Robust Nonclassical magnon pair generation and Cauchy-Schwarz inequality violation in a hybrid electromagnonic system

Abstract:Magnonic systems are a promising resource for quantum technologies because of their ability to couple significantly disparate quantum platforms and the generation of nonclassical magnon states through magnon blockade has attracted growing attention. In practice, however magnon blockade relies on a destructive interference that is easily spoiled by fabrication-induced coupling asymmetries. Here we show that the relative phase between two magnon drives acts as an active compensation knob that restores this interference even when the couplings are mismatched. We study two Kittel magnon modes in a hybrid system in which a superconducting qubit coupled to a common cavity mode mediates the inter-mode interaction and we find that tuning the drive phase produces both magnon blockade and a strong violation of the classical Cauchy--Schwarz inequality. We derive the analytic condition for the phase that compensates a given coupling asymmetry and confirm it against exact numerical simulations. The drive phase thereby serves as a control knob that switches the system between classical and quantum regimes. Our results enable phase-controlled magnonic quantum information processing.

arXiv:2608.01741 [quant-ph]

(or arXiv:2608.01741v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2608.01741 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.

Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them.

Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs.