We report on experimental implementation of a multifunctional two-photon state analyzer. The device aims to be compact and able to provide several important characteristics about any two-photon quantum state. It operates in two modes: first mode is the two-photon interference analysis giving the information about spectral properties of the photons and the degree of mutual indistinguishability. The second mode provides polarization analysis and complete two-photon state tomography. Density matrix estimated from the tomography data reveals namely the quantum state purity or negativity. This device was tested on the photon pairs generated by the Kwiat source.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1364/AO.51.000474 | DOI Listing |
Nat Commun
January 2025
NanoLund and Solid State Physics, Lund University, Box 118, 22100, Lund, Sweden.
Nonlinear effects play a central role in photonics as they form the foundation for most of the device functionalities such as amplification and quantum state preparation and detection. Typically the nonlinear effects are weak and emerge only at high photon numbers with strong drive. Here we present an experimental study of a Josephson junction -based high-impedance resonator.
View Article and Find Full Text PDFBackground: Preclinical Alzheimer's disease research has gained traction as a potential point of intervention, though it is relatively unknown how early stages of the disease impact cortical health. The following study utilizes optical imaging methods (Figure 1) to characterize changes in neuronal, glutamate, and hemodynamic activities in a preclinical amyloidosis mouse model of the disease.
Method: Five (n = 5; 2 females & 3 males) APPswe/PS1dE9 x Thy1-jRGECO1a double transgenic mice were breed for whole-brain fluorescent imaging of neuronal activity.
J Neuroinflammation
January 2025
Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, 92697, USA.
Background: Immunothrombosis is the process by which the coagulation cascade interacts with the innate immune system to control infection. However, the formation of clots within the brain vasculature can be detrimental to the host. Recent work has demonstrated that Toxoplasma gondii infects and lyses central nervous system (CNS) endothelial cells that form the blood-brain barrier (BBB).
View Article and Find Full Text PDFNanoscale
January 2025
The Canter for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, USA.
Laser diodes based on solution-processed semiconductor quantum dots (QDs) present an economical and color-tunable alternative to traditional epitaxial lasers. However, their efficiency is significantly limited by non-radiative Auger recombination, a process that increases lasing thresholds and diminishes device longevity through excessive heat generation. Recent advancements indicate that these limitations can be mitigated by employing spherical quantum wells, or quantum shells (QSs), in place of conventional QDs.
View Article and Find Full Text PDFChem Commun (Camb)
January 2025
State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China.
A fluorescence quenching mechanism using linear diselenides was proposed for the first time through a combination of intramolecular charge transfer (ICT) and Förster resonance energy transfer (FRET). Herein, we synthesized and screened a two-photon fluorescent probe AFC-SeSe, demonstrating a remarkable 300-fold increase in response to glutathione (GSH). Additionally, AFC-SeSe enabled real-time observation of increased thiol levels following treatment within a short timeframe in a mouse model of stroke.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!