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Now showing items 1-10 of 44

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

(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 imaging with incoherent photons

(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 ...

#### Inseparability inequalities for higher order moments for bipartite systems

(New Journal of Physics, 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 ...

#### DC field induced enhancement and inhibition of spontaneous emission in a cavity

(Physical Review A, 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 ...

#### Mesoscopic superposition of states with sub-Planck structures in phase space

(Physical Review A, 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 ...

#### Realization of quantum-mechanical weak values of observables using entangled photons

(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 ...

#### Solitons in interacting Dicke models of coupled cavities with two-level systems

(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 ...

#### Vacuum induced Stark shifts for quantum logic using a collective system in a high quality dispersive cavity

(Physical Review A, 2005-05-13)

A collective system of atoms in a high quality cavity can be described by a nonlinear interaction which arises due to the Lamb shift of the energy levels due to the cavity vacuum [Agarwal et al., Phys. Rev. A 56, 2249 ...

#### Quantum random walk of the field in an externally driven cavity

(Physical Review A, 2005-09-16)

Using resonant interaction between atoms and the field in a high quality cavity, we show how to realize quantum random walks as proposed by Aharonov et al [Phys. Rev. A 48, 1687 (1993)]. The atoms are driven strongly by a ...

#### Towards Heisenberg limit in magnetometry with parametric down converted photons

(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 ...