  We propose a holographic correspondence of the flat spacetime based on the
behavior of the entanglement entropy and the correlation functions. The
holographic dual theory turns out to be highly non-local. We argue that after
most part of the space is traced out, the reduced density matrix gives the
maximal entropy and the correlation functions become trivial. We present a toy
model for this holographic dual using a non-local scalar field theory that
reproduces the same property of the entanglement entropy. Our conjecture is
consistent with the entropy of Schwarzschild black holes in asymptotically flat
spacetimes.
