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- W4385890359 abstract "Recently, gate-defined Josephson junctions based on magic-angle twisted bilayer graphene (MATBG) have been fabricated. In such a junction, local electrostatic gating can create two superconducting regions connected by an interaction-driven valley-polarized state as the weak link. Due to the spontaneous time-reversal and inversion symmetry breaking of the valley-polarized state, novel phenomena such as the Josephson diode effect have been observed without applying external fields. Importantly, when the so-called nonreciprocity efficiency (which measures the sign and strength of the Josephson effect) changes sign, the energy-phase relation of the junction is approximate $F(phi) approx cos(2phi)$ where $F$ is the free energy and $phi$ is the phase difference of the two superconductors. In this work, we show that such a MATBG-based Josephson junction, when shunted by a capacitor, can be used to realize the long-sought-after $0$-$pi$ qubits which are protected from local perturbation-induced decoherence. Interestingly, by changing the junction parameters, transmon-like qubits with large anharmonicity can also be realized. In short, by utilizing the novel interaction-driven valley-polarized state in MATBG, a single gate-defined Josephson junction can be used to replace complicated superconducting circuits for realizing qubits that are protected from local perturbations." @default.
- W4385890359 created "2023-08-17" @default.
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- W4385890359 date "2023-08-15" @default.
- W4385890359 modified "2023-09-27" @default.
- W4385890359 title "Valley-polarized Josephson Junctions as gate-tunable $0$-$pi$ qubit platforms" @default.
- W4385890359 doi "https://doi.org/10.48550/arxiv.2308.07888" @default.
- W4385890359 hasPublicationYear "2023" @default.
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