Performing quantum entangled biphoton spectroscopy using classical light pulses

• URL: http://arxiv.org/abs/2306.14424v1
• Date: Mon, 26 Jun 2023 05:11:14 GMT
• Title: Performing quantum entangled biphoton spectroscopy using classical light pulses
• Authors: Liwen Ko, Robert L. Cook, K. Birgitta Whaley
• Abstract summary: We show that for a class of quantum light spectroscopy (QLS) experiments, identical signals can be obtained by replacing the biphotons with classical-like coherent states of light. This analysis shows that understanding the equivalence between entangled biphoton probes and carefully designed classical-like coherent state probes leads to quantum-inspired experiments.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that for a class of quantum light spectroscopy (QLS) experiments using n = 0,1,2,$\cdots$ classical light pulses and an entangled photon pair (a biphoton state) where one photon acts as a reference without interacting with the matter sample, identical signals can be obtained by replacing the biphotons with classical-like coherent states of light, where these are defined explicitly in terms of the parameters of the biphoton states. An input-output formulation of quantum nonlinear spectroscopy is used to prove this equivalence. We demonstrate the equivalence numerically by comparing a classical pump - quantum probe experiment with the corresponding classical pump - classical probe experiment. This analysis shows that understanding the equivalence between entangled biphoton probes and carefully designed classical-like coherent state probes leads to quantum-inspired classical experiments and provides insights for future design of QLS experiments that could provide a true quantum advantage.

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