The Experts below are selected from a list of 78585 Experts worldwide ranked by ideXlab platform
Iacopo Carusotto - One of the best experts on this subject based on the ideXlab platform.
-
spontaneous quantum emission from analog white holes in a nonlinear Optical Medium
2014Co-Authors: Stefano Finazzi, Iacopo CarusottoAbstract:We use a microscopic quantum Optical model to compute the spectrum of quantum vacuum emission from strong laser pulses propagating in nonlinear Optical media. Similarities and differences with respect to the emission of analog white holes as predicted by quantum field theory in curved spacetime are highlighted. Conceptual issues related to the role played by the material dispersion and to the presence or absence of the horizon are clarified. Critical comparison with available experimental data is made.
Rajendra Bhandari - One of the best experts on this subject based on the ideXlab platform.
-
transpose symmetry of the jones matrix and topological phases
2008Co-Authors: Rajendra BhandariAbstract:The transmission Jones matrix of an arbitrary stack of reciprocal plane-parallel plates that has been turned through 180° about an axis in the plane of the stack is, in an appropriate basis, the transpose of the transmission matrix of the unturned slab with a change in the sign of the off-diagonal elements. We prove this convention-free result for the case where reflection at the interfaces can be ignored and use it to devise an experimental scheme to separate isotropic and topological phase changes in a reciprocal Optical Medium.
-
transpose symmetry of the jones matrix and topological phases
2008Co-Authors: Rajendra BhandariAbstract:The transmission Jones matrix of an arbitrary stack of reciprocal plane parallel plates which has been turned through 180 degrees about an axis in the plane of the stack is, in an appropriate basis, the transpose of the transmission matrix of the unturned slab with a change in the sign of the off-diagonal elements. We prove this convention-free result for the case where reflection at the interfaces can be ignored and use it to devise an experimental scheme to separate isotropic and topological phase changes in a reciprocal Optical Medium.
Yi-tian Gao - One of the best experts on this subject based on the ideXlab platform.
-
Rogue-wave solutions for an inhomogeneous nonlinear system in a geophysical fluid or inhomogeneous Optical Medium
2016Co-Authors: Xi-yang Xie, Bo Tian, Yan Jiang, Wen-rong Sun, Ya Sun, Yi-tian GaoAbstract:Abstract Under investigation in this paper is an inhomogeneous nonlinear system, which describes the marginally-unstable baroclinic wave packets in a geophysical fluid or ultra-short pulses in nonlinear optics with certain inhomogeneous Medium existing. By virtue of a kind of the Darboux transformation, under the Painleve integrable condition, the first- and second-order bright and dark rogue-wave solutions are derived. Properties of the first- and second-order bright and dark rogue waves with α ( t ), which measures the state of the basic flow, and β ( t ), representing the interaction of the wave packet and mean flow, are graphically presented and analyzed: α ( t ) and β ( t ) have no influence on the wave packet, but affect the correction of the basic flow. When we choose α ( t ) as a constant and linear function, respectively, the shapes of the first- and second-order dark rogue waves change, and the peak heights and widths of them alter with the value of β ( t ) changing.
Mark A Neifeld - One of the best experts on this subject based on the ideXlab platform.
-
the speed of information in a fast light Optical Medium
2003Co-Authors: Michael D Stenner, Daniel J Gauthier, Mark A NeifeldAbstract:One consequence of the special theory of relativity is that no signal can cause an effect outside the source light cone, the space-time surface on which light rays emanate from the source1. Violation of this principle of relativistic causality leads to paradoxes, such as that of an effect preceding its cause2. Recent experiments on Optical pulse propagation in so-called ‘fast-light’ media—which are characterized by a wave group velocity υg exceeding the vacuum speed of light c or taking on negative values3—have led to renewed debate about the definition of the information velocity υi. One view is that υi = υg (ref. 4), which would violate causality, while another is that υi = c in all situations5, which would preserve causality. Here we find that the time to detect information propagating through a fast-light Medium is slightly longer than the time required to detect the same information travelling through a vacuum, even though υg in the Medium vastly exceeds c. Our observations are therefore consistent with relativistic causality and help to resolve the controversies surrounding superluminal pulse propagation.
Xiao Tang - One of the best experts on this subject based on the ideXlab platform.
-
single photon frequency up conversion and its applications
2012Co-Authors: Oliver T Slattery, Xiao TangAbstract:Abstract Optical frequency up-conversion is a technique, based on sum frequency generation in a non-linear Optical Medium, in which signal light from one frequency (wavelength) is converted to another frequency. By using this technique, near infrared light can be converted to light in the visible or near visible range and therefore detected by commercially available visible detectors with high efficiency and low noise. The National Institute of Standards and Technology (NIST) has adapted the frequency up-conversion technique to develop highly efficient and sensitive single photon detectors and a spectrometer for use at telecommunication wavelengths. The NIST team used these single photon up-conversion detectors and spectrometer in a variety of pioneering research projects including the implementation of a quantum key distribution system; the demonstration of a detector with a temporal resolution beyond the jitter limitation of commercial single photon detectors; the characterization of an entangled photon pair source, including a direct spectrum measurement for photons generated in spontaneous parametric down-conversion; the characterization of single photons from quantum dots including the measurement of carrier lifetime with escalated high accuracy and the demonstration of the converted quantum dot photons preserving their non-classical features; the observation of 2nd, 3rd and 4th order temporal correlations of near infrared single photons from coherent and pseudo-thermal sources following frequency up-conversion; a study on the time-resolving measurement capability of the detectors using a short pulse pump and; evaluating the modulation of a single photon wave packet for better interfacing of independent sources. In this article, we will present an overview of the frequency up-conversion technique, introduce its applications in quantum information systems and discuss its unique features and prospects for the future.