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Resolving Andreev spin qubits in germanium-based Josephson junctions
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Resolving Andreev spin qubits in germanium-based Josephson junctions
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Andreev spin qubits (ASQs) are a promising platform for quantum information processing which benefit from both the small footprint of semiconducting spin qubits and the long range connectivity of superconducting qubits. While state-of-the-art experiments have developed ASQs in InAs nanowires, these realizations are coherence-time limited by nuclear magnetic noise which cannot be removed by isotopic purification. In Ge-based Josephson junctions, which can be isotopically purified, Andreev states have been experimentally observed but spin-resolved Andreev states remain elusive. Here, we theoretically demonstrate that the geometry of the Josephson junction can limit the qubit frequency to values below typical experimental temperatures and render the ASQ effectively invisible. ASQs could be experimentally resolved by judiciously choosing the geometry of the junction and filling of the underlying Ge. Our comprehensive study of ASQ frequency on in situ and ex situ experimentally controllable parameters provides design guidance of Ge-based Josephson junctions and paves the way towards realization of high-coherence ASQs.
Forward citations
Cited by 4 Pith papers
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Strain engineering of Andreev spin qubits in Germanium
Compressive strain suppresses spin splitting in germanium Josephson junctions while tensile or unstrained heterostructures enable GHz-scale splittings for Andreev spin qubits via enhanced spin-orbit effects.
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Granular aluminum induces a hard, magnetically resilient superconducting gap of 305 μeV in germanium, allowing Zeeman splitting of YSR states beyond 50 μeV and g-tensor tunability for hole-based hybrid quantum devices.
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Strain engineering of Andreev spin qubits in Germanium
Numerical simulations predict that tensile or unstrained germanium heterostructures yield spin splittings over 100 times larger than compressive cases, enabling GHz Andreev spin qubits with 100 ns all-electric gates.
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