  Electro-optic time lenses are promising experimental components for photonic
spectral-temporal processing of quantum information. We report a stable method
to realize an electro-optic time lens, which relies on the amplification of an
electronic response of a fast photodiode. The method does not require a
repetitive clock and may be applied to aperiodic optical signals. We
experimentally demonstrate the approach using single-photon pulses and directly
verify its aperiodicity. The approach will enable construction of complex
electro-optic temporal optical systems.
