Chiral Magnetic Josephson junction: a base for low-noise superconducting qubits?

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.
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https://hal.archives-ouvertes.fr/hal-02263645
Contributor : Maxim Chernodub <>
Submitted on : Monday, August 5, 2019 - 2:04:58 PM
Last modification on : Tuesday, August 6, 2019 - 1:20:04 AM

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  • HAL Id : hal-02263645, version 1
  • ARXIV : 1908.00392

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M. N. Chernodub, J. Garaud, D. E. Kharzeev. Chiral Magnetic Josephson junction: a base for low-noise superconducting qubits?. 2019. ⟨hal-02263645⟩

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