Browsing OSU - Faculty and Staff Publications by Author "Agarwal, G. S."
Now showing items 1-20 of 38
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Class of solitary wave solutions of the one-dimensional Gross-Pitaevskii equation
Atre, Rajneesh; Panigrahi, Prasanta K.; Agarwal, G. S. (American Physical Society, 2006-05-19)We present a large family of exact solitary wave solutions of the one-dimensional Gross-Pitaevskii equation, with time-varying scattering length and gain or loss, in both expulsive and regular parabolic confinement regimes. ... -
Competition between electromagnetically induced transparency and Raman processes
Agarwal, G. S.; Dey, T. N.; Gauthier, Daniel J. (American Physical Society, 2006-10-05)We present a theoretical formulation of the competition between electromagnetically induced transparency (EIT) and Raman processes. The latter become important when the medium can no longer be considered to be dilute. ... -
dc-field-induced enhancement and inhibition of spontaneous emission in a cavity
Agarwal, G. S.; Pathak, P. K. (American Physical Society, 2004-08-20)We demonstrate how spontaneous emission in a cavity can be controlled by the application of a dc field. The method is specially suitable for Rydberg atoms. We present a simple argument based on Stark shifts for the control ... -
Electromagnetic field induced modification of branching ratios for emission in structured vacuum
Das, Sumanta; Agarwal, G. S. (IOP Publishing, 2008-01-17)We report a fundamental effect of the electromagnetic field induced modification of the branching ratios for emission into several final states. The modifications are especially significant if the vacuum into which the ... -
Entanglement by linear SU(2) transformations: Generation and evolution of quantum vortex states
Agarwal, G. S.; Banerji, J. (IOP Publishing, 2006-07-31)We consider the evolution of a two-mode system of bosons under the action of a Hamiltonian that generates linear SU(2) transformations. The Hamiltonian is generic in that it represents a host of entanglement mechanisms, ... -
Entanglement of two distant Bose-Einstein condensates by detection of Bragg-scattered photons
Deb, B.; Agarwal, G. S. (American Physical Society, 2008-07-31)We show that it is possible to generate entanglement between two distant Bose-Einstein condensates by detection of Hanbury-Brown-Twiss-type correlations in photons Bragg scattered by the condensates. Upon coincident detection ... -
Entangling pairs of nano-cantilevers, Cooper-pair boxes and mesoscopic teleportation
Bose, S.; Agarwal, G. S. (IOP Publishing, 2006-03-07)We propose two schemes to establish entanglement between two mesoscopic quantum systems through a third mesoscopic quantum system. The first scheme entangles two nano-mechanical oscillators in a non-Gaussian entangled state ... -
Fast light solitons in resonant media
Agarwal, G. S.; Dey, T. N. (American Physical Society, 2007-04-05)Using the structure of the Maxwell-Schrodinger equations in two-level systems in the transient domain, we derive both single-soliton and multisoliton (2n pi pulse) solutions associated with fast light in resonant media. ... -
Generation of a superposition of multiple mesoscopic states of radiation in a resonant cavity
Pathak, P. K.; Agarwal, G. S. (American Physical Society, 2005-04-27)Using resonant interaction between atoms and the field in a high quality cavity, we show how to generate a superposition of many mesoscopic states of the field. We study the quasi-probability distributions and demonstrate ... -
Implementing Deutsch-Jozsa algorithm using light shifts and atomic ensembles
Dasgupta, Shubhrangshu; Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2005-01-27)We present an optical scheme to implement the Deutsch-Jozsa algorithm using ac Stark shifts. The scheme uses an atomic ensemble consisting of four-level atoms interacting dispersively with a field. This leads to a Hamiltonian ... -
Inseparability inequalities for higher order moments for bipartite systems
Agarwal, G. S.; Biswas, Asoka (IOP Publishing, 2005-10-07)There are several examples of bipartite entangled states of continuous variables for which the existing criteria for entanglement using the inequalities involving the second-order moments are insufficient. We derive new ... -
Interferences in parametric interactions driven by quantized fields
Agarwal, G. S. (American Physical Society, 2006-07-11)We report interferences in the quantum fluctuations of the output of a parametric amplifier when the cavity is driven by a quantized field at the signal frequency. The interferences depend on the phase fluctuations of the ... -
Langevin analysis of fundamental noise limits in coherent anti-Stokes Raman spectroscopy
Das, Kunal K.; Agarwal, G. S.; Golubev, Yu. M.; Scully, M. O. (American Physical Society, 2005-01-04)We use a Langevin approach to analyze the quantum noise in coherent anti-Stokes Raman spectroscopy in several experimental scenarios: with continuous-wave input fields acting simultaneously and with fast sequential pulsed ... -
Large enhancement of Forster resonance energy transfer on graphene platforms
Biehs, S.-A.; Agarwal, G. S. (AIP Publishing, 2013-12-12)In view of the applications of Forster resonant energy transfer (FRET) in biological systems which especially require FRET in the infrared region, we investigate the great advantage of graphene plasmonics in such studies. ... -
Large two-atom two-photon vacuum Rabi oscillations in a high-quality cavity
Pathak, P. K.; Agarwal, G. S. (American Physical Society, 2004-10-11)We predict a large cooperative effect involving two-atom two-photon vacuum Rabi oscillations in a high-quality cavity. The two-photon emission occurs as a result of simultaneous deexcitation of both atoms with two-photon ... -
Laser-induced resonance shifts of single molecules self-coupled by a metallic surface
Labeau, O.; Tamarat, Ph.; Courtois, H.; Agarwal, G. S.; Lounis, B. (American Physical Society, 2007-04-05)The spectral properties of single molecules placed near a metallic surface are investigated at low temperatures. Because of the high quality factor of the optical resonance, a laser-induced shift of the molecular lines is ... -
Mesoscopic superposition of states with sub-Planck structures in phase space
Agarwal, G. S.; Pathak, P. K. (American Physical Society, 2004-11-11)We propose the cavity quantum electrodynamics method, using dispersive interaction between atoms and a high-quality cavity to realize the mesoscopic superposition of coherent states that would exhibit sub-Planck structures ... -
Nonclassical correlation of polarization-entangled photons in a biexciton-exciton cascade
Das, Sumanta; Agarwal, G. S. (IOP Publishing, 2008-11-07)We develop a theoretical model to study the intensity–intensity correlation of polarization-entangled photons emitted in a biexciton–exciton cascade. We calculate the degree of correlation and show how polarization ... -
Nonclassical imaging for a quantum search of trapped ions
Agarwal, G. S.; Ariunbold, G. O.; von Zanthier, J.; Walther, H. (American Physical Society, 2004-12-27)We discuss a simple search problem which can be pursued with different methods, either on a classical or on a quantum basis. The system is represented by a chain of trapped ions. The ion to be searched is a member of that ... -
Nonclassicality and decoherence of photon-subtracted squeezed states
Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2007-03-07)We discuss nonclassical properties of single-photon subtracted squeezed vacuum states in terms of the sub-Poissonian statistics and the negativity of the Wigner function. We derive a compact expression for the Wigner ...