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Quantum Electronics and Laser Science Conference

Vacuum-squeezed Solids: Two-phonon Coherent States In KtaO/sub3/

Gregory A. Garrett, Roberto D. Merlin, Alberto G. Rojo, Anil K. Sood, J.F. Whitaker

Published Jan 1, 1997• 0 citations
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Summary form only given. The investigation of coherent phonons has been a field of extensive efforts since the first observation of coherent phonons in 1990. Several excitation mechanisms for coherent phonons in solids have been identified among which the most prominent is impulsive stimulated first order Raman scattering. Coherent states exhibit an oscillating expectation value of the phonon amplitude of a given mode while the statistic properties like amplitude variances and covariances remain static. However, dynamics of these statistic variables can be driven by second-order Raman-scattering (SOR), e.g., oscillating amplitude variances (phonon squeezed states) as first reported by Garret et al. Here we report-to our knowledge for the first time-on correlated states of phonon-mode-pairs consisting of different phonons driven by ultrashort light pulses. KTaO/sub 3/, is the ideal material for this study since first order Raman processes are not allowed.

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Squeezing of Phonon Fields Induced by Coherence of Internal States of Trapped Ions

Zeng Hao-Sheng

While the frequency of classical driving filed is resonant to the redside band of center-of-mass mode and without Lamb-Dicke limit,the dynamics of the internal states of two trapped ions coupled to their phonon filed can be described by a nonlinear Jaynes-Cummings model.When the internal state of trapped ions is initially in a non-coherent mixed state and the phonon field in a vacuum state,the evolved state of the phonon field does not appear squeezing;However,when the internal state is initially in a coherent superposition pure state and the phonon field in a vacuum state,the evolved state of the phonon field shows squeezing.Under proper initial conditions,the squeezing is persistent and periodic in time.

Hu'nan Shifan Daxue xuebao. Ziran kexue ban•Jan 1, 2007•0 citations
Summary form only given. The investigation of coherent phonons has been a field of extensive efforts since the first observation of coherent phonons in 1990. Several excitation mechanisms for coherent phonons in solids have been identified among which the most prominent is impulsive stimulated first order Raman scattering. Coherent states exhibit an oscillating expectation value of the phonon amplitude of a given mode while the statistic properties like amplitude variances and covariances remain static. However, dynamics of these statistic variables can be driven by second-order Raman-scattering (SOR), e.g., oscillating amplitude variances (phonon squeezed states) as first reported by Garret et al. Here we report-to our knowledge for the first time-on correlated states of phonon-mode-pairs consisting of different phonons driven by ultrashort light pulses. KTaO/sub 3/, is the ideal material for this study since first order Raman processes are not allowed.
While the frequency of classical driving filed is resonant to the redside band of center-of-mass mode and without Lamb-Dicke limit,the dynamics of the internal states of two trapped ions coupled to their phonon filed can be described by a nonlinear Jaynes-Cummings model.When the internal state of trapped ions is initially in a non-coherent mixed state and the phonon field in a vacuum state,the evolved state of the phonon field does not appear squeezing;However,when the internal state is initially in a coherent superposition pure state and the phonon field in a vacuum state,the evolved state of the phonon field shows squeezing.Under proper initial conditions,the squeezing is persistent and periodic in time.