GKP-based repeaters with loss-tolerant protocols and modified parity encoding achieve secure key rates comparable to photonic systems while using orders of magnitude fewer qubits.
Yamamoto, The quantum optical repeater, Science 263, 1394 (1994)
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Loss-Tolerant Quantum Communication via Bosonic-GKP-Parity-Encoding
GKP-based repeaters with loss-tolerant protocols and modified parity encoding achieve secure key rates comparable to photonic systems while using orders of magnitude fewer qubits.