  Multidimensional optical signals are commonly recorded by varying the delays
between time ordered pulses. These control the evolution of the density matrix
and are described by ladder diagrams. We propose a new non-time-ordered
protocol based on following the time evolution of the wavefunction and
described by loop diagrams. The time variables in this protocol allow to
observe different types of resonances and reveal information about intraband
dephasing not readily available by time ordered techniques. The time variables
involved in this protocol become coupled when using entangled light, which
provides high selectivity and background free measurement of the various
resonances. Entangled light can resolve certain states even when strong
background due to fast dephasing suppresses the resonant features when probed
by classical light.
