The long-range spatial and temporal ordering displayed by discrete time crystals, can become advantageous properties when used for sensing extremely weak signals. Here, we investigate their performance as quantum sensors of weak ac fields and demonstrate, using the quantum Fisher information measure, that they can overcome the shot-noise limit while allowing long interrogation times. In such systems, collective interactions stabilize their dynamics against noise, making them robust enough to protocol imperfections.

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• Many-body localization
• Quantum Fisher information
• Quantum metrology
• Time crystals
• AC susceptibility measurements
• Exact diagonalization
• Linear response theory