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Minimal Experimental Test of Photon-Magnon Quantum Addressing: A Single-Channel Proof-of-Concept Proposal

Marco Glamngiw

Published Feb 1, 2026• 0 citations
Publisher

Abstract

We propose a minimal experimental test to validate photon-magnon quantum state transfer for memory applications. Using established YIG-cavity technology, we demonstrate single-channel quantum addressing with one bit of information. Success criteria: coherence > 1 microsecond, fidelity > 50%. Estimated cost: $50-100k with existing infrastructure. This proposal is a companion to: "Towards Magnetic Field Quantum Memory" (Glamngiw, 2026), DOI: 10.5281/zenodo.18451271 Keywords: photon-magnon coupling, quantum memory, experimental proposal, YIG cavity, coherenc

DOI
10.5281/zenodo.18451385

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We propose a minimal experimental test to validate photon-magnon quantum state transfer for memory applications. Using established YIG-cavity technology, we demonstrate single-channel quantum addressing with one bit of information. Success criteria: coherence > 1 microsecond, fidelity > 50%. Estimated cost: $50-100k with existing infrastructure. This proposal is a companion to: "Towards Magnetic Field Quantum Memory" (Glamngiw, 2026), DOI: 10.5281/zenodo.18451271 Keywords: photon-magnon coupling, quantum memory, experimental proposal, YIG cavity, coherenc
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This paper analyzes fundamental physical constraints on magnon-based quantum memory systems. We examine collective-mode behavior and magnetohydrodynamic (MHD) limits that govern the scalability of photon-magnon quantum state transfer. Key findings: - Spin wave propagation limits spatial addressing resolution - Magnetic Reynolds number R_m ≈ 10⁻¹² confirms diffusion-dominated regime - Maximum achievable channels: N_max ~ 10³-10⁴ via frequency-based addressing - Channel crosstalk analysis provides design guidelines This work complements the theoretical framework (Paper I) and experimental proposal (Paper II) in a three-paper series on magnetic quantum memory. Keywords: quantum memory, magnons, spin waves, magnetohydrodynamics, photon-magnon coupling
In the emerging field of cavity optomagnonics, photons are coupled coherently to magnons in solid-state systems. These new systems are promising for implementing hybrid quantum technologies. Being able to prepare Fock states in such platforms is an essential step towards the implementation of quantum information schemes. We propose a magnon-heralding protocol to generate a magnon Fock state by detecting an optical cavity photon. Due to the peculiarities of the optomagnonic coupling, the protocol involves two distinct cavity photon modes. Solving the quantum Langevin equations of the coupled system, we show that the temporal scale of the heralding is governed by the magnon-photon cooperativity and derive the requirements for generating high fidelity magnon Fock states. We show that the nonclassical character of the heralded state, which is imprinted in the autocorrelation of an optical ``read'' mode, is only limited by the magnon lifetime for small enough temperatures. We address the detrimental effects of nonvacuum initial states, showing that high fidelity Fock states can be achieved by actively cooling the system prior to the protocol.
Realizing a strong light-matter interaction via magnetic dipoles is of fundamental importance in physics, and a cavity magnonics system has provided a unique platform to achieve strong and even ultrastrong light-matter interaction. In this work, transparency induced by magnon-photon interactions in cavity quantum electrodynamics (QED) system coupling a yttrium-iron-garnet (YIG,Y3Fe5O12) (YIG) sphere has been investigated. The spectral separation reveals a linear relationship with the coupling strength, which might find applications in magnon dark state and magnon-based quantum information processing.
I will introduce the fundamental requirements for practically linking quantum objects into large-scale coherent quantum systems as well as the advantages of coherent magnonics for next-generation quantum coherent systems (i.e., spin-entangling quantum gates). Other critical challenges for quantum information science then will motivate the development of coherent magnonics for quantum transduction from “stationary” spin systems to “flying” magnons and for quantum memory. Finally, the advantages of all-magnon quantum information technologies that rely on manipulating and encoding quantum information in superpositions of fixed magnon number states will highlight the potential of new magnetic materials, devices, and systems.