A Fourier-engineered cos(2φ) qubit achieves spectral agreement with theory but its energy relaxation is limited by 1/f flux noise from residual first-harmonic fluctuations, unlike similar fluxonium qubits.
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A modified multi-mode rhombus circuit realizes a biased-noise superconducting qubit with measured average relaxation time of 500 microseconds in the biased regime versus 27 microseconds at frustration.
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Coherence limitations of a Fourier-engineered $\cos(2\varphi)$ transmon qubit
A Fourier-engineered cos(2φ) qubit achieves spectral agreement with theory but its energy relaxation is limited by 1/f flux noise from residual first-harmonic fluctuations, unlike similar fluxonium qubits.
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Revisiting the multi-mode rhombus circuit as a biased-noise qubit
A modified multi-mode rhombus circuit realizes a biased-noise superconducting qubit with measured average relaxation time of 500 microseconds in the biased regime versus 27 microseconds at frustration.