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        <title>Frontiers in Quantum Science and Technology | Quantum Optics section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/quantum-science-and-technology/sections/quantum-optics</link>
        <description>RSS Feed for Quantum Optics section in the Frontiers in Quantum Science and Technology journal | New and Recent Articles</description>
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        <pubDate>2026-05-14T10:04:57.291+00:00</pubDate>
        <ttl>60</ttl>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2024.1438345</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2024.1438345</link>
        <title><![CDATA[Transportable optical cavity systems for terrestrial and space-borne portable optical atomic clocks]]></title>
        <pubdate>2024-12-16T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Rishabh Pal</author><author>Vikrant Yadav</author><author>Arijit Sharma</author>
        <description><![CDATA[High finesse optical cavities have been the backbone of realizing narrow linewidth lasers to drive coherent excitations on dipole-forbidden transitions in atoms and ions for applications in atomic frequency standards. Over the past decade, increasing efforts have been made to develop technologies that enable the operation of all-optical atomic clocks in a portable form factor outside laboratory environments relying on transportable high-finesse optical cavities for field applications in positioning, navigation, timing (PNT) and communication. However, the compactness of such systems makes them more susceptible to environmental noises that limit their performance and stability. This review aims to address the underlying physics behind high-finesse optical cavities, cavity-based laser frequency stabilization schemes and various sources of noise arising from thermal, vibrational, acoustic, power and polarization fluctuations that impede the stability of portable optical cavities, as well as outline the strategies for minimizing their influences. We also discuss about the minimization of the residual amplitude modulation (RAM) noise that degrades the laser linewidth. In addition, our study encompasses a comparative analysis of various transportable, high-finesse optical cavity systems that are currently accessible for terrestrial and space-based metrology applications, as well as an exploration of the potential applications that these cavities can facilitate. We also review recent advancements in designing such systems and highlight their efforts for constructing ultra-stable, compact, high-finesse cavities for terrestrial and space-borne transportable all-optical atomic clocks.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2024.1438340</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2024.1438340</link>
        <title><![CDATA[Single and entangled photon pair generation using atomic vapors for quantum communication applications]]></title>
        <pubdate>2024-10-22T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Sumit Achar</author><author>Abhijit Kundu</author><author>Ashok Chilukoti</author><author>Arijit Sharma</author>
        <description><![CDATA[Significant progress has been achieved in leveraging atomic systems for the effective operation of quantum networks, which are essential for secure and long-distance quantum communication protocols. The key elements of such networks are quantum nodes that can store or generate both single and entangled photon pairs. The primary mechanisms leading to the production of single and entangled photon pairs revolve around established techniques such as parametric down-conversion, four-wave mixing, and stimulated Raman scattering. In contrast to solid-state platforms, atomic platforms offer a more controlled approach to the generation of single and entangled photon pairs, owing to the progress made in atom manipulation techniques such as trapping, cooling, and precise excitation schemes facilitated by the use of lasers. This review article delves into the techniques implemented for generating single and entangled photon pairs in atomic platforms, starting with a detailed discussion of the fundamental concepts associated with single and entangled photons and their characterization techniques. The aim is to evaluate the strengths and limitations of these methodologies and offer insights into potential applications. Additionally, the article will review the extent to which these atomic-based systems have been integrated into operational quantum communication networks.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2024.1437933</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2024.1437933</link>
        <title><![CDATA[Slow light through Brillouin scattering in continuum quantum optomechanics]]></title>
        <pubdate>2024-07-29T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Hashem Zoubi</author><author>Klemens Hammerer</author>
        <description><![CDATA[This study investigates the possibility of achieving a slow signal field at the level of single photons inside nanofibers by exploiting stimulated Brillouin scattering, which involves a strong pump field and the vibrational modes of the waveguide. The slow signal is significantly amplified for a pump field, with a frequency higher than that of the signal and attenuated for a lower pump frequency. We introduce a configuration for obtaining a propagating slow signal without gain or loss and with a relatively wide bandwidth. This process involves two strong pump fields with frequencies both higher and lower than that of the signal where the effects of signal amplification and attenuation compensate each other. We account for thermal fluctuations due to the scattering of thermal phonons and identify conditions under which thermal contributions to the signal field are negligible. The slowing of light through Brillouin optomechanics may serve as a vital tool for optical quantum information processing and quantum communications within nanophotonic structures.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2024.1426216</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2024.1426216</link>
        <title><![CDATA[Quantum technologies with Rydberg atoms]]></title>
        <pubdate>2024-07-12T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Shovan Kanti Barik</author><author>Aishwarya Thakur</author><author>Yashica Jindal</author><author>Silpa B. S</author><author>Sanjukta Roy</author>
        <description><![CDATA[Rydberg atoms have highly controllable exotic properties such as strong inter-atomic interaction, high polarizability, and long lifetimes which enabled unprecedented progress in Rydberg atom-based quantum Technologies. We present a brief review of recent progress in the development of quantum technologies using Rydberg atoms. We highlight the recent advances in the various regimes of quantum technologies such as quantum Information processing, quantum sensing, quantum simulation of many-body physics and single-photon sources for quantum communications.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2024.1363409</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2024.1363409</link>
        <title><![CDATA[GINGERINO: a high sensitivity ring laser gyroscope for fundamental and quantum physics investigation]]></title>
        <pubdate>2024-02-28T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Francesco Giovinetti</author><author>Carlo Altucci</author><author>Francesco Bajardi</author><author>Andrea Basti</author><author>Nicolò Beverini</author><author>Salvatore Capozziello</author><author>Giorgio Carelli</author><author>Simone Castellano</author><author>Donatella Ciampini</author><author>Giuseppe Di Somma</author><author>Angela D. V. Di Virgilio</author><author>Francesco Fuso</author><author>Gaetano Lambiase</author><author>Enrico Maccioni</author><author>Paolo Marsili</author><author>Antonello Ortolan</author><author>Alberto Porzio</author><author>Raffaele Velotta</author>
        <description><![CDATA[Ring Laser Gyroscopes, based on the Sagnac effect, are currently the most sensitive rotation sensors. GINGERINO, a RLG installed underground, shows a proved sensitivity that enters the few frad/s regime in about 2.5 days of integration time. On one hand, this sensitivity is well below the shot–noise–level as predicted applying to GINGERINO the so called independent beam model. On the other hand, it paves the way to the use of RLG in fundamental and quantum physics research. Indeed, high sensitivity rotation measurement opens to test general relativity and alternative theory of gravity. Moreover, it make possible to study the interplay between quantum effects in the optical domain and non-inertial reference frames.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/frqst.2023.1294905</guid>
        <link>https://www.frontiersin.org/articles/10.3389/frqst.2023.1294905</link>
        <title><![CDATA[Quantum retrodiction in Gaussian systems and applications in optomechanics]]></title>
        <pubdate>2024-01-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Jonas Lammers</author><author>Klemens Hammerer</author>
        <description><![CDATA[What knowledge can be obtained from the record of a continuous measurement about the quantum state of the measured system at the beginning of the measurement? The task of quantum state retrodiction, the inverse of the more common state prediction, is rigorously addressed in quantum measurement theory through retrodictive positive operator-valued measures (POVMs). This introduction to this general framework presents its practical formulation for retrodicting Gaussian quantum states using continuous-time homodyne measurements and applies it to optomechanical systems. We identify and characterize achievable retrodictive POVMs in common optomechanical operating modes with resonant or off-resonant driving fields and specific choices of local oscillator frequencies in homodyne detection. In particular, we demonstrate the possibility of a near-ideal measurement of the quadrature of the mechanical oscillator, giving direct access to the position or momentum distribution of the oscillator at a given time. This forms the basis for complete quantum state tomography, albeit in a destructive manner.]]></description>
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