  The generation of nonclassical states of light in miniature chips is a
crucial step towards practical implementations of future quantum technologies.
Semiconductor materials are ideal to achieve extremely compact and massively
parallel systems and several platforms are currently under development. In this
context, spontaneous parametric down conversion in AlGaAs devices combines the
advantages of room temperature operation, possibility of electrical injection
and emission in the telecom band. Here we report on a chip-based AlGaAs source,
producing indistinguishable and energy-time entangled photons with a brightness
of $7.2\times10^6$ pairs/s and a signal-to-noise ratio of $141\pm12$.
Indistinguishability between the photons is demonstrated via a Hong-Ou-Mandel
experiment with a visibility of $89\pm3\%$, while energy-time entanglement is
tested via a Franson interferometer leading to a value for the Bell parameter $
S=2.70\pm0.10$.
