Constant-Rate Entanglement Distillation for Fast Quantum Interconnects

Distributed quantum computing allows the modular construction of large-scale quantum computers and enables new protocols for blind quantum computation.However, such applications in the large-scale, fault-tolerant regime place stringent demands on the fidelity and rate of entanglement generation, which are not met by existing methods for quantum interconnects.In this work, we develop constant-rate entanglement distillation methods to address this bottleneck in the setting of noisy local operations.By using a sequence of two-way entanglement distillation protocols based on quantum error detecting codes with increasing rate, and combining with standard fault tolerance techniques, we achieve constant-rate entanglement distillation.We show that the scheme has constant-rate in expectation, and further numerically optimize to achieve low practical overhead under memory constraints.We find that compared to existing quantum interconnect * Both authors contributed equally to this research.