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 SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.
Experimental demonstration of a WSi weak link in a 3D RF-SQUID showing non-sinusoidal current-phase relation with measured relaxation times of trapped persistent-current states.
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.
citing papers explorer
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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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High-gain and large-bandwidth Josephson parametric amplifier influenced by Fabry-P\'erot interference
A SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.
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WSi weak link element with a non-sinusoidal current-phase relation
Experimental demonstration of a WSi weak link in a 3D RF-SQUID showing non-sinusoidal current-phase relation with measured relaxation times of trapped persistent-current states.
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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.