Quantum Nano-Photonic Devices based on Rare-Earth-Doped Crystals

Rare earth ions (Lanthanides) doped in crystals have excellent optical and electron spin coherence. Rare-earth doped crystals are widely used in lasers and more recently in optical quantum memories. We are developing nano-photonic devices in rare-earth doped crystals that will lead to highly efficient optical quantum memories, highly coherent optical quantum bits, and devices for efficient quantum conversion between optical photons and microwae photons. The image below shows a photonic crystal nano-resonator fabricated in neodymium doped yttrium orthosilicate (Nd:YSO). We are also with Er doped crystals.