Control of Four-Level Quantum Coherence via Discrete Spectral Shaping of an Optical Frequency Comb

Details Control of Four-Level Quantum Coherence via Discrete Spectral Shaping of an Optical Frequency Comb Control of Four-Level Quantum Coherence via Discrete Spectral Shaping of an Optical Frequency Comb

2008-01-30

arxiv.org/abs/0801.4796v1

Phys. Rev. Lett. 100, 203001 (2008)

Physics

Quantum Physics

5 pages, 4 figures Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.203001

We present an experiment demonstrating high-resolution coherent control of a four-level atomic system in a closed (diamond) type configuration. A femtosecond frequency comb is used to establish phase coherence between a pair of two-photon transitions in cold Rb atoms. By controlling the spectral phase of the frequency comb we demonstrate the optical phase sensitive response of the diamond system. The high-resolution state selectivity of the comb is used to demonstrate the importance of the signs of dipole moment matrix elements in this type of closed-loop excitation. Finally, the pulse shape is optimized resulting in a 256% increase in the two-photon transition rate by forcing constructive interference between the mode pairs detuned from an intermediate resonance.

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