1GHz clocked distribution of electrically generated entangled photon pairs
Ginny Shooter, Zi-Heng Xiang, Jonathan Muller, J. Skiba-Szymanska, Jan Huwer, Jonathan Griffiths, Thomas A. Mitchell, Matthew William Anderson, Tina Müller, Andrey B Krysa, R. M. Stevenson, Jon Heffernan, D. A. Ritchie, Andrew J. Shields · Optics Express · 2020
Quantum networks are essential for realising distributed quantum computation and quantum communication. Entangled photons are a key resource, with applications such as quantum key distribution, quantum relays, and quantum repeaters. All components integrated in a quantum network must be synchronised and therefore comply with a certain clock frequency. In quantum key distribution, the most mature technology, clock rates have reached and exceeded 1GHz. Here we show the first electrically pulsed sub-Poissonian entangled photon source compatible with existing fiber networks operating at this clock rate. The entangled LED is based on InAs/InP quantum dots emitting in the main telecom window, with a multi-photon probability of less than 10% per emission cycle and a maximum entanglement fidelity of 89%. We use this device to demonstrate GHz clocked distribution of entangled qubits over an installed fiber network between two points 4.6km apart.