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We study the generation of single-photon pulses with the tailored temporalshape via nonlocal spectral filtering. A shaped photon is heralded from atime-energy entangled photon pair upon spectral filtering and time-resolveddetection of its entangled counterpart. We show that the temporal shape of theheralded photon is defined by the time-inverted impulse response of thespectral filter and does not depend on the heralding instant. Thus one canavoid post-selection of particular heralding instants and achieve substantiallyhigher heralding rate of shaped photons as compared to the generation ofphotons via nonlocal temporal modulation. Furthermore, the method can be usedto generate shaped photons with a coherence time in the ns-$\mu$s range and isparticularly suitable to produce photons with the exponentially rising temporalshape required for efficient interfacing to a single quantum emitter in freespace.

Efficient generation of temporally shaped photons using nonlocal spectral filtering