The goals of the project are to establish designs for scalable quantum computers in the presence of both hard and soft defects. Scalability is greatly assisted by the principles of quantum communication, that is, the use of heralded long-distance entanglement generation and purification, in conjunction with quantum teleportation, to establish a large-scale cluster state in an inhomogeneous lattice of qubits coupled by nanophotonic structures. Inhomogeneity arises from the presence of defective devices and the need to traverse different distances on a microchip or between different microchips. Using communication concepts, we hope to merge the concepts of topological fault tolerance defined via cluster states of memory qubits with emerging quantum control techniques for quantum dots, solid-state impurities, and cavity QED.
Figure 1. Schematic layout of the components in one node of the distributed architecture. Optical on-chip waveguides route laser pulses originating from off-chip.
Rodney Van Meter, Thaddeus D. Ladd, Austin G. Fowler, and Yoshihisa Yamamoto, "Distributed Quantum Computer Architecture Using Semiconductor Nanophotonics," International Journal of Quantum Information 8, 295-323 (2010). [Preprint]
Dr. Thaddeus Ladd
Prof. Yoshihisa Yamamoto
Prof. Rodney Van Meter (Keio University, Japan) [Group Website]
Dr. Austin Fowler (University of Melbourne, Australia)
National Science Foundation (Project #0829694)