Photonic architecture for scalable quantum information processing in NV-diamond

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.

24 pages, 14 Figures. Comment welcome

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• High-Fidelity Spin Measurement on the Nitrogen-Vacancy Center
• A cavity-mediated quantum CPHASE gate between NV spin qubits in diamond
• Room-Temperature entangled quantum processor on integrated semiconductor photonics platform
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• A Regular Representation of Quantum Circuits
• Special Session: Noisy Intermediate-Scale Quantum (NISQ) Computers -- How They Work, How They Fail, How to Test Them?
• A solution to electric-field screening in diamond quantum electrometers
• Large-Range Tuning and Stabilization of the Optical Transition of Diamond Tin-Vacancy Centers by In-Situ Strain Control
• Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates
• Long-range photon-mediated gate scheme between nuclear spin qubits in diamond
• Coherent Electric-Field Control of Orbital state in a Neutral Nitrogen-Vacancy Center
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