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13 March 2024 Challenges in fluorescence-detected entangled two-photon-absorption experiments: exploring the low-to-high-gain squeezing regimes
Brian J. Smith, Michael G. Raymer, Tiemo Landes
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Proceedings Volume PC12863, Quantum Effects and Measurement Techniques in Biology and Biophotonics; PC128630B (2024) https://doi.org/10.1117/12.3003759
Event: SPIE BiOS, 2024, San Francisco, California, United States
Abstract
The rate of two-photon absorption of time-frequency-entangled photon pairs has been the subject of much study for its potential to enable quantum-enhanced molecular spectroscopy and imaging. We closely replicated recent experiments that reportedly observed such enhancement and have found that in the low-photon-flux regime the signal is below detection threshold. Using an optical parametric down-conversion photon-pair source that can be varied from the low-gain spontaneous regime to the high-gain squeezing regime, we observe two-photon absorption with a molecular sample in solution for the high-gain regime but not for the low-gain regime. The observed rates are consistent with theoretical predictions and indicate that time-frequency photon entanglement does not yet provide a practical means to enhance spectroscopy or imaging with current techniques.
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Brian J. Smith, Michael G. Raymer, and Tiemo Landes "Challenges in fluorescence-detected entangled two-photon-absorption experiments: exploring the low-to-high-gain squeezing regimes", Proc. SPIE PC12863, Quantum Effects and Measurement Techniques in Biology and Biophotonics, PC128630B (13 March 2024); https://doi.org/10.1117/12.3003759
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KEYWORDS
Quantum regime
Imaging spectroscopy
Quantum entanglement
Quantum squeezing
Quantum experiments
Signal detection
Light absorption
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