Quantum Optics and Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1446

Special Issue Editors


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Guest Editor
Department of Engineering Technology, Middle Tennessee State University, 1301 E Main St., Murfreesboro, TN 37132, USA
Interests: digital holography; microscopy; X-ray laser
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Guest Editor
College of Mathematics and Science, Shanghai Normal University, Shanghai 200234, China
Interests: information optics; laser 3D imaging and image encryption

Special Issue Information

Dear Colleagues,

Quantum optics studies individual quanta of light. In this Special Issue, we call for research in the areas of quantum mechanics including entanglement and teleportation, quantum memory, and quantum information processing. Quantum imaging and quantum neural networks for learning-based image recognition are also of interest in this special issue. Quantum optical encryption, quantum nano-optics, and quantum optical information processing are particularly welcomed.

Quantum symmetry is also a topic of interest in this Special Issue, as well as group theory and symmetry of quantum electrodynamics. New insights connecting symmetry and quantum mechanics are especially welcomed.

Dr. Hongbo Zhang
Prof. Dr. Aimin Yan
Guest Editors

Manuscript Submission Information

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Keywords

  • quantum optics
  • quantum neural network
  • quantum optical information processing
  • quantum symmetry

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Published Papers (1 paper)

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Research

12 pages, 504 KiB  
Article
Phase Diffusion Mitigation in the Truncated Mach–Zehnder Interferometer
by Quan Liao, Hongmei Ma, Liqing Chen, Weiping Zhang and Chun-Hua Yuan
Symmetry 2024, 16(2), 187; https://doi.org/10.3390/sym16020187 - 5 Feb 2024
Viewed by 887
Abstract
The presence of phase diffusion noise may lead to the loss of quantum measurement advantages, resulting in measurement results that cannot beat the standard quantum limit (SQL). Squeezing is considered an effective method for reducing the detrimental effect of phase diffusion on a [...] Read more.
The presence of phase diffusion noise may lead to the loss of quantum measurement advantages, resulting in measurement results that cannot beat the standard quantum limit (SQL). Squeezing is considered an effective method for reducing the detrimental effect of phase diffusion on a measurement. Reasonable use of squeezing can make a measurement exceed the SQL. The Mach–Zehnder (MZ) interferometer has been exploited as a generic tool for precise phase measurement. Describing the reduction in quantum advantage caused by phase diffusion in an MZ interferometer that can be mitigated by squeezing is not easy to handle analytically because the input state changes from a pure state to a mixed state after experiencing the diffusion noise in the MZ interferometer. We introduce a truncated MZ interferometer, a symmetrical structure that can achieve the same potential phase sensitivity as the conventional MZ interferometer. This scheme can theoretically explain how phase diffusion reduces phase estimation and why squeezing counteracts the presence of phase diffusion. Using the Gaussian property of the input state and the characteristic of Gaussian operation in the squeezing, the two orthogonal field quantities of the quantum state are squeezed and anti-squeezed to different degrees, and the analytic results are obtained. This result can beat the SQL and provide reliable theoretical guidance for the experiment. The truncated MZ interferometer is more straightforward to build and operate than the conventional MZ interferometer. Moreover, it mitigates the phase diffusion noise via the squeezing operation, thus making it useful for applications in quantum metrology. Full article
(This article belongs to the Special Issue Quantum Optics and Symmetry)
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