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Quantum Circuit Design Gate Engineering

Loopless multiterminal quantum circuits at odd parity

arXiv
Authors: Antonio Manesco, Anton Akhmerov, Valla Fatemi

Year

2026

Paper ID

3616

Status

Preprint

Abstract Read

~2 min

Abstract Words

84

Citations

N/A

Abstract

We theoretically investigate loopless multiterminal hybrid superconducting devices at odd fermion parity with time-reversal symmetry. We find that the energy-phase relationship has a double minimum corresponding to opposite windings of the superconducting phases. Spin-orbit coupling adds multi-axial spin splittings, which contrasts with two-terminal devices where spin dependence is uniaxial. Capacitive shunting localizes quantum circuit states in the wells and exponentially suppresses their splitting. For weak spin-orbit strength, the system has a four-dimensional spin-chirality low-energy subspace which can be universally controlled with electric fields only.

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  • We theoretically investigate loopless multiterminal hybrid superconducting devices at odd fermion parity with time-reversal symmetry.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2601.13369 [2] arXiv https://arxiv.org/abs/2601.13369 [3] Publisher https://arxiv.org/abs/2601.13369

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