The topic of quantum entanglement is at the heart of the disparity between classical and quantum physics because it is a primary feature of quantum mechanics that is not present in classical mechanics. Entanglement occurs when two quantum systems become correlated in such a way that the state of one system is dependent on the state of the other, even when they are separated by a large distance.

In classical mechanics, such correlations between objects are not possible because classical objects have definite properties, such as position and velocity, that can be determined independently of each other. However, in quantum mechanics, the properties of particles are described by wave functions, which can be in a state of superposition, meaning that the particle can exist in multiple states simultaneously. When two particles are entangled, their wave functions become entangled, resulting in a correlation between their states that cannot be explained by classical mechanics.

The concept of entanglement has important implications for quantum computing, cryptography, and communication. For example, entanglement can be used to perform quantum teleportation, which allows information to be transferred instantaneously between two entangled particles, regardless of the distance between them. The ability to perform these types of operations is what makes quantum mechanics so different and powerful compared to classical mechanics.
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