Speaker
Description
Warm rubidium (Rb) vapor quantum memories are promising platforms for scalable quantum networks due to their technical simplicity and compatibility with room-temperature operation. A key performance metric for these memories is the signal-to-noise ratio (SNR), which directly impacts the fidelity of stored and retrieved quantum states. For practical quantum networking, it is essential that memory performance be independent of the input polarization. In this work, we demonstrate polarization-agnostic operation of a warm Rb quantum memory based on electromagnetically induced transparency (EIT) using a dual-rail architecture.
The memory stores arbitrary polarization states by coherently mapping orthogonal polarization components of the input probe onto two spatially separated atomic ensembles that experience identical optical and magnetic environments. We perform polarization-resolved measurements of the retrieved signal and dominant noise processes, to assess polarization dependence. By preparing the input probe in a complete set of linear and circular polarization states and analyzing the output in multiple polarization bases, we verify uniform storage efficiency and noise characteristics across all polarizations.
We will observe both the retrieval efficiency and SNR for all input polarization states, and validate polarization-agnostic behavior for this dual rail system. A classical Bit Error Rate (BER) will be determined from the SNR, providing insight into the utility of our QMem in a quantum network. This is to be done by comparing the BER to the acceptable limits defined in classical communication schemes. Rail recombination and input power imbalances are expected to be the main contributing factors to SNR discrepancies, as SNR will be calibrated based on detector response to input polarization.
Our work hopes to establish dual-rail warm-vapor quantum memories as robust, polarization-agnostic interfaces for storing polarization-encoded photonic qubits, with direct relevance to quantum repeaters, polarization-multiplexed communication, and room-temperature quantum information processing.
| Keyword-1 | Quantum memorys |
|---|---|
| Keyword-2 | Quantum communications |