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The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and Autler-Townes splitting effects is investigated theoretically.It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than in the weakcoupling-field regime.In the weak-coupling-field regime,which was recently recognized as the electromagnetically induced transparency regime(Abi-Salloum T Y 2010 Phys.Rev.A 81 053836),the output amplitude noise is affected mainly by the atomic noise originating from the random decay process of atoms.While in the strong-coupling-field regime,defined as the Autler-Townes splitting regime,the output amplitude noise is affected mainly by the phase-toamplitude conversion noise.This is useful in improving the quality of the experiment for efficient quantum memory,and hence has an application in quantum information processing.
The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and Autler-Townes splitting effects is considered theoretically. It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than than in the weak-coupling-field regime. which was recently recognized as the electromagnetically induced transparency regime (Abi-Salloum TY 2010 Phys. Rev. A 81 053836), the output amplitude noise is affected mainly by the atomic noise originating from the random-decay process of atoms. Whilst in a strong-coupling-field regime, defined as the Autler-Townes splitting regime, the output amplitude noise is affected mainly by the phase-to-noise conversion noise. This is useful in improving the quality of the experiment for efficient quantum memory, and has has an application in quantum information processing.