Abstract
In this article we present a simple repeater scheme based on the negatively-charged nitrogen vacancy centre in diamond. Each repeater node is built from modules comprising an optical cavity containing a single NV−, with one nuclear spin from 15N as quantum memory. The module uses only deterministic processes and interactions to achieve high fidelity operations (>99%), and modules are connected by optical fiber. In the repeater node architecture, the processes between modules by photons can be in principle deterministic, however current limitations on optical components lead the processes to be probabilistic but heralded. Our resource-modest repeater architecture contains two modules at each node, and the repeater nodes are then connected by entangled photon pairs. We discuss the performance of such a quantum repeater network with modest resources and then incorporate more resource-intense strategies step by step. Our architecture should allow large-scale quantum information networks with existing or near future technology.
Highlights
In this article we present a simple repeater scheme based on the negatively-charged nitrogen vacancy centre in diamond
It is already clear that large scale quantum computers will be able to perform tasks impossible in the classical world, it is a daunting tasks to realise due to the huge number of physical qubits required[5,6,7,8,9,10,11,12]
We have presented a simple repeater scheme based on NV− centers in diamond which can be used for a few node network, yet scaled to a large scale networks as more resources become available
Summary
We may require optical elements such as photon detectors, beam splitters, single photon and Bell state sources and coherent frequency converters. The module is an interface between photon and matter qubits which store and process the quantum data. We illustrate a design of such a module and its functions using a single NV− center embedded in an optical cavity. The module consists of an optical cavity and a single NV centre (NV−) in diamond. The single NV− centre provides an electron spin −1 and the nuclear spin −1/2 of 15N. The Hamiltonian of the single NV− centre[36,47] is ( ) Hnv = DSz2 + E Sx2 − Sy2 + geμBBSz g nμnBI z
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