Perfect Zeno-like effect through imperfect measurements at a finite   frequency
  The quantum Zeno effect is usually thought to require infinitely frequent and perfect projective measurements to freeze the dynamics of quantum states. We show that perfect freezing of quantum states can also be achieved by more realistic non-projective measurements performed at a finite frequency. 
David Layden, Eduardo Martin-Martinez and Achim Kempf
quant-ph math-ph math.MP