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arXiv:2405.14910

A Short Introduction to Basic Principles of Quantum Navigation Based-on Rb Cold Atom Interferometry

Narges Kafaei, Ali Motazedifard

Published May 23, 2024• 1 citation
arXivHTMLPDF

Abstract

Due to advances in cold atom interferometry, laser spectroscopy it is possible to achieve more precise accelerometers and gyroscopes which never occurs in mechanical- and optical-based sensors. Because of the inherent and independent characteristics of atomic levels which are too sensitive respect to the external changes, a self-calibrated navigation system with no satellite can be achieved. Here, in this paper we very shortly review the basic principles of inertia cold atom navigation sensor.

DOI
10.48550/arxiv.2405.14910

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Due to advances in cold atom interferometry, laser spectroscopy it is possible to achieve more precise accelerometers and gyroscopes which never occurs in mechanical- and optical-based sensors. Because of the inherent and independent characteristics of atomic levels which are too sensitive respect to the external changes, a self-calibrated navigation system with no satellite can be achieved. Here, in this paper we very shortly review the basic principles of inertia cold atom navigation sensor.
The growing reliance on Global Positioning System (GPS) technologies across critical sectors such as defense, aerospace, and autonomous systems highlights the need for navigation solutions that are robust against signal loss, spoofing, and jamming. Quantum-based navigation systems offer a promising alternative, leveraging the fundamental principles of quantum mechanics to achieve unprecedented precision and resilience. This paper provides an overview of the core quantum technologies enabling this next generation of navigation, including atomic interferometry, quantum accelerometers, gyroscopes, and ultra-precise quantum clocks. Cold atom techniques and laser cooling play pivotal roles in enhancing measurement stability and accuracy. The integration of these technologies into inertial navigation systems (INS) significantly reduces drift and extends operational reliability in GPS-denied environments. Quantum navigation technologies are finding applications across a wide range of domains, including military defense, underwater missions, space travel, and autonomous transportation. Despite existing obstacles such as high development costs, environmental sensitivity, and the need for further miniaturization, progress in quantum sensor development and engineering continues at a steady pace. This article presents an overview of the fundamental concepts, present capabilities, and prospective advancements in quantum navigation. It also highlights the technology's promise as a viable alternative or even a possible replacement for conventional GPS systems.
In recent years, quantum technology has attracted attention in inertial navigation, especially due to its extreme sensitivity to inertial forces and strong immunity to drifts, which plague conventional sensors. There are multiple groups around the world working on cold atom interferometry aiming to develop high sensitive inertial sensors for very high accuracy autonomous navigation. Recent advancements in micro-fabrication technologies have helped in development of robust and miniaturized atom interferometry based high performance inertial systems. These, in future, will pave way for autonomous satellite inertial navigation sensors based on cold atoms. Here we discuss the achievements towards realizing cold atom inertial sensors and their indomitable role as inertial sensors for future satellites. A detailed survey on the initiatives taken by different space agencies, their achievements and their plans to explore its potential in space are also discussed.
Inertial sensors based on cold atom interferometry exhibit many interesting features for applications related to inertial navigation, particularly in terms of sensitivity and long-term stability. However, at present the typical atom interferometer is still very much an experiment—consisting of a bulky, static apparatus with a limited dynamic range and high sensitivity to environmental effects. To be compliant with mobile applications further development is needed. In this work, we present a compact and mobile experiment, which we recently used to achieve the first inertial measurements with an atomic accelerometer onboard an aircraft. By integrating classical inertial sensors into our apparatus, we are able to operate the atomic sensor well beyond its standard operating range, corresponding to half of an interference fringe. We report atom-based acceleration measurements along both the horizontal and vertical axes of the aircraft with one-shot sensitivities of 2.3 × 10−4 g over a range of ∼ 0.1 g. The same technology can be used to develop cold-atom gyroscopes, which could surpass the best optical gyroscopes in terms of long-term sensitivity. Our apparatus was also designed to study multi-axis atom interferometry with the goal of realizing a full inertial measurement unit comprised of the three axes of acceleration and rotation. Finally, we present a compact and tunable laser system, which constitutes an essential part of any cold-atom-based sensor. The architecture of the laser is based on phase modulating a single fiber-optic laser diode, and can be tuned over a range of 1 GHz in less than 200 μs.
Quantum sensors based on atom interferometers can provide measurements of inertial quantities with unprecedented accuracy and precision. It has been suggested that this sea change in sensing could provide an inertial navigation capability that is comparable with current satellite based navigation systems. However, the accuracy of sensor measurements is not the only factor that limits the accuracy of inertial navigation systems. In this paper, we explore the fundamental limits to inertial navigation, and explain how quantum inertial sensors could be used to alleviate some of the problems encountered in current classical inertial navigation systems, but not to solve the fundamental instability inherent in inertial navigation methods.
This report describes the physical principles underpinning cold atom interferometry (CAI) and shows how they can be leveraged to develop high-performance inertial and gravity sensors; the distinguishing properties and the maturity level of such sensors will also be assessed. \nProof-of-principles demonstrations have been made for CAI-based accelerometers and gyroscopes, which can enable long-term autonomous navigation and precise positioning for ships, submarines, and satellites. CAI-based gravimeters and gravity gradiometers have been developed and are being tested on the ground; satellite-based systems could in the future be used to monitor the Earth gravity field. This would allow a better understanding of several geophysical and climate phenomena which require long-term policies solidly supported by data. \nQuantum sensors based on cold atom interferometry may therefore impact existing and future EU programmes on space, defence, and Earth observation. This report provides background knowledge of the field to a non-specialist audience, and in particular to EU policymakers involved in technology support and potential applications.