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 millikelvin superconducting DAC integrated with fluxonium qubits generates persistent flux tuning signals via SFQ pulses without measurable coherence degradation.
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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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Millikelvin digital-to-analog converter for superconducting quantum processors
A millikelvin superconducting DAC integrated with fluxonium qubits generates persistent flux tuning signals via SFQ pulses without measurable coherence degradation.