Towards continuous-wave regime teleportation for light matter quantum relay stations

TL;DR

This paper demonstrates a quantum teleportation experiment with narrowband photons at 1560 nm and 795 nm, enabling potential integration with quantum memories for hybrid quantum networks in continuous-wave regimes.

Contribution

It introduces a method for teleporting photons at different wavelengths with narrow spectral bandwidth, compatible with quantum memory devices, advancing hybrid quantum network development.

Findings

Successful teleportation with 25 MHz bandwidth photons

Conversion of 795 nm photons to 1560 nm for interference

Potential for hybrid quantum memory and relay integration

Abstract

We report a teleportation experiment involving narrowband entangled photons at 1560 nm and qubit photons at 795 nm emulated by faint laser pulses. A nonlinear difference frequency generation stage converts the 795 nm photons to 1560 nm in order to enable interference with one photon out of the pairs, i.e., at the same wavelength. The spectral bandwidth of all involved photons is of about 25 MHz, which is close to the emission bandwidth of emissive quantum memory devices, notably those based on ensembles of cold atoms and rare earth ions. This opens the route towards the realization of hybrid quantum nodes, i.e., combining quantum memories and entanglement-based quantum relays exploiting either a synchronized (pulsed) or asynchronous (continuous- wave) scenario.