DOI: 10.5281/zenodo.15174553
title: Keeping the photon in the dark: Enabling quantum dot dark state control by chirped pulses and magnetic fields

description: The preprint of the publication can be found at arXiv:2404.10708. This dataset contains all the processed and raw data in ".csv", ".txt" and ".mat". We split the folder structure in the same way as the figures in the paper:



Figure 1:



d: Spectra is the raw spectra taken

e: 



Raw_Data and its subfolders "0.0T" to "4.0T" include bidirectional histogram data from a start-stop measurement between stimulation pulse and bright/dark exciton photon

g_factor_fitting.mat contains the fitting results of the bright and dark lifetimes from a simulation. The file is called with g_factor_fitting_plotting.m, and the individual data is saved in g_factor_fit_result.xls






 



Figure 2 b-c: Data of time resolved single photon measurements for horizontally- and vertically polarised quantum dot photons, found in the subfolders h_pol and v_pol. Both contain arrival time experiment (start-stop) between stimulation pulse and quantum dot photons (both bright and one dark exciton photon) given as lifetime_... as well as single photon purity measurements g2_.... Extensions such as m45 (p45), -45ps2 (+45ps2), denote measurements for only one pulse with the corresponding chirp (m, -=minus, p, +=plus). The collected spectra for the pulse powers given in the paper are provided in the files spec_..., again with the same extension convention as above (only TPE corresponds to only the resonant excitation of the biexciton).


 



Figure 3: Simulation data for the time dynamics and dressed state analysis. The time dynamics with and without phonons can be found in either time_dynamics_full_sequence_new_states_4.mat and time_dynamics_full_sequence_new_states_4_w_phonons.mat as matlab files or state_population.xlsx and state_population_w_phonons.xlsx as a table. The dressed state data can be found in DS_analysis_ideal_pulse.mat or dots_dressedstates_sim.xlsx , correspondingly. An example for plotting the .mat files is located in Simulation_time_dynamic_plotting.m.


 



Figure 4: This folder contains data for the 2D maps in the paper. We divide the folders further into the experimentally collected data sets in Raw_Data and interpolated data, as well as simulation data in Processed_Data.  Since the power values fluctuate over the course of the experiment, we interpolated the photon counts on an evenly spaced power grid.



a_timedelay



Raw_Data



Spectra recorded spectra for every time delay and stimulation pulse power step

PowerVals including files for each time delay step where the stimulation power was recorded and for each power the integrated dark and bright exciton counts calculated. The time delay vector is found in the Processed_Data.



Processed_Data The interpolated data of the 2D map is found in darkX_scan.mat or spectrum_DX_2D_interpolated.xlsx. The time delay, as well as equally spaced power values, are given in time_delay_raw.txt and power_linear.txt, respectively. Data for the storage fidelity is given in either dx_time_delay_pop_with_overlap.mat or dx_time_delay_pop_with_overlap.xlsx. Examples for the analysis can be found in Time_delay_plotting.m.



b_polarisation



Raw_Data



Spectra recorded spectra for every angle and stimulation pulse power step

PowerVals including files for each angle step where the stimulation power was recorded and for each power the integrated dark and bright exciton counts calculated. The angle vector is found in the Processed_Data.



Processed_Data The interpolated data of the 2D maps for dark and bright exciton is found in Stim_pol.mat or spectrum_BX_2D_interpolated.xlsx and spectrum_DX_2D_interpolated.xlsx, respectively. The angle, as well as equally spaced power values, are given in HWP_angle_linear.txt and power_linear.txt. Simulation data is given in stim_into_dark_polarisation_scan_new_3.4T_new_in_Bx_states.mat and BX_pop_sim_2D.xlsx and DX_pop_sim_2D.xlsx for both horizontally polarised bright and dark exciton states. The angle values and stimulation pulse areas used in the simulation are again given in the .mat file, or pol_angle_for_sim.txt and stim_pulse_area_sim.txt. Examples for the analysis can be found in stim_pol_scan_plotting.m.



d_detuning



Raw_Data 



Spectra recorded spectra for every detuning and stimulation pulse power step

PowerVals including files for each detuning step where the stimulation power was recorded and for each power the integrated dark and bright exciton counts calculated. The detuning vector is found in the Processed_Data.



Processed_Data The interpolated data of the 2D map is found in darkX_detuning_map.mat or spectrum_DX_2D_interpolated.xlsx. The detuning, as well as equally spaced power values, are given in detuning_linear.txt and power_linear.txt, respectively. The population data for the simulation is given in either stim_into_dark_detuning_scan_new_3.4T_new_in_Bx_states.mat or DX_2D_pop_sim.xlsx, while the used detuning and stimulation pulse areas can be found again in the .mat file or detuning_linear_sim.txt and stim_pulse_area_sim.txt. Examples for the analysis can be found in Detuning_map_plotting.m.






 

Contact

For any questions or concerns, please feel free to contact the authors:

florian.kappe.fk@gmail.com

and

rene.schwarz@uibk.ac.at