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Steady-state entanglement of spin qubits mediated by nonreciprocal and chiral magnons

Martijn Dols1,*, Mikhail Cherkasskii1, Victor A. S. V. Bittencourt2, Carlos Gonzalez-Ballestero3, Durga B. R. Dasari4, and Silvia Viola Kusminskiy1,5,†

  • *Contact author: martijn.dols@rwth-aachen.de
  • †Contact author: kusminskiy@physik.rwth-aachen.de
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Phys. Rev. Research 8, 023310 – Published 17 June, 2026

DOI: https://doi.org/10.1103/w358-y2z9

Abstract

We propose a hybrid quantum system in which a magnet supporting nonreciprocal magnons, chiral magnons, or both mediates the dissipative and unidirectional coupling of spin qubits. By driving the qubits, the steady state of this qubit-qubit coupling scheme becomes the maximally entangled Bell state. We devise a protocol where the system converges to this entangled state and benchmark it including qubit decay and dephasing. The protocol is numerically tested on a hybrid system consisting of nitrogen-vacancy (NV) centers coupled to magnon surface modes of a yttrium iron garnet (YIG) film. We show that the dephasing time of the NV centers forms the bottleneck for achieving the entanglement of NV centers separated by a distance within the magnon coherence length. Our findings identify the key technological requirements and demonstrate a viable route toward steady-state entanglement of solid-state spins over distances of several microns using magnonic quantum networks, expanding the toolbox of magnonics for quantum information purposes.

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Phys. Rev. Research 8, 023310– Published 17 June, 2026
  • Received 17 September 2025
  • Accepted 21 May 2026
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