  We propose a way to measure the qubit state of an arbitrary sub-ensemble of
atoms in an array without significantly disturbing the quantum information in
the unmeasured atoms. The idea is to first site-selectively transfer atoms out
of the qubit basis so that one of the two states at a time is put into an
auxiliary state. Electromagnetically induced transparency (EIT) light will then
protect most states while detection light is scattered from atoms in the
auxiliary state, which is made immune to the EIT protection by angular momentum
selection rules and carefully chosen light polarization. The two states will be
measured in turn, after which it is possible to recool and return the atoms to
a qubit state. These measurements can be the basis of quantum error correction.
