C. Monroe, R. Raussendorf, A. Ruthven, K. R. Brown, P. Maunz, L. -M. Duan, J. Kim
The practical construction of scalable quantum computer hardware capable of executing non-trivial quantum algorithms will require the juxtaposition of different types of quantum systems. We propose a modular quantum computer architecture with a hierarchy of interactions that can scale to very large numbers of qubits. Local entangling quantum gates between qubit memories within a single register are accomplished using natural interactions between the qubits, and entanglement between separate registers is completed via a probabilistic photonic interface between qubits in different registers, even over large distances. This architecture compares to the "multicore" classical information processor, and is suitable for the implementation of complex quantum circuits utilizing the flexible connectivity provided by a reconfigurable photonic interconnect network. We further show that this architecture can be made fault-tolerant, a prerequisite for scalability. All of the rudiments of this architecture have been demonstrated in small-scale trapped ion systems, and we speculate on the technological hurdles ahead in order to realize such a system.
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http://arxiv.org/abs/1208.0391
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