The term "Quantum Realm" is primarily associated with the Marvel Cinematic Universe (MCU) rather than being a concept from scientific or quantum physics. In the MCU, the Quantum Realm is portrayed as a microscopic dimension with strange and surreal properties. However, it's important to note that the depiction of the Quantum Realm in the movies is fictional and not based on real scientific understanding.
In the context of actual quantum physics, the term "quantum realm" is not commonly used. Quantum physics deals with the behavior of matter and energy at very small scales, where the principles of quantum mechanics govern their interactions. Quantum mechanics describes phenomena such as superposition (where particles can exist in multiple states simultaneously) and entanglement (where the properties of particles can be correlated regardless of distance).
At the quantum scale, the behavior of particles can be quite different from what we experience in our everyday macroscopic world. However, there is no specific "realm" or alternate dimension associated with quantum physics that we currently know of or have evidence for.
It's important to distinguish between the scientific understanding of quantum physics, which is a well-established and extensively studied field, and the fictional depictions of the Quantum Realm in popular culture. The concept of the Quantum Realm in the MCU is purely a creation for storytelling purposes and should not be confused with the scientific understanding of quantum mechanics.