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Entanglement conditions for two-mode states.
We provide a class of inequalities whose violation shows the presence of entanglement in two-mode systems. We initially consider observables that are quadratic in the mode creation and annihilationExpand
Uncertainty inequalities as entanglement criteria for negative partial-transpose States.
In this Letter, we show that the fulfillment of uncertainty relations is a sufficient criterion for a quantum-mechanically permissible state. We specifically construct two pseudospin observables forExpand
Single-photon transport through an atomic chain coupled to a one-dimensional nanophotonic waveguide
We study the dynamics of a single-photon pulse traveling through a linear atomic chain coupled to a one-dimensional (1D) single mode photonic waveguide. We derive a time-dependent dynamical theoryExpand
Control of the Goos-Hänchen shift of a light beam via a coherent driving field
We present a proposal to manipulate the Goos-Haenchen shift of a light beam via a coherent control field, which is injected into a cavity configuration containing the two-level atomic medium. It isExpand
Counterintuitive dispersion violating Kramers-Kronig relations in gain slabs.
We demonstrate the counterintuitive dispersion effect that the peaks (dips) in the gain spectrum correspond to abnormal (normal) dispersion, contrary to the usual Kramers-Kronig point of view. ThisExpand
Reversing entanglement change by a weak measurement
Entanglement of a system changes due to interactions with the environment. A typical type of interaction is amplitude damping. If we add a detector to monitor the environment and only select theExpand
Reversing the weak measurement of an arbitrary field with finite photon number
For an arbitrary field with finite photon number inside a leaky cavity, we show that the null-result measurement can be conditionally reversed, using either multiple atoms or a multilevel atom. EvenExpand
Squeezed states in the Jaynes-Cummings model
Abstract It is shown that squeezed states of the electromagnetic field are obtained in the Jaynes-Cummings model of an atomic transition coupled to a single mode, quantized electromagnetic field.