Wavelength conversion for single-photon polarization qubits through continuous-variable quantum teleportation

A quantum internet connects remote quantum processors that need to interact and exchange quantum signals over a long distance through photonic channels. However, these quantum nodes operate at the wavelength ranges unsuitable for long-distance transmission. Therefore, quantum wavelength conversion to telecom bands is crucial for long-distance quantum networks based on optical fiber. Here, we propose wavelength conversion devices for single-photon polarization qubits using continuous-variable quantum teleportation that can efficiently convert qubits between near-infrared (780???795 nm suitable for interacting with atomic quantum nodes) and telecom wavelength (1300???1500 nm suitable for long-distance transmission). The teleportation uses entangled photon fields (i.e., nondegenerate two-mode squeezed state) that can be generated by four-wave mixing in a rubidium atomic gas using a diamond configuration of atomic transitions. The entangled fields can be emitted in two orthogonal polarizations with locked relative phase, making them especially suitable for interfacing with single photon polarization qubits. Our work may pave the way for the realization of long-distance quantum networks.

Automated summary

This study proposes a wavelength conversion device for single-photon polarization qubits using continuous-variable quantum teleportation. It efficiently converts qubits between near-infrared and telecom wavelength, potentially paving the way for long-distance quantum networks.