Path Entanglement of Continuous-Variable Quantum Microwaves

Understand

Path entanglement constitutes an essential resource in quantum information and communication protocols.

• Here, we demonstrate frequency-degenerate entanglement between continuous-variable quantum microwaves propagating along two spatially separated paths.
• We combine a squeezed and a vacuum state using a microwave beam splitter.
• Via correlation measurements, we detect and quantify the path entanglement contained in the beam splitter output state.