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Optomechanical Systems for Fundamental Physics
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Optomechanical Systems for Fundamental Physics

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

Deadline for manuscript submissions: closed (10 October 2022) | Viewed by 7203

Special Issue Editors

Dr. Marko Toroš

E-Mail Website
Guest Editor
School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
Interests: levitated optomechanics; matter-wave interferometry; quantum optics; quantum measurement theory and its applications; decoherence theory; general relativity; infrared quantum gravity; quantum foundations
Dr. Antonio Pontin

E-Mail Website
Guest Editor
Department of Physics & Astronomy, Faculty of Maths & Physical Sciences, University College London, London WC1E 6BT, UK
Interests: quantum optics; optomechanics; optical levitation; gravitational wave detectors; micro and nanomechanical sensors
Dr. Alessio Belenchia

E-Mail Website
Guest Editor
Institut für Theoretische Physik, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany
Interests: quantum optomechanics; quantum thermodynamics; gravitational quantum physics; quantum gravity phenomenology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optomechanical systems represent an exceptional tool for sensing exquisitely weak effects, making them ideal for addressing numerous fundamental questions at the forefront of physics. The versatility of the light–matter interaction allows devising a wide spectrum of optomechanical devices, from atomic clouds and microscale sensors, to the large mirrors of LIGO, thus enabling tailored experiments to probe a vast range of physical phenomena, from the quantum-to-classical transition to gravitational wave physics.

Particularly interesting is the field of quantum optomechanics, where genuinely quantum features play a central role and the description of the system cannot be understood in purely classical terms. In this context, the coherent manipulation of the center-of-mass motion of massive resonators presents a series of opportunities to explore the foundations of physics in novel experimental regimes.  In the first instance, it paves the way toward the development of quantum sensors, where phase-sensitive schemes offer unprecedented sensitivities for the measurement of tiny signals, outperforming classical schemes. Secondly, by manipulating massive quantum systems, quantum optomechanics offers a path towards tests of the interface between quantum physics and gravity, a window on the quantum-to-classical transition, and an effective way to explore thermodynamics in the quantum regime—to name but a few applications.

This Special Edition aims to provide visibility to novel applications of optomechanical systems for fundamental applications, and it is open for submissions of unpublished, original research as well as comprehensive reviews on specific subfields.

Dr. Marko Toroš
Dr. Antonio Pontin
Dr. Alessio Belenchia
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

  • optomechanics
  • quantum foundations
  • classical and quantum sensors
  • quantum thermodynamics
  • quantum-to-classical transition
  • non-inertial and gravimetry sensing
  • gravitational quantum physics

Published Papers (4 papers)

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Research

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10 pages, 1571 KiB  
Article
Optomechanics-Based Quantum Estimation Theory for Collapse Models
by Marta Maria Marchese, Alessio Belenchia and Mauro Paternostro
Entropy 2023, 25(3), 500; https://0-doi-org.brum.beds.ac.uk/10.3390/e25030500 - 14 Mar 2023
Cited by 3 | Viewed by 1019
Abstract
We make use of the powerful formalism of quantum parameter estimation to assess the characteristic rates of a continuous spontaneous localization (CSL) model affecting the motion of a massive mechanical system. We show that a study performed in non-equilibrium conditions unveils the advantages [...] Read more.
We make use of the powerful formalism of quantum parameter estimation to assess the characteristic rates of a continuous spontaneous localization (CSL) model affecting the motion of a massive mechanical system. We show that a study performed in non-equilibrium conditions unveils the advantages provided by the use of genuinely quantum resources—such as quantum correlations—in estimating the CSL-induced diffusion rate. In stationary conditions, instead, the gap between quantum performance and a classical scheme disappears. Our investigation contributes to the ongoing effort aimed at identifying suitable conditions for the experimental assessment of collapse models. Full article
(This article belongs to the Special Issue Optomechanical Systems for Fundamental Physics)
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10 pages, 380 KiB  
Article
Entanglement Witness for the Weak Equivalence Principle
by Sougato Bose, Anupam Mazumdar, Martine Schut and Marko Toroš
Entropy 2023, 25(3), 448; https://0-doi-org.brum.beds.ac.uk/10.3390/e25030448 - 03 Mar 2023
Cited by 16 | Viewed by 1980
Abstract
The Einstein equivalence principle is based on the equality of gravitational and inertial mass, which has led to the universality of a free-fall concept. The principle has been extremely well tested so far and has been tested with a great precision. However, all [...] Read more.
The Einstein equivalence principle is based on the equality of gravitational and inertial mass, which has led to the universality of a free-fall concept. The principle has been extremely well tested so far and has been tested with a great precision. However, all these tests and the corresponding arguments are based on a classical setup where the notion of position and velocity of the mass is associated with a classical value as opposed to the quantum entities.Here, we provide a simple quantum protocol based on creating large spatial superposition states in a laboratory to test the quantum regime of the equivalence principle where both matter and gravity are treated at par as a quantum entity. The two gravitational masses of the two spatial superpositions source the gravitational potential for each other. We argue that such a quantum protocol is unique with regard to testing especially the generalisation of the weak equivalence principle by constraining the equality of gravitational and inertial mass via witnessing quantum entanglement. Full article
(This article belongs to the Special Issue Optomechanical Systems for Fundamental Physics)
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12 pages, 1245 KiB  
Article
Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback
by Zhenhua Wu, Zhen Yi, Wenju Gu, Lihui Sun and Zbigniew Ficek
Entropy 2022, 24(12), 1741; https://doi.org/10.3390/e24121741 - 29 Nov 2022
Viewed by 1260
Abstract
A coherent feedback scheme is used to enhance the degree of squeezing of the output field in a cavity optomechanical system. In the feedback loop, a beam splitter (BS) plays the roles of both a feedback controller and an input–output port. To realize [...] Read more.
A coherent feedback scheme is used to enhance the degree of squeezing of the output field in a cavity optomechanical system. In the feedback loop, a beam splitter (BS) plays the roles of both a feedback controller and an input–output port. To realize effective enhancement, the output quadrature should take the same form as the input quadrature, and the system should operate at the deamplification situation in the meantime. This can be realized by choosing an appropriate frequency-dependent phase angle for the generalized quadrature. Additionally, both the transmissivity of the BS and the phase factor induced by time delays in the loop affect optical squeezing. For the fixed frequency, the optimal values of transmissivity and phase factor can be used to achieve the enhanced optical squeezing. The effect of optical losses on squeezing is also discussed. Optical squeezing is degraded by the introduced vacuum noise owing to the inefficient transmission in the loop. We show that the enhancement of squeezing is achievable with the parameters of the current experiments. Full article
(This article belongs to the Special Issue Optomechanical Systems for Fundamental Physics)
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Review

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14 pages, 505 KiB  
Review
Levitated Micromagnets in Superconducting Traps: A New Platform for Tabletop Fundamental Physics Experiments
by Andrea Vinante, Chris Timberlake and Hendrik Ulbricht
Entropy 2022, 24(11), 1642; https://0-doi-org.brum.beds.ac.uk/10.3390/e24111642 - 11 Nov 2022
Cited by 4 | Viewed by 1862
Abstract
Magnetically levitated microparticles have been proposed as mechanical sensors with extreme sensitivity. In particular, micromagnets levitated above a superconductor can achieve very low levels of dissipation and thermal noise. In this paper, we review recent initial experiments and discuss the potential for using [...] Read more.
Magnetically levitated microparticles have been proposed as mechanical sensors with extreme sensitivity. In particular, micromagnets levitated above a superconductor can achieve very low levels of dissipation and thermal noise. In this paper, we review recent initial experiments and discuss the potential for using these systems as sensors of magnetic fields and rotational motion, as well as possible applications to fundamental physics. Full article
(This article belongs to the Special Issue Optomechanical Systems for Fundamental Physics)
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