Background cancellation for frequency-selective quantum sensing

TL;DR

This paper introduces a passive quantum sensor that uses entanglement and time-independent interactions to selectively detect specific frequency signals, simplifying control and data processing in quantum sensing.

Contribution

It presents a novel quantum sensing method that encodes frequency selectivity and thresholding directly into the sensor's dynamics, avoiding complex control schemes.

Findings

Sensor responds only to target frequency above a threshold

Reduces need for complex dynamical control

Simplifies post-processing in quantum sensing

Abstract

A key challenge in quantum sensing is the detection of weak time dependent signals, particularly those that arise as specific frequency perturbations over a background field. Conventional methods usually demand complex dynamical control of the quantum sensor and heavy classical post-processing. We propose a quantum sensor that leverages time independent interactions and entanglement to function as a passive, tunable, thresholded frequency filter. By encoding the frequency selectivity and thresholding behavior directly into the dynamics, the sensor is responsive only to a target frequency of choice whose amplitude is above a threshold. This approach circumvents the need for complex control schemes and reduces the post-processing overhead.