Rare-earth ions in crystals are useful in precision measurements and quantum information science because of their exceptional optical and spin coherence properties. We show that the nuclear spin coherence time of $^{153}\mathrm{Eu}^{3+}$ ions doped into yttrium orthosilicate can be significantly enhanced by driving the environmental nuclear spins in the host crystal. This method of enhancing the spin coherence time can lead to improved precision measurements using rare-earth-doped crystals.Rare-earth ions in crystals are useful in precision measurements and quantum information science because of their exceptional optical and spin coherence properties. We show that the nuclear spin coherence time of $^{153}\mathrm{Eu}^{3+}$ ions doped into yttrium orthosilicate can be significantly enhanced by driving the environmental nuclear spins in the host crystal. This method of enhancing the spin coherence time can lead to improved precision measurements using rare-earth-doped crystals.

arXiv:2608.03939Physical Review AOct 27, 20260 citations

Current Quantum Information Science and Technology

Göran Pulkkis, Kaj J. Grahn

Advances in information quality and managementJul 31, 20140 citations

Photoluminescent Rare-Earth Qubits Embedded in a Metal–Organic Framework as Candidates for Optical Quantum Memories

Xiya Du, Lei Sun

Optical quantum memories enable long-distance quantum information distribution, which is critical for establishing the global quantum Internet. Rare-earth qubits are promising candidates due to their spin-optical interfaces with excellent spin coherence and optical properties. When doped into inorganic solids, they display relatively long excited-state lifetimes and, in turn, low storage efficiencies, which are difficult to optimize via material design. Metal–organic frameworks (MOFs) allow fine-tuning of spin coherence and excited-state lifetimes through rational design of coordination environments, thereby offering alternative platforms to host rare-earth qubits. By incorporating Nd 3+ and Yb 3+ into an oxalate-based MOF, we develop frameworks that exhibit spin decoherence time exceeding 5 μs at 3.4 K, near-infrared and/or telecommunication-band photoluminescence, and excited-state lifetimes up to 150 μs. These materials hold promise with long storage times and high storage efficiencies. Spin dynamics analysis reveals design principles to further improve coherence, promoting the development of rare-earth MOFs for quantum information science.Optical quantum memories enable long-distance quantum information distribution, which is critical for establishing the global quantum Internet. Rare-earth qubits are promising candidates due to their spin-optical interfaces with excellent spin coherence and optical properties. When doped into inorganic solids, they display relatively long excited-state lifetimes and, in turn, low storage efficiencies, which are difficult to optimize via material design. Metal–organic frameworks (MOFs) allow fine-tuning of spin coherence and excited-state lifetimes through rational design of coordination environments, thereby offering alternative platforms to host rare-earth qubits. By incorporating Nd 3+ and Yb 3+ into an oxalate-based MOF, we develop frameworks that exhibit spin decoherence time exceeding 5 μs at 3.4 K, near-infrared and/or telecommunication-band photoluminescence, and excited-state lifetimes up to 150 μs. These materials hold promise with long storage times and high storage efficiencies. Spin dynamics analysis reveals design principles to further improve coherence, promoting the development of rare-earth MOFs for quantum information science.

ACS Materials LettersMar 23, 20260 citations

Quantum science and technology with rare earth ions and nano-photonics

Andrei Faraon, Rikuto Fukumori, Will Pajak +1 more

Quantum Computing, Communication, and SimulationMar 5, 20260 citations

Magnetically Purified Erbium-doped Oxide Crystal--Towards Creating a Quantum-information-manipulation Platform

Takehiko Tawara, Tomohiro Inaba

Erbium (Er) is a rare-earth element that is expected to be a platform for manipulation of quantum information by utilizing telecommunication-wavelength photons.However, high-quality epitaxial growth of Er-doped host crystals is difficult, and the memory time of quantum information, which determines the performance of quantum manipulation, is much shorter than theoretically predicted.We investigated a good-compatibility rare-earth oxide as a host crystal for Er.The host oxide crystal, cerium oxide (CeO 2 ), had its nuclear spin removed (i.e., magnetically purified).The nuclear spin is the main factor that shortens the lifetime of quantum-information retention time.In this article, we describe high-quality epitaxial growth of CeO 2 and its optical properties as a thin film grown on a silicon substrate.Erbium (Er) is a rare-earth element that is expected to be a platform for manipulation of quantum information by utilizing telecommunication-wavelength photons.However, high-quality epitaxial growth of Er-doped host crystals is difficult, and the memory time of quantum information, which determines the performance of quantum manipulation, is much shorter than theoretically predicted.We investigated a good-compatibility rare-earth oxide as a host crystal for Er.The host oxide crystal, cerium oxide (CeO 2 ), had its nuclear spin removed (i.e., magnetically purified).The nuclear spin is the main factor that shortens the lifetime of quantum-information retention time.In this article, we describe high-quality epitaxial growth of CeO 2 and its optical properties as a thin film grown on a silicon substrate.

NTT technical reviewOct 1, 20191 citation

^{153}\mathrm{Eu}^{3+}

ions doped into yttrium orthosilicate can be significantly enhanced by driving the environmental nuclear spins in the host crystal. This method of enhancing the spin coherence time can lead to improved precision measurements using rare-earth-doped crystals.