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Physica Scripta

Spectroscopy and quantum optics with ion traps

Richard Claude Thompson, Kishan Dholakia, J-L Hernandez-Pozos, G. Horváth, J. Rink, D. M. Segal

Published Jan 1, 1997• 3 citations
Publisher

Abstract

A review is given of the use of trapped atomic ions for spectroscopy and for quantum optics. The article discusses the principles of operation of the different types of traps, and their advantages for work in these fields, including the use of laser cooling of trapped ions. Aspects of laser cooling are demonstrated with the help of a numerical simulation program. Then the use of spectroscopic techniques to study the oscillation frequencies of trapped ions is discussed. Finally a number of different experiments illustrating the application of trapped ions to quantum optics are presented.

DOI
10.1088/0031-8949/1997/t72/003

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A review is given of the use of trapped atomic ions for spectroscopy and for quantum optics. The article discusses the principles of operation of the different types of traps, and their advantages for work in these fields, including the use of laser cooling of trapped ions. Aspects of laser cooling are demonstrated with the help of a numerical simulation program. Then the use of spectroscopic techniques to study the oscillation frequencies of trapped ions is discussed. Finally a number of different experiments illustrating the application of trapped ions to quantum optics are presented.
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New developments in spectroscopy and quantum optics with stored ions are summarized and discussed. Currently used ion trap devices are briefly described, and newly proposed cooling techniques are indicated. Recent results in precision spectroscopy are reviewed with particular emphasis on time and frequency standards. New applications of stored ions in the field of quantum optics are proposed such as the preparation of nonclassical states of motion in an ion trap. These can be detected by observation of the quantum collapse and revival phenomenon.
In an iontrap,laser-cooled ions can be confined in a small space in an ultra-high vacuum so that collisions rarely happen and the ions are well isolated from the environment. Since these conditions enable high-resolution spectroscopy of single ions, laser-cooled ions are suitable for use in developing frequency standards. The ions can be cooled to the motional ground state to give a well-defined initial quantum state for quantum state manipulation and quantum computing. In this review, principles of ion traps and laser cooling, and recent progress in optical frequency standards and quantum computing with trapped ions are described.
Ensembles of cold atomic and molecular ions in ion traps prepared at millikelvin temperatures by laser and sympathetic cooling have recently found considerable interest in both physics and chemistry. At very low temperatures the ions form ordered structures in the trap also known as "Coulomb crystals". Ion Coulomb crystals exhibit a range of intriguing properties which render them attractive systems for novel experiments in chemical dynamics, ultrahigh-resolution spectroscopy and quantum-information processing. In this article we review the methods used to prepare atomic and molecular ion Coulomb crystals and discuss some recent studies in mass spectrometry, low-temperature chemistry and precision spectroscopy to illustrate their scientific potential for chemical applications. Finally, we conclude with an outlook on outstanding challenges and prospective further developments in the field.
Ion traps and optical tweezers have emerged as highly promising technologies in the development of quantum computing, enabling precise control over qubits through electromagnetic and optical confinement. This paper explores the fundamental principles, advantages, and limitations of ion traps, including Paul and Penning configurations, and evaluates their role in modern quantum architectures. Particular emphasis is placed on coherence time, fidelity, and all-to-all connectivity, which make trapped ions a leading qubit candidate despite challenges in scalability and optical complexity. The work also examines optical tweezers, which use tightly focused laser beams to trap and manipulate ions and atoms with high precision, facilitating scalable arrays of qubits. Furthermore, hybrid traps that integrate optical tweezers with Paul traps are discussed as promising solutions to mitigate Radio-Frequency (RF) micromotion and enhance stability for cold ion–atom systems. Python-based simulations are presented to illustrate ion dynamics under Brownian motion, electric fields, and Gaussian laser traps, demonstrating how trap strength directly affects oscillation amplitude and confinement. Results confirm that stronger optical potentials reduce oscillation amplitude, while weaker traps lead to ion escape, aligning with theoretical predictions. Overall, this study highlights how the interplay of electromagnetic and optical techniques advances the frontier of quantum information science, with direct implications for computation, communication, and simulation.