Scalable spin–photon entanglement by time-to-polarization conversion

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Abstract

The realization of quantum networks and quantum computers relies on the scalable generation of entanglement, for which spin-photon interfaces are strong candidates. Current proposals to produce entangled-photon states with such platforms place stringent requirements on the physical properties of the photon emitters, limiting the range and performance of suitable physical systems. We propose a scalable protocol, which significantly reduces the constraints on the emitter. We use only a single optical transition and an asymmetric polarizing interferometer. This device converts the entanglement from the experimentally robust time basis via a path degree of freedom into a polarization basis, where quantum logic operations can be performed. The fundamental unit of the proposed protocol is realized experimentally in this work, using a nitrogen-vacancy center in diamond. This classically assisted protocol greatly widens the set of physical systems suited for scalable entangled-photon generation and enables performance enhancement of existing platforms.

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Vasconcelos, R., Reisenbauer, S., Salter, C., Wachter, G., Wirtitsch, D., Schmiedmayer, J., … Trupke, M. (2020). Scalable spin–photon entanglement by time-to-polarization conversion. Npj Quantum Information, 6(1). https://doi.org/10.1038/s41534-019-0236-x

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