Quantum control with quantum Zeno effects

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As a new method of quantum control, we proposed the use of the quantum Zeno effects and the anti Zeno effects. In these effects one can manipulate the motion of quantum systems with non-unitary processes such as observation and relaxation. In spite of the non-unitarity, the probability is conserved. The destruction of the coherence or the decoherence plays a crucial role. We can even create the coherence using the Zeno effect. As a testing system, we used the optical pumping system which has been conveniently utilized in quantum optical experiments. We found that in this familiar system the Zeno effect plays a very important role. It turned out that in the strong pumping limit the atomic polarization is maintained against the horizontal magnetic field owing to the Zeno effect rather than the population transfer via optical pumping. The Zeno effect induced by the optical pumping decoherence inhibits the Zeeman transition. It is verified experimentally that the light absorption decreases asymptotically to zero as the incident light intensity, increased.