Quantum nano-photonics with rare-earth ions

Andrei Faraon, Rikuto Fukumori, Will Pajak +1 more

Andrei Faraon

Andrei Faraon

In this talk I give an overview of our recent work on quantum nano-photonic devices based on rare-earth ions. The rare-earth ions exhibit excellent optical and spin coherence properties when embedded in nano-photonic devices. This enables on-chip optical quantum memories, single rare-earth-ion optically addressable quantum bits, and devices for quantum transduction. I will focus on our recent results based on ytterbium 171 in yttrium orthovanadate.

Andrei Faraon

I present quantum nano-photonic devices based on nanophotonic resonators coupled to rare-earth-ions in crystals. The rare-earth ions exhibit long coherence times on optical transitions, which makes them suitable for optical quantum memories. We demonstrate a high-fidelity nanophotonic quantum memory based on a mesoscopic rare-earth ensemble coupled to a photonic crystal cavity. The nanocavity enables >95% spin polarization for efficient initialization of the atomic frequency comb memory, and time-bin-selective readout via enhanced optical Stark shift of the comb frequencies. Besides ensemble memories, single rare-earth-ions coupled to nano-resonators can be used as single optically addressable quantum bits where the quantum state is mapped on their Zeeman or hyperfine levels with long coherence time. Our solid-state nano-photonic quantum light-matter interfaces can be integrated with other chip-scale photon source and detector devices for multiplexed quantum and classical information processing at the nodes of quantum networks.

Baldassare Di Bartolo, Silvestri, Luciano, Cesaria, Maura +1 more

Andrei Faraon

I present our progress towards developing optical quantum memories based on photonic crystal cavities fabricated in rare-earth-doped crystals. These devices exhibit large spontaneous emission rate enhancement, enabling optical control of single rare-earth ion quantum bits.