REVIEW 53 references
Chiral Magnetic Josephson junction: a base for low-noise superconducting qubits?
T0 review · reviewed 2026-08-14 · deepseek-v4-flash
Pith's one-line read A ferromagnet inside a Josephson junction between two non-centrosymmetric superconductors produces a phase offset tunable by magnetization, enabling a flux-bias-free superconducting qubit.
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
Extended reading notes
Core claim
The paper claims the junction current is J = J0 sin(phi - phi_g) with phi_g = e h_x K L (Eqs. (11)-(12)), and that the resulting chiral magnetic qubit needs no external flux bias and is protected from magnetization noise. If correct, this provides a magnetization-tunable, flux-bias-free Josephson qubit element.
Load-bearing premise
The derivation assumes the exchange field h of the ferromagnet can be substituted for the magnetic field B in the Lifshitz invariant (K/2) h·j with the same coupling constant K (Eq. (4) and accompanying text). If exchange fields couple to the supercurrent differently than orbital magnetic fields, the phase offset formula phi_g = e h_x K L fails. This enters before Eq. (7) and is the premise on which the entire prediction rests.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Assumptions & free parameters
free parameters (1)
- K (parity-odd magnetoelectric coupling) =
K ≈ (10^-3 to 10^-2) lambda, with lambda ≈ 0.1-1 um
assumptions (5)
- domain assumption GL free energy (4) with single-component order parameter and Lifshitz invariant (K/2) j·h describes non-centrosymmetric superconductors with O point-group symmetry.
- ad hoc to paper The exchange field h of the ferromagnet plays the same role as the magnetic field B in the Lifshitz invariant, with the same coupling constant K.
- domain assumption Rigid boundary conditions (10) with continuity of the order parameter at the NCS/F interfaces and no interface barrier.
- domain assumption The weak link is in the normal state and the quartic term in the GL free energy is neglected; no pair-breaking term h^2|psi|^2 is included.
- domain assumption A uniaxial ferromagnet with easy axis along the current has stable h_x and longitudinal fluctuations suppressed by a factor cT/T_C ≈ 10^-4 to 10^-5 at millikelvin temperatures.
Cite this review
Pith. "Pith review of Chiral Magnetic Josephson junction: a base for low-noise superconducting qubits?." pith.science (2026). https://pith.science/paper/67NF7TQU
@misc{pith2026190800392,
author = {Pith},
title = {Pith review of: Chiral Magnetic Josephson junction: a base for low-noise superconducting qubits?},
year = {2026},
howpublished = {\url{https://pith.science/paper/67NF7TQU}},
note = {Machine review of arXiv:1908.00392}
}
read the original abstract
Superconducting materials with non-centrosymmetric lattices lacking the space inversion symmetry are known to exhibit a variety of interesting parity-breaking phenomena, including the anomalous Josephson effect. Here we consider a Josephson junction consisting of two non-centrosymmetric superconductors (NCSs) connected by a uniaxial ferromagnet, and demonstrate that it exhibits a direct analog of the Chiral Magnetic Effect observed in Dirac and Weyl semimetals. We propose to use this "Chiral Magnetic Josephson junction" (CMJ junction) as an element of a qubit with a Hamiltonian tunable by the ferromagnet's magnetization. The CMJ junction allows to avoid the use of an offset magnetic flux in inductively shunted qubits, thus enabling a simpler and more robust architecture. The resulting"`chiral magnetic qubit" is protected from the noise caused by fluctuations in magnetization when the easy axis of the uniaxial ferromagnet is directed across the junction.
Figures
Reference graph
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