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Now showing items 21-30 of 37
Transfer of an unknown quantum state, quantum networks, and memory
(American Physical Society, 2004-08-27)
We present a protocol for transfer of an unknown quantum state. The protocol is based on a two-mode cavity interacting dispersively in a sequential manner with three-level atoms in the Lambda configuration. We propose a ...
Electromagnetic field induced modification of branching ratios for emission in structured vacuum
(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 ...
Subluminal to superluminal propagation in a left-handed medium
(American Physical Society, 2004-03-22)
In this paper we report large group delays in the propagation of narrow-band pulses through a dispersive medium with both dielectric function and magnetic permeability negative. We show how the numerical results can be ...
Mesoscopic superposition of states with sub-Planck structures in phase space
(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 ...
Towards the Heisenberg limit in magnetometry with parametric down-converted photons
(American Physical Society, 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 a noncollinear down-conversion process can be used for ...
Quantum imaging with incoherent photons
(American Physical Society, 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 ...
Realization of quantum-mechanical weak values of observables using entangled photons
(American Physical Society, 2007-03-12)
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 ...
Superluminal propagation via coherent manipulation of the Raman gain process
(American Physical Society, 2004-08-12)
We present a method of manipulating the Raman process by using a coherent control field which leads to splitting of the Raman gain peak into a doublet and anomalous dispersion in the region between the gain peaks. We show ...
Two-photon excitation dynamics in bound two-body Coulomb systems including ac Stark shift and ionization
(American Physical Society, 2006-05-03)
One of the dominant systematic effects that shift resonance lines in high-precision measurements of twophoton transitions is the dynamic (ac) Stark shift. For suitable laser frequencies, the ac Stark shift acquires an ...
Implementing Deutsch-Jozsa algorithm using light shifts and atomic ensembles
(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 ...