Coherently controlling the spectral properties of energy-entangled photons is a key component of future entangled two-photon spectroscopy schemes that are expected to provide advantages with respect to classical methods. We present here an experimental setup based on a grating compressor. It allows for the spectral shaping of entangled photons with a sevenfold increase in resolution, compared to previous setups with a prism compressor. We evaluate the performances of the shaper by detecting sum frequency generation in a nonlinear crystal with both classical pulses and entangled photon pairs. The efficiency of both processes is experimentally compared and is in accordance with a simple model relating the classical and entangled two-photon absorption coefficients. Finally, the entangled two-photon shaping capability is demonstrated by implementing an interferometric transfer function.
Experimental requirements for entangled two-photon spectroscopy
Note: This paper is part of the JCP Special Topic on Quantum Light.
Stefan Lerch, André Stefanov; Experimental requirements for entangled two-photon spectroscopy. J. Chem. Phys. 14 August 2021; 155 (6): 064201. https://doi.org/10.1063/5.0050657
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