Special Issue "Quantum Information Processing"

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

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editor

Dr. Nicolò Spagnolo
E-Mail Website
Guest Editor
Department of Physics, Sapienza University of Rome, 00185 Roma, Italy
Interests: quantum information; quantum simulation; quantum metrology; quantum computation; experimental quantum optics; quantum communication; quantum foundations

Special Issue Information

Dear Colleagues,

Quantum information is a growing research field with the aim of exploiting quantum systems to enhance information processing tasks. Indeed, the adoption of quantum resources promises to disclose strong advantages in several fields. Notable examples are communication tasks, the intrinsically secure transmission of information over long distances, improved sensitivity in the estimation of unknown parameters, the simulation of complex physical systems through quantum platforms, or quantum algorithms enabling enhanced performance in computational tasks.
These promises have led to growing research efforts both from a theoretical and an experimental point of view. On the one hand, great interest has been devoted to investigating and developing novel protocols that exploit quantum resources for enhanced information processing. On the other hand, significant advances have been made in the last few years to identify the most suitable platform for each task, as well as to push the technology towards handling progressively larger quantum systems. All these research efforts have contributed to establishing a worldwide growing community working in the field, which is progressively attracting researchers from other fields, disclosing novel platforms and approaches.

Dr. Nicolò Spagnolo
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 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 information
  • Quantum metrology
  • Quantum communication
  • Quantum computation
  • Quantum simulation
  • Quantum algorithms

Published Papers (3 papers)

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Research

Open AccessArticle
Unidimensional Continuous-Variable Quantum Key Distribution with Untrusted Detection under Realistic Conditions
Entropy 2019, 21(11), 1100; https://doi.org/10.3390/e21111100 - 11 Nov 2019
Abstract
A unidimensional continuous-variable quantum key distribution protocol with untrusted detection is proposed, where the two legitimate partners send unidimensional modulated or Gaussian-modulated coherent states to an untrusted third party, i.e., Charlie, to realize the measurement. Compared with the Gaussian-modulated coherent-state protocols, the unidimensional [...] Read more.
A unidimensional continuous-variable quantum key distribution protocol with untrusted detection is proposed, where the two legitimate partners send unidimensional modulated or Gaussian-modulated coherent states to an untrusted third party, i.e., Charlie, to realize the measurement. Compared with the Gaussian-modulated coherent-state protocols, the unidimensional modulated protocols take the advantage of easy modulation, low cost, and only a small number of random numbers required. Security analysis shows that the proposed protocol cannot just defend all detectors side channels, but also achieve great performance under certain conditions. Specifically, three cases are discussed in detail, including using unidimensional modulated coherent states in Alice’s side, in Bob’s side, and in both sides under realistic conditions, respectively. Under the three conditions, we derive the expressions of the secret key rate and give the optimal gain parameters. It is found that the optimal performance of the protocol is achieved by using unidimensional modulated coherent states in both Alice’s and Bob’s side. The resulting protocol shows the potential for long-distance secure communication using the unidimensional quantum key distribution protocol with simple modulation method and untrusted detection under realistic conditions. Full article
(This article belongs to the Special Issue Quantum Information Processing)
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Open AccessArticle
Bandwidth-Limited and Noisy Pulse Sequences for Single Qubit Operations in Semiconductor Spin Qubits
Entropy 2019, 21(11), 1042; https://doi.org/10.3390/e21111042 - 26 Oct 2019
Abstract
Spin qubits are very valuable and scalable candidates in the area of quantum computation and simulation applications. In the last decades, they have been deeply investigated from a theoretical point of view and realized on the scale of few devices in the laboratories. [...] Read more.
Spin qubits are very valuable and scalable candidates in the area of quantum computation and simulation applications. In the last decades, they have been deeply investigated from a theoretical point of view and realized on the scale of few devices in the laboratories. In semiconductors, spin qubits can be built confining the spin of electrons in electrostatically defined quantum dots. Through this approach, it is possible to create different implementations: single electron spin qubit, singlet–triplet spin qubit, or a three-electron architecture, e.g., the hybrid qubit. For each qubit type, we study the single qubit rotations along the principal axis of Bloch sphere including the mandatory non-idealities of the control signals that realize the gate operations. The realistic transient of the control signal pulses are obtained by adopting an appropriate low-pass filter function. In addition. the effect of disturbances on the input signals is taken into account by using a Gaussian noise model. Full article
(This article belongs to the Special Issue Quantum Information Processing)
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Open AccessArticle
Parameter Optimization Based BPNN of Atmosphere Continuous-Variable Quantum Key Distribution
Entropy 2019, 21(9), 908; https://doi.org/10.3390/e21090908 - 18 Sep 2019
Abstract
The goal of continuous variable quantum key distribution (CVQKD) is to be diffusely used and adopted in diverse scenarios, so the adhibition of atmospheric channel will play a crucial part in constituting global secure quantum communications. Atmospheric channel transmittance is affected by many [...] Read more.
The goal of continuous variable quantum key distribution (CVQKD) is to be diffusely used and adopted in diverse scenarios, so the adhibition of atmospheric channel will play a crucial part in constituting global secure quantum communications. Atmospheric channel transmittance is affected by many factors and does not vary linearly, leading to great changes in signal-to-noise ratio. It is crucial to choose the appropriate modulation variance under different turbulence intensities to acquire the optimal secret key rate. In this paper, the four-state protocol, back-propagation neural network (BPNN) algorithm was discussed in the proposed scheme. We employ BPNN to CVQKD, which could adjust the modulation variance to an optimum value for ensuring the system security and making the system performance optimal. The numerical results show that the proposed scheme is equipped to improve the secret key rate efficiently. Full article
(This article belongs to the Special Issue Quantum Information Processing)
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