoherence in two inductively coupled flux qubits
• Decoherence times of universal two-qubit gates in the presence of broad-band noise
• The dynamics of two entangled qubits exposed to classical noise: role of spatial and temporal noise correlations
• Correlated vs. uncorrelated noise acting on a quantum refrigerator
• Dissipation and decoherence induced by collective dephasing in coupled-qubit system with a common bath
• Broadband noise decoherence in solid-state complex architectures
• Noise Classification in Three-Level Quantum Networks by Machine Learning
• Low-frequency critical current noise in graphene Josephson junctions in the open-circuit gate voltage limit
• Open-loop quantum control of small-size networks for high-order cumulants and cross-correlations sensing
• Entanglement dynamics and performance of two-qubit gates for superconducting qubits under non-Markovian effects