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Entropy
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Quantum Computing with Trapped Ions
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Quantum Computing with Trapped Ions

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: 15 September 2025 | Viewed by 2325

Special Issue Editors

Dr. Susan M. Clark

E-Mail Website
Guest Editor
Sandia National Laboratories, Albuquerque, NM 87123, USA
Interests: trapped ions; quantum computing; quantum architectures; light-matter interactions
Dr. Phil Richerme

E-Mail Website
Guest Editor
Department of Physics, Indiana University, Bloomington, IN 47405, USA
Interests: quantum physics; quantum mechanics; quantum computing; atomic physics; quantum simulation; trapped ions

Special Issue Information

Dear Colleagues,

Trapped ions are a unique platform for quantum computing and simulation. They boast all-to-all connectivity, reconfigurability via shuttling, full- and partial-entangling operations mediated via phonons and straightforward individual control and readout. However, efforts to standardize quantum computing across different hardware platforms have left many of these unique features either unexplored or unleveraged to their full potential. 

This Special Issue aims to highlight how harnessing characteristics unique to ions can result in quantum system performance improvements, new quantum technologies, or new approaches to quantum simulation. Contributions relating to unique gate implementations, shuttling, noise mitigation, modeling of noise sources other than depolarizing noise, and efficient device calibration are especially encouraged. In addition, contributions which discuss couplings to degrees of freedom beyond the standard two-level qubit, such as virtual qubits, qudits, or metastable states, are also strongly encouraged. Finally, we also invite submissions utilizing bosonic degrees of freedom within trapped ion systems, with applications to studying both coherent and open-system quantum dynamics.

Dr. Susan M. Clark
Dr. Phil Richerme
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ion
  • quantum computing
  • quantum simulation
  • gate implementations
  • shuttling
  • noise mitigation
  • calibration
  • qudits
  • metastable states
  • bosonic degrees of freedom
  • open-system quantum dynamics
  • coherent operations

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Published Papers (3 papers)

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Research

13 pages, 2121 KiB  
Article
Structural Transitions and Melting of Two-Dimensional Ion Crystals in RF Traps
by Boris V. Pashinsky, Alexander Kato and Boris B. Blinov
Entropy 2025, 27(4), 325; https://doi.org/10.3390/e27040325 - 21 Mar 2025
Viewed by 369
Abstract
We investigate the structural properties and melting behaviors of two-dimensional ion crystals in an RF trap, focusing on the effects of ion temperature and trap potential symmetry. We identify distinct crystal structures that form under varying trapping conditions and temperatures through experimental observations [...] Read more.
We investigate the structural properties and melting behaviors of two-dimensional ion crystals in an RF trap, focusing on the effects of ion temperature and trap potential symmetry. We identify distinct crystal structures that form under varying trapping conditions and temperatures through experimental observations and theoretical analyses. As the temperature increases or the trap potential becomes more symmetric, we observe a transition from a lattice arrangement to elongated ring-like formations aligned along the trap axes. Our experimental and theoretical efforts enhance our understanding of phase transitions in low-dimensional, confined systems, offering insights into the controlled formation of quantum crystals for applications in quantum simulations and many-body physics. Full article
(This article belongs to the Special Issue Quantum Computing with Trapped Ions)
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7 pages, 550 KiB  
Article
Internal State Cooling of an Atom with Thermal Light
by Amanda Younes, Randall Putnam, Paul Hamilton and Wesley C. Campbell
Entropy 2025, 27(3), 222; https://doi.org/10.3390/e27030222 - 21 Feb 2025
Viewed by 467
Abstract
A near-minimal instance of optical cooling is experimentally presented, wherein the internal-state entropy of a single atom is reduced more than twofold by illuminating it with broadband, incoherent light. Since the rate of optical pumping by a thermal state increases monotonically with its [...] Read more.
A near-minimal instance of optical cooling is experimentally presented, wherein the internal-state entropy of a single atom is reduced more than twofold by illuminating it with broadband, incoherent light. Since the rate of optical pumping by a thermal state increases monotonically with its temperature, the cooling power in this scenario increases with higher thermal occupation, an example of a phenomenon known as cooling by heating. In contrast to optical pumping using coherent, narrow-band laser light, here, we perform the same task with fiber-coupled, broadband sunlight, the brightest laboratory-accessible source of continuous blackbody radiation. Full article
(This article belongs to the Special Issue Quantum Computing with Trapped Ions)
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20 pages, 549 KiB  
Article
Transpiling Quantum Assembly Language Circuits to a Qudit Form
by Denis A. Drozhzhin, Anastasiia S. Nikolaeva, Evgeniy O. Kiktenko and Aleksey K. Fedorov
Entropy 2024, 26(12), 1129; https://doi.org/10.3390/e26121129 - 23 Dec 2024
Viewed by 848
Abstract
In this paper, we introduce the workflow for converting qubit circuits represented by Open Quantum Assembly format (OpenQASM, also known as QASM) into the qudit form for execution on qudit hardware and provide a method for translating qudit experiment results back into qubit [...] Read more.
In this paper, we introduce the workflow for converting qubit circuits represented by Open Quantum Assembly format (OpenQASM, also known as QASM) into the qudit form for execution on qudit hardware and provide a method for translating qudit experiment results back into qubit results. We present the comparison of several qudit transpilation regimes, which differ in decomposition of multicontrolled gates: qubit as ordinary qubit transpilation and execution, qutrit with d=3 levels and single qubit in qudit, and ququart with d=4 levels and 2 qubits per ququart. We provide several examples of transpiling circuits for trapped ion qudit processors, which demonstrate potential advantages of qudits. Full article
(This article belongs to the Special Issue Quantum Computing with Trapped Ions)
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