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This research demonstrates a novel method for detecting fermion parity in superconductors by utilizing carbon nanotube-based Andreev molecules with dual quantum-dot Josephson junctions. The ability to read out this fundamental property via nonlocal phase shifts offers a critical pathway for encoding and manipulating information within hybrid superconducting circuits, advancing the hardware necessary for topological qubits.

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École Polytechnique Lab Probes Fermion Parity with Josephson Effect

Quantum ZeitgeistJuly 20, 20265 min read

Researchers at Laboratoire de Physique de la Matière condensée, CNRS, École polytechnique, detected fermion parity in a superconducting state using a carbon nanotube Andreev molecule with two quantum-dot Josephson junctions.

Researchers at École Polytechnique, CNRS have demonstrated a new method for detecting fermion parity, a fundamental property of superconductivity, by utilizing a carbon nanotube-based Andreev molecule. The work employs two coupled quantum-dot Josephson junctions to observe the formation of delocalized Andreev molecular states extending across both junctions, a key step in controlling these complex systems. Changes in the molecular ground-state parity manifest as characteristic phase shifts in the nonlocal response, identifying global fermion parity as an experimentally accessible degree of freedom. This approach could prove relevant for devices designed to encode quantum information…

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