High-performance quantum memories are an essential enabling component for long-distance quantum networking with key applications including quantum key distribution, network-enhanced quantum sensing, distributed quantum computing, etc. Here, we present such a quantum device engineered to meet real-world challenges, while relying solely on room temperature (vacuum-free, cryogen-free) technologies. Based on a warm rubidium vapor, our device offers high-fidelity (94%), high efficiency (5%), long coherence time (up to 1ms), and low operation error (< 10−3), while only takes a standard 2U rackmount space. This result marks an important step transitioning from academic research into integrated and scalable devices working in the fields.
Quantum entanglement sources and memories are critical for quantum networking architecture. For high-rate networking, it is important that both technologies are compatible with each other and existing fiber infrastructure. We present our work on the development of a bichromatic photon source (one in the telecom band and one at near-IR) based on warm atomic vapors. We characterize the source, and show our progress towards interfacing it with atomic memories. This paves the way towards building a quantum repeater node based on room-temperature technologies. These narrow linewidth photons are natively well-suited for interfacing with many quantum communication, computation and sensing technologies.
High-performance quantum memories are a key component for quantum networking infrastructure. Here we demonstrate the first field-deployable, high-fidelity (<95%) memory for photonic polarization qubits based on electromagnetically induced transparency in a warm rubidium vapor. We discuss our work towards optimizing the memory for use in quantum networking applications, specifically to maximize the memory fidelity, efficiency and coherence time. We also describe our engineering efforts in scaling down the size of the memory into a turn-key 2U rackmount device. The module has been designed and tested for use in both academic and industrial settings.
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