EIT Quantum Memory Simulator

A web-based simulator for Electromagnetically Induced Transparency (EIT) quantum memory, allowing users to visualize and understand the process of light storage and retrieval in atomic ensembles.

Overview

This simulator implements a numerical model of photon storage and retrieval in a Λ-type atomic ensemble, based on the formalism developed in Gorshkov et al., Phys. Rev. A 76, 033805 (link). It provides an interactive way to explore:

• Light pulse propagation through an atomic medium
• Storage of light in atomic coherence
• Retrieval of stored light
• Comparison between slow light and memory protocols

Features

• Interactive Parameters: Adjust various physical parameters through an intuitive interface:

  • Atomic properties (medium length, optical depth)
  • Field parameters (detuning, control field strength)
  • Timing parameters (pulse width, control field timing)
  • Simulation parameters (grid resolution, duration)

• Real-time Visualization:

  • Temporal evolution of field intensities
  • Spatiotemporal evolution of field and spin wave intensities
  • Visual indication of the atomic medium region
  • Progress tracking during simulation

Installation

1. Clone the repository:

git clone https://github.com/yourusername/Simulator_EIT_memory.git
cd Simulator_EIT_memory

2. Install the required dependencies:

pip install -r requirements.txt

3. Run the application:

streamlit run app.py

Usage

1. Adjust the simulation parameters in the sidebar:

   • Set atomic properties (medium length, optical depth)
   • Configure field parameters (detuning, control field)
   • Adjust timing parameters
   • Fine-tune simulation settings

2. Click "Run Simulation" to start the calculation

3. Observe the results:

   • Top plot shows temporal evolution of field intensities
   • Bottom plots show spatiotemporal evolution of field and spin wave intensities
   • The atomic medium region is marked in the spatiotemporal plots

Physics Background

The simulator implements the Maxwell-Bloch equations for a Λ-type atomic system:

• Propagation equation for the probe field
• Coupled atomic equations for polarization and spin wave
• Control field protocols for storage and retrieval

For detailed theoretical background, see the "More information about EIT memory" section in the application.

Requirements

• Python 3.7+
• Streamlit
• NumPy
• SciPy
• Plotly