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What is Quantum Sensing?
Quantum sensing is a measurement approach that uses quantum properties of matter or light to detect physical quantities with very high sensitivity and precision. By exploiting phenomena such as quantum superposition, interference, or entanglement, quantum sensors can measure quantities including gravity, acceleration, magnetic fields, time, and frequency.
Quantum sensing can provide measurement capabilities beyond those of conventional sensors, particularly for detecting very small variations or changes in physical phenomena. Cold-atom interferometry is one important approach, used in applications such as absolute gravimetry and quantum inertial sensing.
HOW Quantum Sensing Works
Quantum sensing can be understood through three main steps:
Quantum state preparation
Atoms, photons, or other quantum systems are prepared in a controlled quantum state using techniques such as laser cooling, trapping, or optical manipulation.
Interaction with the quantity being measured
The quantum system interacts with the physical phenomenon of interest. This interaction modifies a measurable quantum property, such as phase, energy, or spin.
Quantum measurement
The resulting change is detected and converted into a precise measurement of the physical quantity. Quantum interference can amplify the sensitivity to very small variations.
