Molecular Optomagnonics Achieves Nonreciprocal Quantum Correlations, Robust up to 77K, Via Barnett Effect

Correlations between quantum particles underpin many emerging technologies, and scientists continually seek ways to create and control these interactions, even in noisy environments. E. Kongkui Berinyuy from University of Yaounde I, A. -H. Abdel-Aty from University of Bisha, P. Djorwe, and colleagues demonstrate a theoretical approach to generating nonreciprocal quantum correlations, including discord and Einstein-Podolsky-Rosen entanglement, using the Barnett effect within a molecular optomagnonic system. This innovative scheme combines a yttrium iron garnet sphere with molecules inside a microwave cavity, and the researchers identify specific conditions that maximise these nonreciprocal correlations. Importantly, the generated correlations prove remarkably resilient to thermal fluctuations, persisting at relatively high temperatures, which suggests a new pathway for developing robust, noise-tolerant quantum devices by integrating magnons with molecular systems.

Cavity optomagnonic platforms offer a promising route for exploring quantum phenomena, particularly quantum correlations, which are vital resources for modern quantum technologies. Here, the researchers propose a theoretical scheme for achieving nonreciprocal quantum correlations such as entanglement, quantum discord, and Einstein-Podolsky-Rosen (EPR) correlations via the Barnett effect in a molecular-optomagnonic system. This system involves a yttrium iron garnet sphere placed in a microwave cavity.

Molecular Optomagnonics for Quantum Correlation Generation

Researchers developed a novel approach to generate and enhance quantum correlations within a molecular-optomagnonic system, a platform combining yttrium iron garnet spheres with molecules hosted inside a microwave cavity. This work centers on harnessing the Barnett effect, a phenomenon where rotating magnetic moments induce effective forces, to achieve nonreciprocal correlations, specifically discord and Einstein-Podolsky-Rosen (EPR) entanglement. The team engineered a system where the interplay between the molecular and magnonic components facilitates the generation of these correlations, offering a pathway toward advanced quantum technologies. Scientists then explored optimal parameter regimes to maximize the nonreciprocal correlations generated through the Barnett effect, carefully tuning the system’s properties to enhance the desired quantum phenomena.

The researchers demonstrated that the generated correlations are remarkably robust, persisting even at elevated temperatures reaching 0. 21 degrees, a significant advancement for practical applications. This innovative methodology allows for the creation of noise-tolerant correlations, addressing a key challenge in quantum information processing. The team’s work suggests a new tool for engineering quantum states, paving the way for novel nonreciprocal devices by integrating magnons, quantized spin waves, with molecular ensembles.

Robust Entanglement via Molecular Optomechanics

This research explores the potential for creating robust, high-temperature quantum entanglement using a novel molecular optomechanical system. The core idea centers on a system where molecular vibrations are strongly coupled to both optical and mechanical degrees of freedom within a microcavity. This coupling, combined with the Barnett effect, is leveraged to generate and enhance nonreciprocal entanglement, a type of entanglement that is robust against backscattering and loss. The key findings demonstrate that the proposed system is designed to maintain entanglement at relatively high temperatures, overcoming a major hurdle in quantum technologies. The nonreciprocal nature of the interactions protects the entanglement from decoherence caused by backscattering and losses. This research has implications for various quantum technologies, including quantum communication, quantum sensing, and quantum information processing.

Robust Quantum Correlations Via Barnett Effect

This research demonstrates a novel approach to generating and controlling quantum correlations, specifically entanglement, EPR steering, and quantum discord, within a system combining magnons and molecular ensembles. Scientists successfully theorize a method for achieving nonreciprocal correlations via the Barnett effect, where a yttrium iron garnet sphere interacts with molecules within a microwave cavity. The findings reveal that these quantum correlations can be effectively tuned by manipulating the Barnett frequency shift, with optimal results achieved when this shift is negative. Notably, the generated entanglement exhibits remarkable robustness against thermal fluctuations, persisting at temperatures as high as 6000 K.

This resilience stems from the collective vibrational properties of the molecular ensemble, which creates strong coupling strengths that overcome thermal noise. The team acknowledges that this work is theoretical, but highlights the experimental feasibility of realizing this magnon-molecular system with current or near-future technology. This achievement suggests a promising platform for high-temperature quantum information processing and quantum sensing, potentially enabling robust and tunable nonreciprocal entanglement without the need for cryogenic cooling.