Parallel Information Transfer in a Multi-Node Quantum Information Processor

Details Parallel Information Transfer in a Multi-Node Quantum Information Processor Parallel Information Transfer in a Multi-Node Quantum Information Processor

2011-07-21

arxiv.org/abs/1107.4333v2

Phys. Rev. Lett. 108, 140502 (2012)

Physics

Quantum Physics

revtex4-1; 7 pages; 5 figures. New version includes minor changes, with updated Fig. 4 and new supplemental material

Scientific paper

10.1103/PhysRevLett.108.140502

We describe a method for coupling disjoint quantum bits (qubits) in different local processing nodes of a distributed node quantum information processor. An effective channel for information transfer between nodes is obtained by moving the system into an interaction frame where all pairs of cross-node qubits are effectively coupled via an exchange interaction between actuator elements of each node. All control is achieved via actuator-only modulation, leading to fast implementations of a universal set of internode quantum gates. The method is expected to be nearly independent of actuator decoherence and may be made insensitive to experimental variations of system parameters by appropriate design of control sequences. We show, in particular, how the induced cross-node coupling channel may be used to swap the complete quantum states of the local processors in parallel.

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