Ripples in the magnetic state of a material now directly interact with superconducting circuits, according to researchers at Argonne National Laboratory and the University of Illinois Urbana-Champaign. This creates a hybrid system combining spin waves and circuits that send and receive microwave signals, standard components for connecting and controlling signals within quantum information systems. The team demonstrated a method for quantum information transfer, where spin waves can excite microwaves in the circuit, enabling unidirectional propagation of a hybrid mode. This design, they report, makes the approach more relevant for compact, on-chip quantum technologies.
Spin Waves and Superconducting Circuits Enable Hybrid Quantum Systems
This coupling creates a hybrid system where information carried by magnetic ripples transitions into microwave signals, establishing a potential pathway for on-chip quantum information processing. Superconducting circuits function as essential components within many quantum systems, facilitating communication and control through the transmission and reception of microwave signals. The experimental device centers on a thin magnetic film designed to guide spin waves, with a superconducting circuit directly layered on top.
As spin waves propagate through the film, they induce microwave activity in the overlying circuit, a process enabled by precise tuning of the circuit to interact with the magnetic waves. This strong coupling between spin waves and microwaves allows for the creation of a hybrid mode of signal propagation, a key feature for controlling information flow. Researchers report that this design enables one-way propagation, meaning information travels in a single direction within the hybrid system.
This directional control stems from the inherent properties of spin waves, which, under specific conditions, exhibit a preference for traveling in one direction. This unidirectionality is advantageous for quantum systems, as it helps to isolate quantum components from unwanted noise that could corrupt calculations. In this latest work, the team successfully transferred the spin wave’s energy from the magnetic film into the superconducting circuit as microwaves, a critical step toward building more compact quantum technologies.
The research bridges two distinct areas of study: spin-wave magnonics, focused on the fundamental physics of materials, and superconducting quantum circuits, centered on microwave engineering for information processing. The team views this integration as a promising avenue for expanding the foundations of basic science to benefit quantum information science, potentially unlocking new methods for storing and manipulating quantum data. This work establishes a clear, one-way transfer of quantum information from spin waves to superconducting circuits; the reverse transfer has not yet been demonstrated.
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