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Quantum Optics Group
Norman Bridge Laboratory of Physics
California Institute of Technology
Our group has extensively studied both theoretically as well as experimentally the subject of Quantum Interference (QI) in multiphoton atomic processes as well as its possible applications to frequency metrology and other commercial applications. The origin of quantum interference in multiphoton excitations in the presence of multiple lasers arises due to the presence of multiple excitation pathways, the amplitudes of which coherently interfere to result in a fringe pattern of the excited state population (see logo cartoon above). Viewed in a different way, the atom behaves as a quantum nonlinear mixer (QNM) with demodulation capabilities that extend to 100's of THz.
Our results are discussed in several papers, QNM is pending a patent, a computerized search algorithm for optimizing a particular experimental realization has been developed and an interactive quantum interference calculator (QuInC) based on our theory has been implemented and presented here.
Quantum
Interference Calculator:, QuInC 
(click
on me)
Frequency
Metrology: MetQuIn
(click
on me)
Patent:
U.S. Patent Application S/N 08/799,169
Related
Papers:
Frequency
Metrology by use of Quantum Interference, N.
Ph. Georgiades, E. S. Polzik and H. J. Kimble, Opt.
Lett. 21, 1688, (1996). (Abstract)Atoms
as Nonlinear Mixers for Detection of Quantum Correlations at Ultrahigh
Frequencies, N. Ph. Georgiades, E. S. Polzik
and H. J. Kimble, Phys. Rev. A, 55,
1605, (1997).(Abstract)
Quantum
Interference in Two-Photon Excitation with Squeezed and Coherent Fields, N.
Ph. Georgiades, E. S. Polzik and H. J. Kimble, Phys. Rev. A, 59, 676 (1999).(Abstract)