Coherent manipulation of an Andreev spin qubit

DOI10.1126/SCIENCE.ABF0345zbMATH Open1491.81008arXiv2101.06701OpenAlexW3184940100MaRDI QIDQ5092814

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Publication date: 25 July 2022

Published in: (Search for Journal in Brave)

Abstract: Two promising architectures for solid-state quantum information processing are electron spins in semiconductor quantum dots and the collective electromagnetic modes of superconducting circuits. In some aspects, these two platforms are dual to one another: superconducting qubits are more easily coupled but are relatively large among quantum devices $(simmathrmmm)$, while electrostatically-confined electron spins are spatially compact ($simmathrmmum$) but more complex to link. Here we combine beneficial aspects of both platforms in the Andreev spin qubit: the spin degree of freedom of an electronic quasiparticle trapped in the supercurrent-carrying Andreev levels of a Josephson semiconductor nanowire. We demonstrate coherent spin manipulation by combining single-shot circuit-QED readout and spin-flipping Raman transitions, finding a spin-flip time $T_S=17mathrmmus$ and a spin coherence time $T_{2E}=52mathrmns$. These results herald a new spin qubit with supercurrent-based circuit-QED integration and further our understanding and control of Andreev levels -- the parent states of Majorana zero modes -- in semiconductor-superconductor heterostructures.

Full work available at URL: https://arxiv.org/abs/2101.06701

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