Raman scheme for adjustable bandwidth quantum memory (2009)
Gouet, J. -L. Le, Berman, P. R.
We propose a scenario of quantum memory for light based on Raman scattering. The storage medium is a vapor and the different spectral components of the incoming signal are stored in different atomic...
Xu, Xiaodong, Sun, Bo, Kim, Erik D., Smirl, Katherine, Berman, P. R., Steel, D. G., ...
We investigate a singly-charged quantum dot under a strong optical driving field by probing the system with a weak optical field. When the driving field is detuned from the trion transition, the...
One-Dimensional Laser Cooling Below the Doppler Limit (2007)
Finkelstein, V., Guo, J., Berman, P. R.
A theoretical analysis is given for one-dimensional laser cooling below the Doppler limit of J = 1/2 ground-state atoms. The laser field consists of a pair of counterpropagating, linearly polarized,...
Recoil-Induced Resonances in Pump-Probe Spectroscopy Including Effects of Level Degeneracy (2007)
Theoretical calculations are presented for the probe absorption spectra of atoms having magnetically degenerate ground states which are subjected to weak pump fields that produce spatial polarization...
Grating Stimulated Echo (2007)
Dubetsky, B., Berman, P. R., Sleator, T.
A theory of a grating stimulated echo (GSE) is developed. The GSE involves the sequential excitation of atoms by two counterpropagating traveling waves, a standing wave, and a third traveling wave....
RESONANT ENHANCEMENT OF STATE-MIXING AND IONIZING COLLISIONS IN COLD RYDBERG-ATOM GASES (2007)
Reinhard, A., Liebisch, T. Cubel, Berman, P. R., Raithel, G.
Author Institution: FOCUS Center $\&$ Michigan Center for Theoretical Physics,; Department of Physics, University of Michigan, Ann Arbor, MI; 48109
Quantum computing with magnetic atoms in optical lattices of reduced periodicity (2006)
Ravaine, Boris, Derevianko, Andrei, Berman, P. R.
We investigate the feasibility of combining Raman optical lattices with a quantum computing architecture based on lattice-confined magnetically interacting neutral atoms. A particular advantage of...
Microscopic Theory of the Photon Recoil of an Atom in a Dielectric (2006)
An atom recoils when it undergoes spontaneous decay. In this paper we present a microscopic calculation of the recoil of a source atom imbedded in a dielectric medium. We find that the source atom...
Cooling in reduced period optical lattices: non-zero Raman detuning (2006)
Malinovsky, V. S., Berman, P. R.
In a previous paper [Phys. Rev. A 72, 033415 (2005)], it was shown that sub-Doppler cooling occurs in a standing-wave Raman scheme (SWRS) that can lead to reduced period optical lattices. These...
Atomic entanglement generation with reduced decoherence via four-wave mixing (2006)
In most proposals for the generation of entanglement in large ensembles of atoms via projective measurements, the interaction with the vacuum is responsible for both the generation of the signal that...
Cooperative spin decoherence and population transfer (2006)
An ensemble of multilevel atoms is a good candidate for a quantum information storage device. The information is encrypted in the collective ground state atomic coherence, which, in the absence of...
Microscopic Theory of Spontaneous Decay in a Dielectric (2005)
The local field correction to the spontanous dacay rate of an impurity source atom imbedded in a disordered dielectric is calculated to second order in the dielectric density. The result is found to...
Dutt, M. V. Gurudev, Cheng, Jun, Li, Bo, Xu, Xiaodong, Li, Xiaoqin, Berman, P. R., ...
We report on the coherent optical excitation of electron spin polarization in the ground state of charged GaAs quantum dots via an intermediate charged exciton (trion) state. Coherent optical fields...
Malinovskaya, S. A., Bucksbaum, P. H., Berman, P. R.
The coherence of two, coupled two-level systems, representing vibrational modes in a semiclassical model, is calculated in weak and strong fields for various coupling schemes and for different...
EIT-assisted atomic squeezing (2003)
Dantan, A., Pinard, M., Berman, P. R.
The interaction of classical and quantized electromagnetic fields with an ensemble of atoms in an optical cavity is considered. Four fields drive a double- level scheme in the atoms, consisting of a...
Is negative refraction, perfect focusing compatible with quantum mechanics? (2003)
In light of experiments in atom optics, the compatibilty of negative refraction, perfect focusing with quantum mechanics is brought into question.
Spin squeezing via atom - cavity field coupling (2003)
Genes, Claudiu, Berman, P. R., Rojo, A. G.
Spin squeezing via atom-field interactions is considered within the context of the Tavis-Cummings model. An ensemble of N two-level atoms interacts with a quantized cavity field. For all the atoms...
Theory of selective excitation in Stimulated Raman Scattering (2003)
Malinovskaya, S. A., Bucksbaum, P. H., Berman, P. R.
A semiclassical model is used to investigate the possibility of selectively exciting one of two closely spaced, uncoupled Raman transitions. The duration of the intense pump pulse that creates the...
Autler-Townes spectroscopy of the $5S_{1/2}-5P_{3/2}-44D$ cascade of cold $^{85}$Rb atoms (2003)
Teo, B. K., Feldbaum, D., Cubel, T., Guest, J. R., Berman, P. R., Raithel, G.
We study nonlinear optical effects in the laser excitation of Rydberg states. $5S_{1/2}$ and $5P_{3/2}$ levels of $^{85}$Rb are strongly coupled by a strong laser field and probed by a weak laser...
Atom spin squeezing in a double lambda system (2003)
Dantan, A., Pinard, M., Berman, P. R.
The interaction of classical and quantized electromagnetic fields with an ensemble of atoms in an optical cavity is considered. Four fields drive a double-lambda level scheme in the atoms, consisting...
Atomic squeezing in a Lambda system (2002)
Dantan, A., Pinard, M., Josse, V., Nayak, N., Berman, P. R.
Using a quantum theory for an ensemble of three-level atoms (lambda) placed in an optical cavity abd driven by electromagnetic fields, we show that the long-lived spin associated with the ground...
$\frac{\lambda}{8}$-period optical potentials (2002)
A Raman configuration of counterpropagating traveling wave fields, one of which is $lin\bot lin$ polarized and the other $lin\Vert lin$ polarized, is shown to lead to optical potentials having...
$\lambda /4$, $\lambda /8$, and higher order atom gratings via Raman transitions (2002)
A method is proposed for producing atom gratings having period $\lambda /4$ and $\lambda /8$ using optical fields having wavelength $\lambda $. Counterpropagating optical fields drive Raman...
Contents: Collisional studies using laser spectroscopy; The nature and validity of collision kernels; Strong field effects in laser spectroscopy; Optical collisions including a model potential...
Theory of Saturation Spectroscopy Including Collisional Effects, (2002)
Berman ,P. R., Liao ,P. F., Bjorkholm,J. E.
A theory of saturation spectroscopy in three-level gas vapor systems, including collisional effects, is presented. Using a model of collisions in which they are phase-interrupting in their effect on...
Berman ,P. R., Liao ,P. F., Bjorkholm,J. E.
We report studies of collision-induced features of the 3S(1/2) yields 3P(1/2) yields 4D(3/2) two-photon absorption in atomic sodium vapor undergoing collisionss with several rare gas perturbers. The...
Berman ,P. R., Liao ,P. F., Bjorkholm,J. E.
We report the results of an experimental study of the effects of velocity-changing collisions on two-photon and stepwise absorption lineshapes. Excitation spectra for the 3S(1/2) yields 3P(1/2)...
Collisionally Aided Radiative Excitation in a three-level atomic system is investigated using a stationary phase method for the case of large atom-field detunings and weak incident fields. It is...
Photon Echoes in Standing Wave Fields: Time Separation of Spatial Harmonics, (2002)
A calculation is presented to describe the response of an atomic system subjected to two strong standing wave field pulses separated in time. One finds a sequence of output pulses following the input...
Line Shapes in Laser Experiments. (2002)
A brief review of recent developments in line shape studies using laser spectroscopy is presented. Experiments are discussed in which the absorption or emission line profiles associated with various...
Berman,P. R., Liao,P. F., Bjorkholm,J. E.
This document reports on a theoretical and experimental study of the influence of collisions on the saturation spectroscopy line shapes associated with three-level gas vapor systems. The study is...
Photon Echoes Using Double-Resonance Optical Pulses, (2002)
A theory of photon echoes using double resonance optical pulses(PEDROP) is presented. Two double resonance pulses, separated by a time interval T, are used to cause transitions among three states of...
Lu,Ning, Berman,P. R., Yodh,A. G., Bai,Y. S., Mossberg,T. W.
The transient probe spectra is analyzed that arise when a three level atom is strongly driven by an optical field nearly resonant with one transition and is probed by a step-function weak field on a...
Atom gratings produced by large angle atom beam splitters (2001)
An asymptotic theory of atom scattering by large amplitude periodic potentials is developed in the Raman-Nath approximation. The atom grating profile arising after scattering is evaluated in the...
Spectrum of light scattering from an extended atomic wave packet (2001)
The spectrum of the light scattered from an extended atomic wave packet is calculated. For a wave packet consisting of two spatially separated peaks moving on parallel trajectories, the spectrum...
Manipulating the Speed of Sound in a Two-Component Bose-Einstein Condensate (2000)
We consider a two-component weakly interacting Bose-Einstein condensate in the presence of an external field which couples the two components. We express the Hamiltonian in terms of the energy...
Ground State and Quasiparticle Spectrum of a Two Component Bose-Einstein Condensate (2000)
Search, C. P., Rojo, A. G., Berman, P. R.
We consider a dilute atomic Bose-Einstein condensate with two non-degenerate internal energy levels. The presence of an external radiation field can result in new ground states for the condensate...
Recoil-Induced-Resonances in Nonlinear, Ground-State, Pump-Probe Spectroscopy (2000)
A theory of pump-probe spectroscopy is developed in which optical fields drive two-photon Raman transitions between ground states of an ensemble of three-level $\Lambda $ atoms. Effects related to...
Atom Interference using microfabricated structures (2000)
Atom density profile arising in the atomic beam after passing through the one or two microfabricated structures (MS) is considered. Two limiting cases the beam with large and small angular divergence...
Nonlinear, ground-state, pump-probe spectroscopy (2000)
A theory of pump-probe spectroscopy is developed in which optical fields drive two-quantum, Raman-like transitions between ground state sublevels. Three fields are incident on an ensemble of atoms....
Suppression of Magnetic State Decoherence Using Ultrafast Optical Pulses (2000)
It is shown that the magnetic state decoherence produced by collisions in a thermal vapor can be suppressed by the application of a train of ultrafast optical pulses.
Cohen, J. L., Dubetsky, B., Berman, P. R., Schmiedmayer, J.
We propose a scheme to create high-contrast, periodic atom density distributions having period $\lambda /2n$ using the Talbot effect, where $% \lambda $ is the wave length of the optical fields that...
Atom focusing by far-detuned and resonant standing wave fields: Thin lens regime (1999)
Cohen, J. L., Dubetsky, B., Berman, P. R.
The focusing of atoms interacting with both far-detuned and resonant standing wave fields in the thin lens regime is considered. The thin lens approximation is discussed quantitatively from a quantum...
Talbot Oscillations and Periodic Focusing in a One-Dimensional Condensate (1999)
Rojo, A. G., Cohen, J. L., Berman, P. R.
An exact theory for the density of a one-dimensional Bose-Einstein condensate with hard core particle interactions is developed in second quantization and applied to the scattering of the condensate...
Collision Kernels and Laser Spectroscopy, (1998)
Berman,P. R., Mossberg,T. W., Hartmann,S. R.
Pub. in Physical Review A, v25 n5 p2550-2571 May 82.
New Results for Transition Probabilities in Two-Level Systems: The Large Detuning Regime, (1998)
The problem of calculating transition probabilities in two-level systems is studied in the limit where the detuning is large compared to the inverse duration of the interaction. Within each family,...
Work is summarized in areas of: Laser Assisted Collisions; Velocity Changing collisions in Atomic Vapors; Coherent Transients; Collision Induced Extra Resonances; Breakdown of the Optical Bloch...
Work is reported in areas of: 1) Laser spectroscopic line shapes; 2) Coherent transients including collisional effects; 3) Laser assisted collisions; 4) Collision-induced resonant structures in laser...
Three-State Model for Laser-Assisted Collisions, (1998)
A laser assisted collision (LAC) is one involving a combined collisional-radiative interaction. A typical laser assisted collision can be written as a reaction of the form. A sub I + h-bar omega...
Theory and Interpretation of Pressure-Induced Resonances, (1998)
Both a bare-atom and dressed-atom picture of atom-field interactions are used to present a theory of the pressure-induced resonances that can arise when four radiation fields interact with a three...
(1) Quantum jumps; (2) Coherent transients; (3) laser- assisted collisions; (4) Collision induced resonant structures in laser spectroscopy; (5) Collision kernels and transport coefficients; (6)...
Pressure-Induced Effects in Two-Level Atoms: New Approach and Simple Physical Interpretation, (1998)
Pressure-induced effects in nonlinear optics and spectroscopy are studied using a nonstandard-dressed-atom formalism for a set of two-level atoms. Consider a two-level atom interacting with two...
Theoretical Studies Relating to the Interaction of Radiation with Matter. (1998)
Contents: Coherent Transients; Collision-Induced Resonant Structures in Laser Spectroscopy; Interactions with Broadband Noise; Laser Cooling Below the Doppler Limit. Keywords: Laser spectroscopy,...
Theoretical Studies Relating to the Interaction of Radiation with Matter. (1998)
Contents: Coherent transients, Laser spectroscopy, Pressure induced resonances, Laser assisted collisions, Quantum jumps, Interaction of atoms with broad band width radiation, Exchange collision...
Theoretical Studies Relating to the Interaction of Radiation With Matter. (1998)
During the past year, progress has been made in the areas of: (1) Coherent transients using counterpropagating fields; (2) New resonances in cold-atom spectroscopy; (3) Laser cooling in one dimension...
Theoretical Studies Relating to the Interaction of Radiation with Matter. (1998)
The final report for Grant No. N00014-91-J7-1146 is divided into seven subject areas as follows: (1) Coherent transients using broadband optical pulses; (2) Four-wave mixing in magnetically...
Recoil-Induced-Resonances in Nonlinear, Ground-State, Pump-Probe Spectroscopy (1998)
A theory of pump-probe spectroscopy is developed in which optical fields drive two-photon Raman transitions between ground states of an ensemble of three-level atoms. Effects related to the recoil...
Quasiperiodic Atom Optics, Focusing, and Wave packet Rephasing (1998)
Cohen, J. L., Dubetsky, B., Berman, P. R.
We propose a laser field configuration which acts as a quasiperiodic atom optical diffraction grating. Analytical and computational results for the atomic center-of-mass wavefunction after the...
Matter wave interference using two-level atoms and resonant optical fields (1998)
A theory of matter wave interference is developed in which resonant optical fields interact with two-level atoms. When recoil effects are included, spatial modulation of the atomic density can occur...
An analysis of dynamical suppression of spontaneous emission (1998)
It has been shown recently [see, for example, S.-Y. Zhu and M. O. Scully, Phys. Rev. Lett. {\bf 76}, 388 (1996)] that a dynamical suppression of spontaneous emission can occur in a three-level system...
Comparison of Recoil-Induced Resonances (RIR) and Collective Atomic Recoil Laser (CARL) (1998)
The theories of recoil-induced resonances (RIR) [J. Guo, P. R. Berman, B. Dubetsky and G. Grynberg, Phys. Rev. A {\bf 46}, 1426 (1992)] and the collective atomic recoil laser (CARL) [ R. Bonifacio...
High resolution amplitude and phase gratings in atom optics (1998)
Berman, P. R., Dubetsky, B., Cohen, J. L.
An atom-field geometry is chosen in which an atomic beam traverses a field interaction zone consisting of three fields, one having frequency $\Omega =c/\lambda $ propagating in the $\hat{z}$...
The interaction of atoms with ultrafast, counterpropagating optical fields is considered. The magnetic degeneracy and hyperfine splitting of the atomic levels are included in the calculations, which...
Persistence of velocity following elastic collisions (1978)
Bréchignac, C., Vetter, R., Berman, P.R.
Elastic Kr*-He collisions have been studied using a two laser saturated-absorption experiment on the λ = 557 nm line of KrI. With the pump laser detuned from the atomic resonance, one can follow...
Persistence of velocity following elastic collisions (1978)
Bréchignac, C., Vetter, R., Berman, P.R.
Elastic Kr*-He collisions have been studied using a two laser saturated-absorption experiment on the λ = 557 nm line of KrI. With the pump laser detuned from the atomic resonance, one can follow...
Persistence of velocity following elastic collisions (1978)
Bréchignac, C., Vetter, R., Berman, P.R.
Elastic Kr*-He collisions have been studied using a two laser saturated-absorption experiment on the λ = 557 nm line of KrI. With the pump laser detuned from the atomic resonance, one can follow...
Mechanism of Excitation of Aplysia Neurons by Carbon Dioxide
The abdominal ganglion of Aplysia californica was perfused with artificial seawater equilibrated at different PCOCO2's and pH's for 5 min or less. 5% CO2 dropped perfusate pH from 8.0 to 6.5 and...