Speaker
Description
Electromagnetically induced transparency (EIT)–based quantum memories require an atomic ensemble with sufficient optical depth and stable frequency detuning conditions. In this work, we characterize a Rb-87 atomic vapor cell by measuring near-resonant absorption (transmission) spectra under controlled temperature settings, aiming to identify suitable operating conditions for subsequent EIT storage experiments. The transmitted probe signal is recorded during repeated laser scans across the D-line resonance region. To enable reliable comparisons across scans and temperatures, we implement an anchor-based piecewise frequency-axis alignment that compensates scan nonlinearity and slow drifts, using reproducible spectral landmarks as reference points. The aligned spectra are averaged to form a robust reference absorption profile, and key spectral metrics (e.g., absorption depth and effective linewidth) are tracked as functions of temperature. The measurements show a clear temperature dependence of the absorption strength, consistent with an increase in vapor number density, while the observed linewidth reflects combined broadening and decoherence contributions. These results provide (i) a practical temperature-dependent characterization of absorption background and effective optical depth and (ii) a repeatable relative-detuning reference for locating and monitoring EIT operating points in a warm-vapor quantum memory platform.Keywords: EIT, quantum memory, Rb-87 vapor cell, absorption spectroscopy, temperature dependence, frequency alignment
| Keyword-1 | EIT |
|---|---|
| Keyword-2 | quantum memory |
| Keyword-3 | absorption spectroscopy |