scholarly journals Visualizing the emission of a single photon with frequency and time resolved spectroscopy

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 474
Author(s):  
Aleksei Sharafiev ◽  
Mathieu L. Juan ◽  
Oscar Gargiulo ◽  
Maximilian Zanner ◽  
Stephanie Wögerer ◽  
...  
Keyword(s):  
Quantum Electrodynamics ◽  
Quantum Physics ◽  
Single Photon ◽  
High Sensitivity ◽  
Analytical Description ◽  
Ultrafast Dynamics ◽  
Level System ◽  
Time Resolved Fluorescence ◽  
Resonant Frequencies ◽  
Time Resolved

At the dawn of Quantum Physics, Wigner and Weisskopf obtained a full analytical description (a photon portrait) of the emission of a single photon by a two-level system, using the basis of frequency modes (Weisskopf and Wigner, "Zeitschrift für Physik", 63, 1930). A direct experimental reconstruction of this portrait demands an accurate measurement of a time resolved fluorescence spectrum, with high sensitivity to the off-resonant frequencies and ultrafast dynamics describing the photon creation. In this work we demonstrate such an experimental technique in a superconducting waveguide Quantum Electrodynamics (wQED) platform, using single transmon qubit and two coupled transmon qubits as quantum emitters. In both scenarios, the photon portraits agree quantitatively with the predictions of the input-output theory and qualitatively with Wigner-Weisskopf theory. We believe that our technique allows not only for interesting visualization of fundamental principles, but may serve as a tool, e.g. to realize multi-dimensional spectroscopy in waveguide Quantum Electrodynamics.

A multiplexed single-photon instrument for routine measurement of time-resolved fluorescence anisotropy

1987 ◽  
Vol 20 (4) ◽  
pp. 471-473 ◽  
Author(s):  
D J S Birch ◽  
A S Holmes ◽  
J R Gilchrist ◽  
R E Imhof ◽  
S M Al Alawi ◽  
...  
Keyword(s):  
Fluorescence Anisotropy ◽  
Single Photon ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Routine Measurement

scholarly journals Single-photon Coulomb explosion of methanol using broad bandwidth ultrafast EUV pulses

2017 ◽  
Vol 19 (21) ◽  
pp. 13488-13495 ◽  
Author(s):  
Itamar Luzon ◽  
Krishna Jagtap ◽  
Ester Livshits ◽  
Oleg Lioubashevski ◽  
Roi Baer ◽  
...  
Keyword(s):  
Single Photon ◽  
Coulomb Explosion ◽  
Ultrafast Dynamics ◽  
Time Resolved ◽  
Broad Bandwidth ◽  
Time Resolved Imaging

Single-photon Coulomb explosion of methanol using broad bandwidth ultrafast EUV pulses towards achieving time resolved imaging of ultrafast dynamics.

scholarly journals Single photon detection and signal analysis for high sensitivity dosimetry based on optically stimulated luminescence with beryllium oxide

2018 ◽  
Vol 170 ◽  
pp. 09009 ◽  
Author(s):  
J. Radtke ◽  
J. Sponner ◽  
C. Jakobi ◽  
J. Schneider ◽  
M. Sommer ◽  
...  
Keyword(s):  
Data Analysis ◽  
Single Photon ◽  
High Sensitivity ◽  
Beryllium Oxide ◽  
Optically Stimulated Luminescence ◽  
Single Photon Detection ◽  
Single Photon Detector ◽  
Photon Detection ◽  
Time Resolved ◽  
Frequency Information

Single photon detection applied to optically stimulated luminescence (OSL) dosimetry is a promising approach due to the low level of luminescence light and the known statistical behavior of single photon events. Time resolved detection allows to apply a variety of different and independent data analysis methods. Furthermore, using amplitude modulated stimulation impresses time- and frequency information into the OSL light and therefore allows for additional means of analysis. Considering the impressed frequency information, data analysis by using Fourier transform algorithms or other digital filters can be used for separating the OSL signal from unwanted light or events generated by other phenomena. This potentially lowers the detection limits of low dose measurements and might improve the reproducibility and stability of obtained data. In this work, an OSL system based on a single photon detector, a fast and accurate stimulation unit and an FPGA is presented. Different analysis algorithms which are applied to the single photon data are discussed.

Time-resolved fluorescence from biological systems: tryptophan and simple peptides

1980 ◽  
Vol 298 (1439) ◽  
pp. 321-334 ◽  
Keyword(s):  
Time Resolution ◽  
Single Photon ◽  
Photon Counting ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Single Photon Counting ◽  
Fluorescence Measurements ◽  
Mode Locked Lasers ◽  
Electron Transfers ◽  
Sensitive Method

Four methods of applying mode-locked lasers to time-resolved fluorescence measurements in the subnanosecond region are compared. When time resolution below 100 ps is not required, the most precise and sensitive method is single-photon counting, and the application of this method to studies of time-resolved fluorescence of tryptophan in simple peptides is described. The dependence of lifetimes on pH and temperature are interpreted in terms of quenching by intramolecular proton and electron transfers.

Probing ultrafast dynamics of chiral molecules using time-resolved photoelectron circular dichroism

2016 ◽  
Vol 194 ◽  
pp. 325-348 ◽  
Author(s):  
Samuel Beaulieu ◽  
Antoine Comby ◽  
Baptiste Fabre ◽  
Dominique Descamps ◽  
Amélie Ferré ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Extreme Ultraviolet ◽  
Single Photon ◽  
Rydberg States ◽  
Chiral Discrimination ◽  
Infrared Range ◽  
Ultrafast Dynamics ◽  
Chiral Molecules ◽  
Time Resolved ◽  
Circular Dichroïsm

Measuring the ultrafast dynamics of chiral molecules in the gas phase has been a long standing and challenging quest of molecular physics. The main limitation to reach that goal has been the lack of highly sensitive chiroptical measurement. By enabling chiral discrimination with up to several 10% of sensitivity, photoelectron circular dichroism (PECD) offers a solution to this issue. However, tracking ultrafast processes requires measuring PECD with ultrashort light pulses. Here we compare the PECD obtained with different light sources, from the extreme ultraviolet to the mid-infrared range, leading to different ionization regimes: single-photon, resonance-enhanced multiphoton, above-threshold and tunnel ionization. We use single and multiphoton ionization to probe the ultrafast relaxation of fenchone molecules photoexcited in their first Rydberg states. We show that time-resolved PECD enables revealing dynamics much faster than the population decay of the Rydberg states, demonstrating the high sensitivity of this technique to vibronic relaxation.

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