We propose a quantum repeater architecture that can operate under ambient conditions. Our proposal builds on recent progress towards non-cryogenic spin-photon interfaces based on nitrogen-vacancy centers, which have excellent spin coherence times even at room temperature, and optomechanics, which allows to avoid phonon-related decoherence and also allows the emitted photons to be in the telecom band. We apply the photon number decomposition method to quantify the fidelity and the efficiency of entanglement established between two remote electron spins. We describe how the entanglement can be stored in nuclear spins and extended to long distances via quasi-deterministic entanglement swapping operations involving the electron and nuclear spins. We furthermore propose schemes to achieve high-fidelity readout of the spin states at room temperature using the spin-optomechanics interface. Our work shows that long-distance quantum networks made of solid-state components that operate at room temperature are within reach of current technological capabilities.
The erratum to this paper has corrected the wrong attenuation length used in the previous paper which produced incorrect repeater rate and fidelity estimates. In this updated version, we investigated the performance of nonmultiplexed and multiplexed repeaters and found that multiplexing is an indispensable part of the proposal that allows for boosted rates and feasible entanglement fidelities at long distances. In particular, Section 4 was substantially rewritten, and Fig. 7 was updated to take into account multiplexing and spin decoherence. In the Appendix, we also added S7 to discuss how to choose the number of multiplexing channels and links to optimize repeater rates and fidelities.
Motivated by these considerations, we propose a complete solid-state quantum repeater architecture that can operate under ambient conditions. We leverage the unique characteristics of nitrogen-vacancy centers in diamond, which have excellent electron spin and nuclear spin coherence even at room temperature. We show that spin-optomechanical interfaces make it possible to create high-fidelity entanglement between remote electron spins at room temperature, circumventing the phonon-induced broadening of the optical transitions. We furthermore show that the same interfaces can also be used to read out the spin states. While we focus on quantum repeaters for this initial proposal, there is a clear path to extend our approach to allow the implementation of fault-tolerant distributed quantum computing as well. Our proposal is a significant step towards the practical implementation of the quantum internet, which will stimulate many exciting new experiments and theoretical studies.
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