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 Anderson, Tina Müller, A. B. Krysa, R. M. Stevenson, Jon Heffernan, D. A. Ritchie, A. J. Shields
Abstract
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.