Quantum Teleportation was achieved over an Optical Fiber Network

Quantum teleportation was achieved over an optical fiber network for the first time.

Combining quantum and conventional networks within the same optical fibers could significantly accelerate the adoption of quantum network technology on a large scale.

Quantum teleportation, a key process in quantum networking, had not previously been demonstrated in fibers carrying high-power conventional optical signals. Here, we present what is, to our knowledge, the first demonstration of quantum teleportation over fibers transmitting conventional telecommunications traffic.

We successfully transferred quantum states over a 30.2-km fiber carrying 400-Gbps C-band classical data, with a Bell state measurement at the fiber’s midpoint. To preserve quantum fidelity against noise from spontaneous Raman scattering, we employed optimal O-band quantum channels, precise spectro-temporal filtering, and multi-photon coincidence detection.

The fidelity remained robust even at a high C-band launch power of 18.7 dBm for the single-channel 400-Gbps signal. This suggests potential support for multiple classical channels with aggregate data rates in the terabit range.

This study demonstrates the practicality of integrating advanced quantum and classical network applications within a shared fiber infrastructure.

source Optica