Argonne National Laboratory and the University of Illinois Urbana-Champaign have demonstrated a hybrid circuit in which propagating magnetic spin waves in an epitaxial yttrium iron garnet (YIG) film couple strongly to microwave photons in a superconducting resonator. Because the Damon–Eshbach spin-wave geometry supports nonreciprocal radiation, the hybrid mode can favor one propagation direction—a potential basis for on-chip microwave isolation in future quantum hardware.
The result, published in Physical Review Letters on 10 September 2026, is a materials and device proof of concept. It is not a quantum computer or a finished commercial isolator, but it shows that a low-loss magnetic waveguide and a superconducting microwave circuit can operate as one coupled platform.
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What the team built
The device places a superconducting microwave resonator directly on an epitaxial YIG thin film. YIG is a ferrimagnetic material in which collective spin excitations can travel as waves. In the resonator, the corresponding microwave excitation is described as a photon mode. Fabricating the resonator on the magnetic film lets the two systems exchange energy coherently rather than coupling through a separate macroscopic component.
The film was grown on Y3Sc2Ga3O12, a rare-earth-free substrate. That substrate choice addresses a problem that had limited cryogenic hybrid devices: rare-earth ions in earlier YIG growth platforms can absorb microwave energy at low temperature, adding loss and washing out the interaction the circuit is meant to preserve.
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How spin waves couple to a superconducting circuit
A spin wave is a propagating collective motion of a material’s magnetization. In this experiment, the resonator’s microwave magnetic field overlaps the YIG film. When the frequency and field configuration bring a spin-wave mode into resonance with the microwave mode, energy can oscillate between them. The resulting excitation is a hybrid magnon-photon mode rather than a purely magnetic wave or a purely electrical resonator signal.
The paper reports strong coupling for both major propagating geometries tested:
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| Spin-wave mode | Propagation configuration | Reported interaction | Directionality reported? |
|---|---|---|---|
| Damon–Eshbach | Magnetization and wavevector arranged for surface-like propagation | Strongly coupled to the superconducting resonator | Yes. Nonreciprocal radiation of the hybrid magnonic mode was observed |
| Backward-volume | Wave propagation aligned with the magnetization | Strongly coupled to the superconducting resonator | Strong coupling was reported; the supplied publication abstracts do not assign the same nonreciprocal result to this mode |
“Strong coupling” has a specific meaning here: the coherent exchange rate exceeds the damping rates of the magnon and photon modes. In practical terms, the two excitations can communicate before losses erase the information. The accessible publication abstracts do not give one headline coupling rate, operating temperature or isolation ratio, so those numbers should not be inferred from the demonstration.
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Why this can behave like a one-way street
Many ordinary microwave links are reciprocal: a signal travels forward and a reflected signal can travel backward through the same path. Spin-wave propagation can become nonreciprocal when the magnetic field, film geometry and wavevector are arranged appropriately. In the Damon–Eshbach configuration used here, the researchers observed nonreciprocal radiation from the hybrid magnonic mode.
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That asymmetry means the coupled magnetic-resonator system can favor one direction for launching or receiving a microwave signal. A future circuit could use this behavior to reduce unwanted return signals, a function associated with microwave isolators. The present work establishes the physical platform for that idea; it does not report a completed isolator with a specified isolation figure.
The materials breakthrough behind the device
YIG is attractive for hybrid quantum hardware because it can support low-loss magnetic excitations. The difficulty is integrating high-quality YIG with a superconducting circuit while keeping losses low at cryogenic temperatures. Rare-earth-containing substrates used in earlier growth approaches introduced microwave absorption from their ions.
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Switching to the rare-earth-free Y3Sc2Ga3O12 substrate allowed the team to grow the magnetic film and fabricate the resonator on it without that specific source of loss. Argonne first author Yi Li described the achievement as a proof of concept for a platform that had previously been blocked by the materials challenge.
Why the result matters for quantum information
Superconducting circuits are widely used to generate, control and detect microwave quantum states. Magnonics contributes propagating magnetic excitations and, under suitable conditions, intrinsic directionality. Combining them could eventually provide compact on-chip routing, buffering or isolation elements inside larger cryogenic systems.
The work also connects three engineering areas that are often developed separately: spin-wave magnonics, cavity magnonics and superconducting-circuit design. A successful interface could let a superconducting circuit hand information to a magnetic wave, direct that wave preferentially, and convert it back to a microwave signal elsewhere on a chip.
What this demonstration does—and does not—show
- It does show: propagating YIG spin waves can couple strongly to microwave photons in a resonator fabricated directly on the film.
- It does show: both Damon–Eshbach and backward-volume modes meet the strong-coupling condition relative to their reported damping rates.
- It does show: the Damon–Eshbach hybrid mode has observed nonreciprocal radiation, the physical ingredient for directional signal flow.
- It does not show: a complete quantum processor, a demonstrated quantum-information algorithm or a commercial product.
- It does not establish: a single benchmark value for coupling rate, operating temperature or microwave isolation from the information available in the publication abstracts.
Publication timeline
The peer-reviewed paper, Yi Li et al., “Strong Coupling between Propagating Spin Waves and Microwave Photons in a Superconducting Resonator,” appeared in Physical Review Letters 137, 116706, on 10 September 2026 (DOI: 10.1103/8t91-w9nn). The corresponding arXiv preprint was submitted on 25 June 2026.
What researchers will need to solve next
Turning this proof of concept into a useful component will require measurements beyond demonstrating strong coupling. Important evaluation points include the propagation-direction contrast, total magnon and photon loss, coupling relative to each mode’s linewidth, stability of the rare-earth-free film and substrate at cryogenic temperatures, and how densely the structures can be integrated. A practical device must also demonstrate an information-routing or isolation function, not merely an avoided crossing or energy exchange between modes.
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