Quantum theory of noise in phase conjugation by four-wave mixing in a two-level system Academic Article uri icon


  • A quantum theory of nearly degenerate backward four-wave mixing in a two-level atomic system is developed. The theory is used to calculate the quantum noise produced by a phase-conjugate mirror based on this system. The results indicate that in the case of pure radiative broadening the ideal quantum-noise limit is reached for relatively small pump-wave strengths and for relatively large probe-pump and pump-resonance detunings, so that the phase-conjugate reflectivity is far from its maximum value. Conversely, in the collisionally broadened case, operation closest to the quantum-noise limit occurs near the point of maximum reflectivity. 1997 The American Physical Society.

published proceedings

  • Physical Review A

altmetric score

  • 3

author list (cited authors)

  • Schirmer, R. W., Lanzerotti, M. Y., Gaeta, A. L., & Agarwal, G. S.

citation count

  • 5

complete list of authors

  • Schirmer, RW||Lanzerotti, MY||Gaeta, AL||Agarwal, GS

publication date

  • April 1997