How cold-atom interferometers, atomic clocks, and quantum magnetometers deliver position, navigation, and timing when GPS is jammed or spoofed.
Position, navigation, and timing underpins military and civil operations, and satellite navigation is its single point of failure. Quantum PNT replaces the external signal with self-contained references: cold-atom interferometers measuring acceleration and rotation, atomic clocks holding time through long GNSS outages, and quantum magnetometers enabling magnetic-anomaly navigation against a mapped field. This guide covers GNSS denial modes including jamming and spoofing, the four-part quantum PNT stack, defense applications across air, sea, and undersea platforms, and where each technology actually stands on readiness today.