Periodic Reporting for period 1 - OMNI (On-chip quantum MagNonIcs)
Période du rapport: 2022-01-01 au 2023-12-31
In the innovative project on-chip quantum magnonics (OMNI), we have successfully attained our goal of producing prototype integrated magnonic three-terminal devices (3-TDs) through cutting-edge design, fabrication, and testing. With this breakthrough, we are set to revolutionise the emerging field of integrated quantum magnonics and hybrid quantum systems. Our demonstration of propagating spin waves at millikelvin temperatures and the realisation of 3-TDs will provide the scientific community with a powerful, flexible, and adaptable platform that can be used to construct larger quantum magnonic circuits. With this platform, we can potentially achieve the first-ever magnonic Hong-Ou-Mandel interference experiment or demonstrate photon-magnon entanglement. Our achievements in the OMNI project are significant milestones in the field of quantum magnonics and will pave the way for future advances in this exciting field.
Our team has made significant strides in understanding the underlying physics of spin waves in integrated devices at millikelvin temperatures. Through our research, we have successfully demonstrated for the first time the propagation of spin waves in a nanometer-thin ferrimagnet called yttrium-iron-garnet at ultra-low temperatures, using an advanced all-electrical spectroscopy method to excite and detect these waves. We have discovered and revealed the role of paramagnetic gadolinium-gallium-garnet, which modifies crystallographic anisotropy and, while partially magnetised at low temperatures, induces a strongly non-uniform stray field. Having this knowledge, we have designed, fabricated and tested prototypes of the 3-TD within the yttrium-iron-garnet nanowaveguide of cross-section down to fifty-nanometer and three terminals suitable for exciting, manipulating and detecting spin waves.
Our findings have been disseminated in over 20 conferences, workshops, and general scientific presentations. The OMNI project and its partner projects have resulted in multiple peer-reviewed journal publications, with three already published, one proceeding, two under consideration, and four in preparation. Two doctoral, two Master's and two Bachelor’s students were involved in the investigations. Our team remains committed to advancing our understanding of spin waves and their potential applications. Our ground-breaking research will excel in the quantum magnonic research field, and we are excited to continue sharing our findings with the scientific community.
Our findings have been disseminated in over 20 conferences, workshops, and general scientific presentations. The OMNI project and its partner projects have resulted in multiple peer-reviewed journal publications, with three already published, one proceeding, two under consideration, and four in preparation. Two doctoral, two Master's and two Bachelor’s students were involved in the investigations. Our team remains committed to advancing our understanding of spin waves and their potential applications. Our ground-breaking research will excel in the quantum magnonic research field, and we are excited to continue sharing our findings with the scientific community.
The OMNI project achieved three significant results that go beyond the state-of-the-art. Firstly, we demonstrated the first-ever all-electrical propagating spin-wave spectroscopy at ultra-low temperatures in thin yttrium-iron-garnet. This has only been realised in magnonic structures at room temperature before. Secondly, we found that gadolinium-gallium-garnet is magnetised, shifts the frequencies of the FMR and influences the propagation characteristics due to the induced stray fields at these low temperatures, due to the induced gadolinium-gallium-garnet stray fields at such low temperatures. Additionally, we explained the influence of gadolinium-gallium-garnet on yttrium-iron-garnet at millikelvin temperatures, which had not been done before. Finally, we demonstrated fabricated prototype integrated magnonic three-terminal devices (3-TD) within the yttrium-iron-garnet nanowaveguides of cross-section down to fifty-nanometer and three terminals suitable for exciting, manipulating and detecting spin waves. Our 3-TD allows for the optical and all-electrical excitation and detection of magnons at room and cryogenic temperatures. With this platform, we have the potential to achieve the first-ever magnonic Hong-Ou-Mandel interference experiment or demonstrate photon-magnon entanglement.