In the rapidly evolving landscape of modern physics and engineering, the transition from classical to quantum technology represents a paradigm shift of historical significance. While classical sensors have served humanity well for centuries—measuring temperature, pressure, and light with reliable accuracy—we are now approaching the fundamental limits of what classical physics can offer. Enter the realm of .
| Quantum Sensor | Principle | Measurand | Sensitivity (Typical) | | :--- | :--- | :--- | :--- | | | Laser-cooled atoms in superposition | Acceleration, Rotation | ( 10^-10 g ) | | SQUID (Superconducting Quantum Interference Device) | Flux quantization & Josephson junction | Magnetic field | ( 10^-15 T ) | | NV Center in Diamond | Nitrogen-vacancy center spin coherence | Magnetic/Electric field, Temperature | ( \textnT / \sqrt\textHz ) | | Quantum Cascade Detector | Intersubband transitions in quantum wells | Mid-IR/THz radiation | Single-photon level | | Rydberg Atom Electrometer | Highly excited atoms; Stark shift | Electric field (RF/microwave) | ( \mu V / \textcm ) |
Allowing a particle to exist in multiple states simultaneously, making it hyper-sensitive to external perturbations.
When downloading a PDF on this topic, one will inevitably encounter a few core physical principles that serve as the engine for these devices.