# QUASAR paper reports hybrid quantum classifier for satellite signal authentication

_Friday, August 21, 2026 at 12:00 AM EDT · Security, Science · Latest · Tier 2 — Notable_

Researchers describe QUASAR, a quantum-classical neural-network architecture for physical-layer authentication of X-band synthetic-aperture-radar satellite signals. The system combines a CNN spectrogram encoder with a variational quantum circuit to distinguish hardware signal characteristics. In tests against replay, crafted-IQ injection and space-borne spoofing, the paper reports rejecting spoofed transmissions in 89.7%, 94.1% and 81.3% of attempts, respectively. The authors also report that it matched classical-baseline accuracy with 10% of their training data.

## Sources

- [cs.AI updates on arXiv.org](https://arxiv.org/abs/2608.20240)

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