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Flux-bias-free flux qubit driven by low-power single-flux-quantum driver on monolithically integrated circuit
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DOI：10.1140/epjqt/s40507-026-00538-3.png)
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Abstract
En 中文
Single-flux-quantum (SFQ) cryogenic control circuits are a promising approach for realizing scalable superconducting quantum processors. However, previous studies have primarily relied on conventional SFQ technologies with Josephson junction critical current densities ($J_{\mathrm{C}}$) of about 1 kA/cm2 and critical currents ($I_{\mathrm{C}}$) of several hundred microamperes. Such large critical currents can increase power dissipation and induce nonequilibrium quasiparticles that degrade qubit performance. In this study, we demonstrate coherent control of a flux-bias-free (FBF) flux qubit using a low-power SFQ driver monolithically integrated on the same chip. The SFQ driver was fabricated using epitaxial NbN/AlN/NbN Josephson junctions with critical currents of only a few microamperes, approximately two orders of magnitude smaller than those used in conventional SFQ circuits. Using this low-$I_{\mathrm{C}}$ SFQ driver, we found that the energy relaxation time, $T_{1}$, of the FBF qubit remains comparable to that obtained under conventional microwave control, indicating that the low-$I_{\mathrm{C}}$ SFQ driver does not introduce a measurable degradation of qubit performance in the present device.
Keywords:
Superconducting qubits
Single-flux-quantum (SFQ) circuits
Monolithic integration
Cryogenic control of qubits
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