Two-dimensional fluorescence spectroscopy with quantum entangled photons: Idler-referenced timing without pump...

Area of Science:

• Quantum Optics
• Spectroscopy
• Nonlinear Optics

Background:

• Entangled photons are increasingly used for time-resolved spectroscopy.
• Previous methods required cumbersome pump-timing synchronization.
• Non-classical correlations offer unique spectroscopic capabilities.

Purpose of the Study:

• To theoretically examine an alternative protocol for time-resolved spectroscopy using entangled photons.
• To simplify experimental setups by eliminating the need for pump-timing.
• To enable easier realization of time-resolved two-dimensional fluorescence spectroscopy.

Main Methods:

• Theoretical examination of an idler-photon-referenced timing protocol.
• Analysis of entangled photons with negative or negligible frequency correlations.
• Evaluation of frequency-time degrees of freedom over the measurement timescale.

Main Results:

• The idler-referenced scheme effectively defines the time origin.
• Eliminating the pump-timing channel simplifies the optical layout.
• The scheme is effective for entangled photons with specific frequency correlation properties.

Conclusions:

• An idler-referenced timing protocol simplifies entangled photon spectroscopy.
• This simplification lowers the experimental barrier for time-resolved fluorescence spectroscopy.
• Careful matching of photon temporal characteristics to the experimental timescale is crucial for exploiting non-classical correlations.