  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.
