Kaushik Seshadreesan

We propose a novel strategy of using the Gottesman-Kitaev-Preskill (GKP) code in a two-way repeater architecture with multiplexing. The crucial feature of the GKP code that we make use of, is the fact that GKP qubits easily admit deterministic two-qubit gates, hence allowing for deterministic entanglement swapping. Furthermore, thanks to the availability of the analog information generated during the measurement of the GKP qubits, we can design better entanglement swapping procedures between the multiplexed elementary links. To boost the loss-resilience of our encoded qubits, we consider a concatenation of the GKP code with the discrete variable [[7,1,3]] code which has already proven effective in the context of quantum repeater schemes. We find that our architecture allows for high-rate near-deterministic end-to-end entanglement generation with much larger repeater spacing than for the previously considered error-correction based repeater schemes.