Zero-Added-Loss Entangled Photon Multiplexing for Ground- and Space-Based Quantum Networks
arXiv:2206.03670 · doi:10.1103/PhysRevApplied.19.054029
Abstract
We propose a scheme for optical entanglement distribution in quantum networks based on a quasi-deterministic entangled photon pair source. By combining heralded photonic Bell pair generation with spectral mode conversion to interface with quantum memories, the scheme eliminates switching losses due to multiplexing. We analyze this `zero-added-loss multiplexing' (ZALM) Bell pair source for the particularly challenging problem of long-baseline entanglement distribution via satellites and ground-based memories, where it unlocks additional advantages: (i) the substantially higher channel efficiency of \textit{downlinks} vs.\ \textit{uplinks} with realistic adaptive optics, and (ii) photon loss occurring \textit{before} interaction with the quantum memory -- i.e., Alice and Bob receiving rather than transmitting -- improve entanglement generation rate scaling by . Based on numerical analyses, we estimate our protocol to achieve 10ebits/s at memory multiplexing of spin qubits for ground distance 10km, with the spin-spin Bell state fidelity exceeding 99. Our architecture presents a blueprint for realizing global-scale quantum networks in the near-term.
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