How Does Quantum Entanglement Work?

Quantum entanglement is a system of entangled particles. When you have information of one part of the system, you immediately know what the other parts are like. Information seems to be travelling faster than peed of light - but it's not quite that way. Nicholl: If we keep one particle here and take one back to the past, will quantum entanglement still work? And if yes, can we say that information can travel across time?