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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 annihilation… Expand
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 for… Expand
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 theory… Expand
Photon transport in a one-dimensional nanophotonic waveguide QED system
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 is… Expand
Counterintuitive dispersion violating Kramers-Kronig relations in gain slabs.
- Li-gang Wang, L. Wang, M. Al-Amri, Shi-yao Zhu, M. S. Zubairy
- Physics, Medicine
- Physical review letters
- 13 June 2014
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. This… Expand
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 the… Expand
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. Even… Expand
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.