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The noisy and lengthy nature of quantum communication hinders the developmentof distributed quantum computing. The inefficient design of existing compilersfor distributed quantum computing worsens the situation. Previous compilationframeworks couple communication hardware with the implementation of expensiveremote gates. However, we discover that the efficiency of quantumcommunication, especially collective communication, can be significantlyboosted by decoupling communication resources from remote operations, that is,the communication hardware would be used only for preparing remoteentanglement, and the computational hardware, the component used to storeprogram information, would be used for conducting remote gates. Based on theobservation, we develop a compiler framework to optimize the collectivecommunication happening in distributed quantum programs. In this framework, wedecouple the communication preparation process in communication hardware fromthe remote gates conducted in computational hardware by buffering EPR pairsgenerated by communication hardware in qubits of the computational hardware.Experimental results show that the proposed framework can halve thecommunication cost of various distributed quantum programs, compared tostate-of-the-art compilers for distributed quantum computing.

CollComm: Enabling Efficient Collective Quantum Communication Based on EPR buffering