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Photoniques

Quantum sensors and their limits

Mathieu L. Juan

Published Jan 1, 2025• 0 citations
Publisher

Abstract

A fundamental aspect of quantum systems lies in their extreme sensitivity to external perturbations. This characteristic, which generally represents a considerable challenge for physicists seeking to isolate these systems in order to observe their quantum properties, can actually be transformed into an advantage. Indeed, this intrinsic sensitivity makes quantum systems ideal candidates for high-precision metrology. Quantum sensors exploit this susceptibility to measure physical quantities with precision difficult to match with classical approaches.

DOI
10.1051/photon/202513468

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A fundamental aspect of quantum systems lies in their extreme sensitivity to external perturbations. This characteristic, which generally represents a considerable challenge for physicists seeking to isolate these systems in order to observe their quantum properties, can actually be transformed into an advantage. Indeed, this intrinsic sensitivity makes quantum systems ideal candidates for high-precision metrology. Quantum sensors exploit this susceptibility to measure physical quantities with precision difficult to match with classical approaches.
This paper explores the potential of quantum sensors for achieving quantum precision measurement. The core claim is that leveraging the inherent properties of quantum sensors, specifically quantum effects like tunneling and entanglement, can enable significantly more accurate measurements of physical quantities compared to classical techniques. This work outlines the fundamental principles and theoretical frameworks underpinning this approach, focusing on the mechanisms by which quantum sensors achieve this enhanced precision. We examine various quantum sensor modalities, including SQUID magnetometers, atomic clocks, and NV centers, and discuss the challenges and future directions in this burgeoning field. The primary objective is to demonstrate how quantum measurement, exploiting the principles of quantum mechanics, can surpass the limitations imposed by classical measurement methodologies. The discussion includes a review of relevant theoretical concepts and a conceptual framework for understanding the relationship between sensor design, quantum effects, and measurement precision. Ultimately, this paper aims to provide a foundational understanding of the transformative potential of quantum sensing for precision measurement applications.
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Quantum Mechanics has revolutionized not only our understanding of Nature but also, being the foundation of electronics and lasers, virtually all the instruments we use every day. Then again, we have not yet been able to harness the consequences of the most profoundly quantum phenomena such as state superpositions and particle entanglement. The Second Quantum Revolution has the ambition of building novel "quantum machines" able to fully exploit the properties of both microscopic and macroscopic quantum states. Quantum sensors, making use of the phenomenon of entanglement in systems promise to reach the fundamental measurement limits determined by the laws of physics and correspondingly improve the current performance of the sensors by orders of magnitude in terms of precision and accuracy, with important application implications in the scientific, industrial, and commercial fields. They can measure with unprecedented precision a wide class of physical quantities, such as magnetic, electric, and inertial fields, times, frequencies, temperatures and pressures.
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This paper explores the potential of quantum sensors for achieving unprecedented levels of precision in time measurement. The core concept leverages the inherent sensitivity of quantum systems to external perturbations, particularly quantum entanglement and coherence, to directly measure the passage of time. Traditional timekeeping methods rely on periodic phenomena like atomic oscillations, which introduce systematic errors and limitations. Quantum sensors, however, offer a fundamentally different approach, promising a shift towards a measurement paradigm where time itself is directly sensed. This work details a theoretical framework for such a system, outlining key components, potential challenges, and the anticipated improvements in accuracy compared to existing technologies. We propose a system utilizing a macroscopic quantum clock, exploiting the precisely controlled evolution of quantum superposition states to determine time intervals with potentially sub-picosecond resolution. The design emphasizes the minimization of decoherence effects—a critical factor in realizing the full potential of quantum time measurement—and introduces novel strategies for signal processing and calibration. This research contributes to the emerging field of quantum metrology and lays the groundwork for future advancements in high-precision timekeeping and fundamental physics research. ---