WO2026062504 - TECHNOLOGIES FOR LONG OPTICAL COHERENCE TIMES IN A RARE-EARTH-DOPED ANTIFERROMAGNET

National phase entry is expected:
Publication Number WO/2026/062504
Publication Date 26.03.2026
International Application No. PCT/IB2025/059288
International Filing Date 17.09.2025
Title **
[English] TECHNOLOGIES FOR LONG OPTICAL COHERENCE TIMES IN A RARE-EARTH-DOPED ANTIFERROMAGNET
[French] TECHNOLOGIES POUR TEMPS DE COHÉRENCE OPTIQUE LONGS DANS UN ANTIFERRO-AIMANT DOPÉ AUX TERRES RARES
Applicants **
OTAGO INNOVATION LIMITED
UNIVERSITY OF OTAGO
HIRAISHI, Masaya
ROBERTS, Zachary H.
KING, Gavin
TRAINOR, Luke
LONGDELL, Jevon
Inventors
HIRAISHI, Masaya
ROBERTS, Zachary H.
KING, Gavin
TRAINOR, Luke
LONGDELL, Jevon
Priority Data
63/695,640   17.09.2024   US
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China Filing, Examination, Granting2420
EPO Filing, Examination, Granting16687
Japan Filing, Examination, Granting2464
South Korea Filing, Examination, Granting2802
USA Filing, Examination, Granting5310
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Abstract[English] A rare-earth-doped antiferromagnetic crystal is disclosed, designed to achieve long optical coherence times and enable coherent coupling between optical and magnon modes. The crystal includes a host lattice, such as gadolinium vanadate, gadolinium oxide, or gadolinium silicate, which is antiferromagnetic below a Néel temperature and is doped with a second rare-earth ion, such as erbium. By operating at cryogenic temperatures, electron spins in the host are magnetically ordered, providing a quiet magnetic environment that minimizes decoherence for the dopant ions. The system achieves long optical coherence times for the rare-earth dopant ions, supporting robust quantum memory and communication. Additionally, coherent coupling between the optical transitions of the dopant and magnon modes of the host enables efficient microwave-to-optical quantum transduction. Isotopic purification of the host and/or dopant ions can further reduce nuclear spin noise, enhancing coherence times.[French] La divulgation concerne un cristal antiferromagnétique dopé aux terres rares, conçu pour obtenir des temps de cohérence optique longs et permettre un couplage cohérent entre des modes optique et magnon. Le cristal comprend une matrice hôte, tel que le vanadate de gadolinium, l'oxyde de gadolinium ou le silicate de gadolinium, qui est antiferromagnétique au-dessous d'une température de Néel et est dopé avec un second ion de terre rare, tel que l'erbium. En fonctionnant à des températures cryogéniques, des spins d'électrons dans l'hôte sont ordonnés magnétiquement, fournissant un environnement magnétique calme qui réduit au maximum la décohérence pour les ions dopants. Le système permet d'obtenir de temps de cohérence optique longs pour les ions dopants de terres rares, appuyant une mémoire quantique et une communication robustes. De plus, un couplage cohérent entre les transitions optiques des modes dopant et magnon de l'hôte permet une transduction quantique micro-onde-optique efficace. La purification isotopique de l'hôte et/ou des ions dopants peut en outre réduire le bruit de spin nucléaire, améliorant les temps de cohérence.