Decoherence

[Ignat]

We have considered two fantastic concepts of quantum physics: superposition and entanglement. And here is the third concept – decoherence. Decoherence is the process by which a quantum system loses its quantum coherence, that is, the ability to be in a superposition of states. Decoherence is one of the main problems in quantum computing and quantum information, as it destroys the quantum states and entanglements necessary to perform quantum algorithms and operations. Quantum systems inevitably interact with the environment, which leads to a loss of coherence. These interactions can include thermal fluctuations, electromagnetic radiation, and other external disturbances. Decoherence destroys entangled states, making it impossible to execute many quantum algorithms and protocols such as quantum teleportation and quantum cryptography. Decoherence causes errors in quantum computing, which reduces the accuracy and reliability of quantum algorithms. Thus, as soon as we return from the dream world, where a wave turns into a photon particle, and an electron particle turns into a wave, to the real world, evil decoherence immediately destroys the fantasies of quantum physicists. And it becomes clear that a quantum computer will not be built as long as there is superposition and entanglement in the brains of modern physicists. It's time to get back to the real world and start doing science, not science fiction.