  A strategy is proposed to excite particles from a Fermi sea in a noise-free
fashion by electromagnetic pulses with realistic parameters. We show that by
using quantized pulses of simple form one can suppress the particle-hole pairs
which are created by a generic excitation. The resulting many-body states are
characterized by one or several particles excited above the Fermi surface
accompanied by no disturbance below it. These excitations carry charge which is
integer for noninteracting electron gas and fractional for Luttinger liquid.
The operator algebra describing these excitations is derived, and a method of
their detection which relies on noise measurement is proposed.
