Quantum entanglement is a phenomenon in which two or more particles become connected in such a way that the state of one particle affects the state of the other, even when they are separated by large distances.
Quantum entanglement can be measured by observing the correlations between the measurements of the entangled particles. These correlations can be quantified using mathematical tools such as Bell's inequality.
Yes, quantum entanglement can be used for communication, but it cannot be used to transmit information faster than the speed of light. This is because the measurement of entangled particles is random and unpredictable, making it impossible to use for transmitting a message.
Entanglement can be retained by isolating the entangled particles from the external environment. This can be achieved by using advanced technologies such as quantum computers and quantum networks, which can maintain the delicate entangled states for longer periods of time.
Quantum entanglement has numerous potential applications such as quantum cryptography, quantum teleportation, and quantum computing. It also has implications for understanding the fundamental laws of physics and could potentially lead to new technologies in the future.