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We demonstrate a technique that allows to fully control the bandwidth ofentangled photons independently of the frequency band of interest and of thenonlinear crystal. We show that this technique allows to generate nearlytransform-limited biphotons with almost one octave of bandwidth (hundreds ofTHz) which corresponds to correlation times of just a few femtoseconds. Thepresented method becomes an enabling tool for attosecond entangled-photonsquantum optics. The technique can also be used to generate paired photons witha very high degree of entanglement.

Broadening the bandwidth of entangled photons: a step towards the generation of extremely short biphotons