Harnessing Quantum Entanglement: Controlling Randomness with Microwaves and Lasers

Researchers at the Institute of Science and Technology Austria (ISTA) have achieved the first-ever entanglement of microwave and optical photons, a significant step towards building a quantum network. Entangling photons of vastly different energy scales opens up possibilities for scaling up quantum hardware, interconnecting quantum computing platforms, and enabling quantum-enhanced remote sensing applications. The researchers used an electro-optic device to split an optical photon into entangled optical and microwave photons, overcoming the challenge of the large energy difference between the two. This breakthrough paves the way for the development of modular quantum computers with multiple separately cooled processor nodes, addressing the cooling limitations of superconducting qubits.