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What is Quantum Coherence?
Quantum Coherence describes the preservation of a well-defined phase relationship between different quantum states in a quantum system. It is a fundamental property that enables quantum phenomena such as interference, superposition, and entanglement.
Maintaining quantum coherence is essential for high-precision quantum sensing, atom interferometry, quantum communication, and quantum computing, as interactions with the environment can cause coherence to decay.
HOW Quantum Coherence Works
Quantum coherence occurs when a quantum system maintains a stable phase relationship between its possible states, allowing their probability amplitudes to interfere. The degree of coherence determines how clearly quantum interference effects can be observed.
Quantum state preparation
Atoms, ions, photons, or other quantum systems are prepared in a controlled superposition of quantum states.
Phase evolution
The different components of the quantum state evolve with a relative phase that depends on the system's energy levels and interactions with its environment.
Coherence preservation
Environmental disturbances such as collisions, electromagnetic fields, temperature fluctuations, or laser noise can disrupt the phase relationship. Reducing these disturbances helps preserve coherence and maintain measurable quantum interference.
