Path Entanglement of Continuous-Variable Quantum Microwaves

TL;DR

This paper demonstrates frequency-degenerate path entanglement between continuous-variable quantum microwaves, enabling advanced quantum communication protocols at microwave frequencies.

Contribution

It introduces a method to generate and detect path entanglement of continuous-variable microwaves using a beam splitter and correlation measurements.

Findings

Successful generation of path entanglement in microwave frequencies

Quantification of entanglement via correlation measurements

Potential applications in quantum teleportation and radar

Abstract

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. Our experiments open the avenue to quantum teleportation, quantum communication, or quantum radar with continuous variables at microwave frequencies.