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Entropy
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Lectures on Recent Experimental Achievements in Quantum-Enhanced Technologies
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Lectures on Recent Experimental Achievements in Quantum-Enhanced Technologies

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

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 5514

Special Issue Editors

Prof. Dr. Valentina Parigi

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Guest Editor
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France, 4 Place Jussieu, F-75252 Paris, France
Interests: quantum complex networks; continuous variables; quantum information; multimode quantum optics; non-Gaussian quantum states; foundations of quantum mechanics
Prof. Dr. Fabio Sciarrino

E-Mail Website
Guest Editor
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
Interests: integrated quantum photonics; quantum metrology; photonics quantum information processing; foundations of quantum mechanics; quantum machine learning
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Rosario Lo Franco

E-Mail Website
Guest Editor
Dipartimento di Ingegneria, Università degli Studi di Palermo, ​Viale delle Scienze, Edificio 6, 90128 Palermo, Italy
Interests: quantum correlations; entanglement; open quantum systems; quantum information; foundations of quantum mechanics; identical quantum particles
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since the idea of exploiting quantum computation to simulate quantum systems was first formulated by Feynman in his 1982 publication, Simulating Physics with Computers, the scientific community has been going through striking developments towards achieving that goal. Thanks to theoretical and technological progress, quantum information protocols have been implemented in many experimental platforms using different types of quantum building blocks in a noisy intermediate-scale regime. The race to build fully efficient and large-scale quantum technologies remains challenging and requires precise control of quantum resources within the composite systems, mitigation of environmental noise, and quantum error correction codes.

Nonetheless, impressive results have been achieved in laboratories to prove that the performance of tasks such as computation, communication, information processing, secure key distribution, complex system simulation or sensing, can outperform classical procedures due to suitable utilization of quantum features. Quantum advantage has thus become a reality.

This Special Issue will gather concise yet informative reviews from the laboratories around the world concerning the most recent experimental achievements and breakthroughs in the quantum technology scenario. This will ultimately serve as a useful, easy-to-read compendium of state-of-art setups and techniques for implementing quantum-enhanced tasks.

Prof. Dr. Valentina Parigi
Prof. Dr. Fabio Sciarrino
Dr. Rosario Lo Franco
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

  • quantum technology
  • quantum optics
  • quantum simulation
  • noisy intermediate state quantum devices
  • quantum computer
  • quantum communications
  • integrated quantum photonics
  • logic quantum gates
  • circuit QED
  • trapped ions
  • quantum metrology
  • quantum error correction

Published Papers (2 papers)

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Research

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14 pages, 4647 KiB  
Article
Low Noise Opto-Electro-Mechanical Modulator for RF-to-Optical Transduction in Quantum Communications
by Michele Bonaldi, Antonio Borrielli, Giovanni Di Giuseppe, Nicola Malossi, Bruno Morana, Riccardo Natali, Paolo Piergentili, Pasqualina Maria Sarro, Enrico Serra and David Vitali
Entropy 2023, 25(7), 1087; https://doi.org/10.3390/e25071087 - 19 Jul 2023
Cited by 1 | Viewed by 1207
Abstract
In this work, we present an Opto-Electro-Mechanical Modulator (OEMM) for RF-to-optical transduction realized via an ultra-coherent nanomembrane resonator capacitively coupled to an rf injection circuit made of a microfabricated read-out able to improve the electro-optomechanical interaction. This device configuration can be embedded in [...] Read more.
In this work, we present an Opto-Electro-Mechanical Modulator (OEMM) for RF-to-optical transduction realized via an ultra-coherent nanomembrane resonator capacitively coupled to an rf injection circuit made of a microfabricated read-out able to improve the electro-optomechanical interaction. This device configuration can be embedded in a Fabry–Perot cavity for electromagnetic cooling of the LC circuit in a dilution refrigerator exploiting the opto-electro-mechanical interaction. To this aim, an optically measured steady-state frequency shift of 380 Hz was seen with a polarization voltage of 30 V and a Q-factor of the assembled device above 106 at room temperature. The rf-sputtered titanium nitride layer can be made superconductive to develop efficient quantum transducers. Full article
(This article belongs to the Special Issue Lectures on Recent Experimental Achievements in Quantum-Enhanced Technologies)
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Review

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16 pages, 5950 KiB  
Review
Beating Standard Quantum Limit with Weak Measurement
by Geng Chen, Peng Yin, Wen-Hao Zhang, Gong-Chu Li, Chuan-Feng Li and Guang-Can Guo
Entropy 2021, 23(3), 354; https://doi.org/10.3390/e23030354 - 16 Mar 2021
Cited by 11 | Viewed by 2981
Abstract
Weak measurements have been under intensive investigation in both experiment and theory. Numerous experiments have indicated that the amplified meter shift is produced by the post-selection, yielding an improved precision compared to conventional methods. However, this amplification effect comes at the cost of [...] Read more.
Weak measurements have been under intensive investigation in both experiment and theory. Numerous experiments have indicated that the amplified meter shift is produced by the post-selection, yielding an improved precision compared to conventional methods. However, this amplification effect comes at the cost of a reduced rate of acquiring data, which leads to an increasing uncertainty to determine the level of meter shift. From this point of view, a number of theoretical works have suggested that weak measurements cannot improve the precision, or even damage the metrology information due to the post-selection. In this review, we give a comprehensive analysis of the weak measurements to justify their positive effect on prompting measurement precision. As a further step, we introduce two modified weak measurement protocols to boost the precision beyond the standard quantum limit. Compared to previous works beating the standard quantum limit, these protocols are free of using entangled or squeezed states. The achieved precision outperforms that of the conventional method by two orders of magnitude and attains a practical Heisenberg scaling up to n=106 photons. Full article
(This article belongs to the Special Issue Lectures on Recent Experimental Achievements in Quantum-Enhanced Technologies)
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