Recent Submissions

  • Nonclassical correlation of polarisation entangled photons in a biexciton-exciton cascade 

    Das, S.; Agarwal, Girish Saran; Das, S.; Agarwal, Girish Saran (Journal of Physics B: Atomic, Molecular and Optical Physics, 2008-11-10)
    We develop a theoretical model to study the Intensity-Intensity correlation of polarisation entangled photons emitted in a biexciton-exciton cascade. We calculate the degree of correlation and show how polarisation ...
  • Quantum interferences in cooperative Dicke emission from spatial variation of laser phase 

    Das, S.; Agarwal, Girish Saran; Scully, Marlan O.; Das, S.; Agarwal, Girish Saran (Physical Review Letters, 2008-10-06)
    We report generation of a new quantum interference effect in spontaneous emission from a resonantly driven system of two identical two-level atoms due to the spatial variation of the laser phase at the positions of the ...
  • Entanglement of two distant Bose-Einstein condensates by detection of Bragg-scattered photons 

    Deb, B.; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review A, 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 ...
  • Photon-Photon Correlations as a Probe of Vacuum Induced Coherence Effects 

    Das, S.; Agarwal, Girish Saran; Das, S.; Agarwal, Girish Saran (Physical Review A, 2008-03-27)
    We present new experimental implications of the effects of vacuum induced coherence on the photon -photon correlation in the pi-polarized fluorescence in j = 1/2 to j = 1/2 transition. These effects should be thus observable ...
  • Electromagnetic field induced modification of branching ratios for emission in structured vacuum 

    Das, S.; Agarwal, Girish Saran; Das, S.; Agarwal, Girish Saran (New Journal of Physics, 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 ...
  • Quantum imaging with incoherent photons 

    Thiel, C.; Bastin, Ted; Martin, J.; Solano, E.; Zanthier, J.; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review Letters, 2007-09-28)
    We propose a technique to obtain subwavelength resolution in quantum imaging with potentially 100% contrast using incoherent light. Our method requires neither path-entangled number states nor multiphoton absorption. The ...
  • Solitons in interacting Dicke models of coupled cavities with two-level systems 

    Paternostro, M.; Agarwal, Girish Saran; Kim, M. S.; Agarwal, Girish Saran (2007-07-05)
    We consider an array of coupled optical cavities, each containing a multi-atom ensemble. We show that the nonlinearity inherent in the cooperative dynamics of the atoms in each ensemble coupled to the respective cavity ...
  • Realization of quantum-mechanical weak values of observables using entangled photons 

    Agarwal, Girish Saran; Pathak, P. K.; Agarwal, Girish Saran (Physical Review A, 2007-04-12)
    We present a scheme for realization of quantum-mechanical weak values of observables using entangled photons produced in parametric down-conversion. We consider the case when the signal and idler modes are respectively in ...
  • Laser induced resonance shifts of single molecules self-coupled by a metallic surface 

    Labeau, O.; Tamarat, P.; Courtois, H.; Agarwal, Girish Saran; Lounis, B.; Agarwal, Girish Saran (Physical Review Letters, 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 ...
  • Fast light solitons in resonant media 

    Agarwal, Girish Saran; Dey, T. N.; Agarwal, Girish Saran (Physical Review A, 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. ...
  • Measurement-induced spatial modulation of spontaneous decay and photon arrival times 

    Zanthier, J.; Bastin, Ted; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review A, 2006-12-20)
    We report a way of manipulating the spontaneous emission process leading to a spatial modulation of spontaneous decay. The effect is observed in the case of coherently driven atoms separated by less than a transition ...
  • Nonclassicality and decoherence of photon-subtracted squeezed states 

    Biswas, A.; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review A, 2006-12-04)
    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 ...
  • Towards Heisenberg limit in magnetometry with parametric down converted photons 

    Kolkiran, A.; Agarwal, Girish Saran; Kolkiran, A.; Agarwal, Girish Saran (Physical Review A, 2006-11-16)
    Recent theoretical and experimental papers have shown how one can achieve Heisenberg limited measurements by using entangled photons. Here we show how the photons in non-collinear down conversion process can be used for ...
  • Competition between electromagnetically induced transparency and Raman processes 

    Agarwal, Girish Saran; Dey, T. N.; Gauthier, Daniel; Agarwal, Girish Saran (Physical Review A, 2006-10-05)
    We present a theoretical formulation of competition among electromagnetically induced transparency (EIT) and Raman processes. The latter become important when the medium can no longer be considered to be dilute. Unlike the ...
  • Extreme subwavelength atom localization via coherent population trapping 

    Agarwal, Girish Saran; Kapale, K. T.; Agarwal, Girish Saran (Journal of Physics B: Atomic, Molecular and Optical Physics, 2006-09-06)
    We demonstrate an atom localization scheme based on monitoring of the atomic coherences. We consider atomic transitions in a Lambda configuration where the control field is a standing-wave field. The probe field and the ...
  • Entanglement by linear SU(2) transformations: generation and evolution of quantum vortex states 

    Agarwal, Girish Saran; Banerji, J.; Agarwal, Girish Saran (Journal of Physics A: Mathematical and General, 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, ...
  • Interferences in parametric interactions driven by quantized fields 

    Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review Letters, 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 ...
  • New class of exact solitary wave solutions of one dimensional Gross-Pitaevskii equation 

    Atre, R.; Panigrahi, P. K.; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review E, 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/loss, in both expulsive and regular parabolic confinement regimes. ...
  • Two-photon excitation dynamics in bound two-body Coulomb systems including ac Stark shift and ionization 

    Haas, M.; Jentschura, Ulrich D.; Keitel, C. H.; Kolachevsky, N.; Herrmann, M.; Fendel, P.; Fischer, M.; Udem, T.; Holzwarth, R.; Hansch, T. W.; Scully, Marlan O.; Agarwal, Girish Saran; Agarwal, Girish Saran (Physical Review A, 2006-05-03)
    One of the dominant systematic effects that shift resonance lines in high-precision measurements of two-photon transitions is the dynamic ac[1] Stark shift. For suitable laser frequencies, the ac Stark shift acquires an ...
  • Ultraslow light in inhomogeneously broadened media 

    Agarwal, Girish Saran; Dey, T. N.; Agarwal, Girish Saran (Physical Review A, 2006-04-19)
    We calculate the characteristics of ultraslow light in an inhomogeneously broadened medium. We present analytical and numerical results for the group delay as a function of power of the propagating pulse. We apply these ...

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