Kavli Affiliate: Birgitta Whaley
| First 5 Authors: Liwen Ko, Robert L. Cook, K. Birgitta Whaley, ,
| Summary:
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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