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An important feature of Schwarzschild spacetime is the presence of orbitingnull geodesics and caustics. Their presence implies strong gravitationallensing effects for matter and radiation, i.e., for excitations of quantumfields. Here, we raise the question whether the lensing manifests itself alsoin the vacuum of quantum fields, namely by lensing the distribution of vacuumentanglement. To explore this possibility, we use the method of entanglementharvesting, where initially unentangled localized quantum systems aretemporarily coupled to the field at different locations. We find that for theBoulware, Hartle-Hawking and Unruh vacua in 3+1 dimensional Schwarzschildspacetime, the harvesting of vacuum entanglement is indeed greatly amplifiednear caustics. In particular, we establish that pre-existing vacuumentanglement can be harvested also for lightlike separations.

Lensing of Vacuum Entanglement near Schwarzschild Black Holes