  We investigate the emergent time scenario in quantum cosmology based on the
Page-Wotters approach. Using a quantum cosmological model with a qubit clock,
it is demonstrated how the entanglement between the qubit clock and the
geometry derives emergence of a time parameter which defines evolution of the
timeless quantum state of the universe. We show the universe wave function
conditioned by a qubit clock obeys the standard Schr\"{o}dinger equation and
the Fisher information for the clock state, which quantifies entanglement
between the universe and the clock, contributes as a negative energy density.
