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Entangled photons offer two advantages for two-photon absorptionspectroscopy. One of them, the linear scaling of two-photon absorption ratewith the input photon flux, is only valid at very low photon fluxes and istherefore impractical. The other is the overcoming of the classical constraintsfor simultaneous resolution in time-frequency and in space-wavevector. Here weconsider bright squeezed vacuum (BSV) as an alternative to entangled photons.The efficiency increase it offers in comparison with coherent light is modest,but it does not depend on the photon flux. Moreover, and this is what we showin this work, BSV also provides simultaneously high resolution in time andfrequency, and in space and wavevector. In our experiment, we measure thewidths of the second-order correlation functions in space, time, frequency, andangle, and demonstrate the violation of the constraint given by the Fouriertransformation, also known as the Mancini criterion of entanglement.

Bright squeezed vacuum for two-photon spectroscopy: simultaneously high resolution in time and frequency, space and wavevector