Abstract
Physics and information are intimately connected, and the ultimate information processing devices will be those that harness the principles of quantum mechanics. Many physical systems have been identified as candidates for quantum information processing, but none of them are immune from errors. The challenge remains to find a path from the experiments of today to a reliable and scalable quantum computer. Here, we develop an architecture based on a simple module comprising an optical cavity containing a single negatively-charged nitrogen vacancy centre in diamond. Modules are connected by photons propagating in a fiber-optical network and collectively used to generate a topological cluster state, a robust substrate for quantum information processing. In principle, all processes in the architecture can be deterministic, but current limitations lead to processes that are probabilistic but heralded. We find that the architecture enables large-scale quantum information processing with existing technology.
Highlights
Quantum computers promise to surpass even the fastest classical computers, but the task of building a quantum computer presents a significant challenge
Many physical systems have been identified as candidates for quantum information processing, but none of them are immune from errors
We find that the architecture enables large-scale quantum information processing with existing technology
Summary
Quantum computers promise to surpass even the fastest classical computers, but the task of building a quantum computer presents a significant challenge. The role of quantum computer architecture is to integrate quantum error correction with feasible experimental technology, to find a path to a reliable and scalable quantum computer In this context, of the many physical systems identified as candidates for quantum information processing [1], the negatively charged nitrogen-vacancy (NV−) center in diamond [3,4,5] features a number of desirable properties [6,7,8,9,10,11,12]. Aside from modules connected by optical fibers, other elements of the architecture are single-photon detection devices and classical control lines These elements are laid out in a regular two-dimensional array, with sufficient connectivity between modules to enable topological cluster-state error correction [33,34,35]. Regardless, the electron spin entanglement distribution schemes used in our approach can be applied to quantum dots and those already proposed in quantum dots can be applied to our case [42,43,44,45,46,47,48,49,50]
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