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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Enhancing Entangled Two-Photon Absorption for Picosecond Quantum Spectroscopy.

Ryan K Burdick¹, George C Schatz², Theodore Goodson¹

¹Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States.

Journal of the American Chemical Society

|October 6, 2021

Summary

This summary is machine-generated.

Entangled two-photon absorption (ETPA) can be enhanced using spectral-spatial coupling. This allows for more efficient nonlinear optical measurements and photochemical control at the picosecond scale.

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Area of Science:

Quantum optics
Nonlinear spectroscopy
Photochemistry

Background:

Entangled two-photon absorption (ETPA) offers reduced phototoxicity due to low light intensity.
Previous studies predicted ETPA cross-section inversely proportional to entanglement area and time (σe ∝ 1/AeTe).
This relationship limited ETPA to femtosecond timescales, leaving picosecond applications unexplored.

Purpose of the Study:

Investigate the role of spectral-spatial coupling in ETPA cross-section.
Explore ETPA applications at picosecond timescales.
Enhance ETPA efficiency by utilizing narrowband entangled photons.

Main Methods:

Experimental measurement of ETPA cross-section for zinc tetraphenylporphyrin.
Varying the spontaneous parametric down-conversion (SPDC) bandwidth (σf) to alter spectral-spatial coupling.
Theoretical analysis of experimental data.

Main Results:

Spectral-spatial coupling significantly impacts σe for entanglement times > 100 fs.
For type-I ETPA, σe increases as SPDC bandwidth (σf) decreases, peaking at σf = 0.1 ps⁻¹ (Te = 10 ps).
At peak, type-I ETPA cross-section is 1 order larger than fs-scale ETPA and 3 orders larger than predicted for ps-scale ETPA.

Conclusions:

Narrowband type-I ETPA, leveraging spectral-spatial coupling, overcomes previous limitations.
This approach enables efficient nonlinear optical signal measurement with picosecond temporal precision.
Offers new possibilities for controlling photochemical reactions requiring ps temporal resolution.