Entangling microwaves with light

Quantum entanglement is a key resource in currently developed quantum technologies. Sharing would enable new functionalities, but this has been hindered by an energy scale mismatch of entanglement between microwave and optical fields in a millikelvin environment. Using an optically pulsed superconducting electro-optical device, we show entanglement between propagating microwave and optical fields in the continuous variable domain. This achievement not only paves the way for entanglement between superconducting circuits and telecom wavelength light, but also has wide-ranging implications for hybrid quantum networks in the context of modularization, scaling, sensing, and cross-platform verification.

Automated summary

Quantum entanglement is a crucial resource in current quantum technologies and sharing it would enable new functionalities. However, there has been an issue of energy scale mismatch between microwave and optical fields in a millikelvin environment. Through the use of an optically pulsed superconducting electro-optical device, we have achieved entanglement between propagating microwave and optical fields in the continuous variable domain. This achievement not only opens up possibilities for entanglement between superconducting circuits and telecom wavelength light, but also has significant implications for hybrid quantum networks in terms of modularity, scaling, sensing, and cross-platform verification.