No, entanglement in quantum mechanics does not spontaneously change into a non-entangled state without any external influence or intervention. Once particles become entangled, their states are correlated in a way that cannot be described by individual states for each particle alone. This correlation persists until an external interaction or measurement is made.
Entanglement is a fundamental feature of quantum mechanics, where the state of a composite system cannot be described as a simple combination of states for individual components. Instead, the entangled state encompasses the joint properties of the system as a whole.
When measurements or interactions are performed on entangled particles, the entanglement may be "broken" or reduced. For example, if a measurement is made on one entangled particle, it can "collapse" the entangled state, leading to a non-entangled or separable state for the measured particle and affecting the entanglement with the other particle.
However, it's important to note that entanglement itself does not spontaneously disappear or change into a non-entangled state without any external intervention. The entangled state remains until an interaction or measurement causes a change in the system.
Entanglement is a fascinating and crucial aspect of quantum mechanics, and it plays a significant role in various phenomena, including quantum information processing, quantum teleportation, and quantum cryptography.