  For the development of long-distance quantum networks, sources of single
photons and entangled photon pairs emitting in the low-loss wavelength region
around 1550 nm are a crucial building block. Here we show that quantum dot
devices based on indium phosphide are capable of electrically injected single
photon emission in this wavelength region with multiphoton events suppressed
down to 0.11$\pm$0.02. Using the biexciton cascade mechanism, they further
produce entangled photons with a fidelity of 87$\pm$4%, sufficient for the
application of one-way error correction protocols. The new material allows for
entangled photon generation up to an operating temperature of 93 K, reaching a
regime accessible by electric coolers. The quantum photon source can be
directly integrated with existing long distance quantum communication and
cryptography systems and provides a new material platform for developing future
quantum network hardware.
