Finite-time quantum entanglement in propagating squeezed microwaves

Understand

Two-mode squeezing is a fascinating example of quantum entanglement manifested in cross-correlations of incompatible observables between two subsystems.

• At the same time, these subsystems themselves may contain no quantum signatures in their self-correlations.
• These properties make two-mode squeezed (TMS) states an ideal resource for applications in quantum communication.
• Here, we generate propagating microwave TMS states by a beam splitter distributing single mode squeezing emitted from distinct Josephson parametric amplifiers along two output paths.