(color online) The architecture of our hybrid SC circuit memory system. The whole quantum memory system consists of three flux qubits and an NV ensemble. The computing qubit (CQ) is employed as the computing unit. Memory qubit (MQ) together with the NV ensemble compose the memory unit. The ancillary qubit (AQ) plays the role in data transmission between the computing unit and the memory. Coupling spatially separated computing units A, B, C, D, …, and the memory unit M respectively, a series of memory systems are composed. By storing and retrieving the quantum information, they can act as a quantum data bus.