Quantum buses and quantum computer architecture based on quantum dots

Details Quantum buses and quantum computer architecture based on quantum dots Quantum buses and quantum computer architecture based on quantum dots

2005-11-18

arxiv.org/abs/cond-mat/0511470v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We propose a quantum computer architecture based on quantum dots both for short distance and for long distance communication/computation. Our scheme exploits the natural characteristics of self-assembled quantum dots and it is scalable. It is centered on the idea of a quantum bus based on semiconductor self-assembled quantum dots. This allows for transmission of qubits between the different quantum registers, and could be integrated in most of the present proposal for semiconductor quantum dot-based quantum computation. Our proposal exploits the peculiar properties of {\it relatively short} spin-chains, and advantages and disadvantages of two possible implementations, both based on spin-chain global dynamics, are discussed in details. A clear advantage of the scheme is to avoid the use of microcavities for long distance communication between different elements of the quantum computer. In this respect our scheme is comparatively faster than hybrid quantum dot-microcavity schemes.

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