Optical quantum networks based on rare-earth ions
Abstract
We propose to develop new nano-fabrication and testing capabilities for on-chip nano-photonic devices in materials like yttrium orthovanadate (YVO4) doped with lanthanides (rare-earth ions) such as ytterbium. These capabilities are essential for advancing current DoD projects related to optical quantum networks and microwave to optical transduction, supported by AFOSR and ONR. With AFOSR support, we are currently working on developing optical quantum networks based on single ytterbium 171 ions coupled to optical resonators. We already demonstrated entanglement of two ytterbium ions in two separate devices and are currently working towards entangling three ions. This platform has all the necessary ingredients to demonstrate multi-node optical quantum repeater networks. With ONR support we are using similar devices, but this time based on ensembles of ytterbium 171 ions, to demonstrate microwave to optical transduction where single microwave photons from superconducting qubits can be converted to single optical photons. This technology will enable remote entanglement of superconducting qubits via optical channels. The vision is that in the future the transduction project and the single qubit quantum networking project will be merged by showing entanglement between single ytterbium ions and superconducting qubits, and then integration of superconducting qubits into long distance quantum networks. Towards this vision, we must further develop the nano-photonic platform and the experimental setup. Currently, one of the bottlenecks in the experiment is the relatively low throughput fabrication based on focused ion beam milling followed by low temperature characterization. We are requesting funds for low temperature measurement setup that will enable faster screening of devices, and a tool for processing crystalline substrates for alternate fabrication methods. In the laboratory, the experimental setup is increasing in complexity and requires more advanced optical and electronic control. We are requesting funds for optical testing infrastructure, fast microwave signal generation, signal measurement, and electronic control with real-time feedback.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410084
Entities
People
- Andrei Faraon
Organizations
- Air Force Office of Scientific Research
- California Institute of Technology
- United States Air Force