Thursday, Feb 22nd: Nano-photonic quantum light-matter interfaces based on rare-earth-doped crystals

Event Date: 

Thursday, February 22, 2018 - 3:45pm

Event Date Details: 

Refreshments served at 3:30pm.

Event Location: 

  • Elings Hall 1605
  • ABC...z Seminar Series

Quantum light-matter interfaces that reversibly mapphotonic quantum states onto atomic states, are essential components in thequantum engineering toolbox with applications in quantum communication,computing, and quantum-enabled sensing. I present a new platform for on-chipquantum light-matter interfaces based on nanophotonic resonators coupled torare-earth-ions in crystals.  Therare-earth ions exhibit long coherence times on optical transitions, which makesthem suitable for optical quantum memories. We demonstrate a high-fidelitynanophotonic quantum memory based on a mesoscopic neodymium ensemble coupled toa photonic crystal cavity. The nanocavity enables >95% spin polarization forefficient initialization of the atomic frequency comb memory, andtime-bin-selective readout via enhanced optical Stark shift of the combfrequencies. Our current technology can be readily transferred to Erbium dopeddevices for telecom memories that can be integrated with silicon photonics.Besides ensemble memories, single rare-earth-ions coupled to nano-resonatorscan be used as single optically addressable quantum bits where the quantumstate is mapped on their Zeeman or hyperfine levels with long coherence time.Our solid-state nano-photonic quantum light-matter interfaces can be integratedwith other chip-scale photon source and detector devices for multiplexedquantum and classical information processing at the nodes of quantum networks.I also discuss prospects for integration with superconducting resonators andqubits, which can lead to devices for reversible quantum transduction ofoptical photons to microwave photons, thus enabling optical interconnectsbetween superconducting quantum computers.

Andrei Faraon, Caltech