Quantum entanglement between optical and microwave photonic qubits

Physical Review X (2024)

 

A research team introduces a device that produces entangled pairs of photons — one in the optical range and one in the microwave range — on a small chip.
Their device combines a piezo-optomechanical transducer with a superconducting resonator, which together generate entangled pairs of photons that are both resilient to light and stable. To verify the entangled state, the team measured both the microwave and optical photons in two different ways, enabling them to estimate how closely the state of one photon was linked to the other.

This source of entangled photons could connect telecom-based qubits (for quantum communication) with superconducting qubits (for quantum computing), bridging two major platforms in quantum technology.

The papers authors are Srujan Meesala, David Lake, Steven Wood, Piero Chiappina, Changchun Zhong, Andrew Beyer, Matthew Shaw, Liang Jiang and Oskar Painter, who conducted their work at Caltech, the University of Chicago, and Amazon Web Services.