# Entanglement and separable state

1. Feb 4, 2014

### phyky

Entanglement is inseparable state |ψ>=$\Sigma$$\Sigma$c(n1,n2)|n1n2> but for decoherence where system and environment coupling |ψ>(s,e)=$\Sigma$c|s>$\otimes$|e> which is normal tensor product, can we still say entanglement cause decoherece or just the tensor product between system and environment?

2. Feb 4, 2014

### atyy

Yes, entanglement is responsible for decoherence.