Conditional quantum plasmonic sensing

Area of Science:

• Quantum optics
• Plasmonics
• Nanophotonics

Background:

• Quantum photonic sensing aims to detect delicate samples using weak optical signals.
• Quantum plasmonic sensors leverage nanoscale electromagnetic confinement via surface plasmon polaritons for high sensitivity.
• Current plasmonic sensors are limited by quantum statistical fluctuations and inherent losses, hindering sensitivity beyond the shot-noise limit.

Purpose of the Study:

• To introduce a novel protocol for quantum plasmonic sensing.
• To overcome the limitations imposed by quantum fluctuations and losses in plasmonic sensing.
• To enhance the signal-to-noise ratio in sensors utilizing weak plasmonic signals.

Main Methods:

• Development of a quantum plasmonic sensing protocol based on conditional detection of plasmons.
• Implementation of plasmon subtraction as a technique to control quantum fluctuations.
• Characterization of plasmonic fields and their statistical fluctuations.

Main Results:

• Demonstration that conditional detection of plasmonic fields via plasmon subtraction offers control over quantum fluctuations.
• Significant improvement in the signal-to-noise ratio for photonic sensors relying on plasmonic signals.
• Enabling the use of weak plasmonic signals for sensing delicate samples without compromising sample integrity.

Conclusions:

• Conditional plasmon detection provides a new pathway to enhance quantum plasmonic sensing.
• The developed protocol offers a method to surpass the shot-noise limit in plasmonic sensing.
• This advancement has significant implications for sensitive molecule sensing and chemical detection applications.