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

• URL: http://arxiv.org/abs/2509.13094v1
• Date: Tue, 16 Sep 2025 13:52:10 GMT
• Title: Steady-state entanglement of spin qubits mediated by non-reciprocal and chiral magnons
• Authors: Martijn Dols, Mikhail Cherkasskii, Victor A. S. V. Bittencourt, Carlos Gonzalez-Ballestero, Durga B. R. Dasari, Silvia Viola Kusminskiy,
• Abstract summary: We propose a hybrid quantum system in which a magnet supports non-reciprocal magnons, chiral magnons, or both.<n>By driving qubits, the steady state of this qubit-qubit coupling scheme becomes the maximally entangled Bell state.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a hybrid quantum system in which a magnet supporting non-reciprocal 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 an 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 exceeding microns. 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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