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        <title>Frontiers in Photonics | Quantum Optics section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/photonics/sections/quantum-optics</link>
        <description>RSS Feed for Quantum Optics section in the Frontiers in Photonics journal | New and Recent Articles</description>
        <language>en-us</language>
        <generator>Frontiers Feed Generator,version:1</generator>
        <pubDate>2026-05-11T07:15:51.765+00:00</pubDate>
        <ttl>60</ttl>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2022.932944</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2022.932944</link>
        <title><![CDATA[A Hahn-Ramsey scheme for dynamical decoupling of single solid-state qubits]]></title>
        <pubdate>2022-11-29T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Nikola Sadzak</author><author>Alexander Carmele</author><author>Claudia Widmann</author><author>Christoph Nebel</author><author>Andreas Knorr</author><author>Oliver Benson</author>
        <description><![CDATA[Spin systems in solid state materials are promising qubit candidates for quantum information in particular as quantum memories or for quantum sensing. A major prerequisite here is the coherence of spin phase oscillations. In this work, we show a control sequence which, by applying RF pulses of variable detuning, allows to increase the visibility of spin phase oscillations. We experimentally demonstrate the scheme on single NV centers in diamond and analytically describe how the NV electron spin phase oscillations behave in the presence of classical noise models. We hereby introduce detuning as the enabling factor that modulates the filter function of the sequence, in order to achieve a visibility of the Ramsey fringes comparable to or longer than the Hahn-echo T2 time and an improved sensitivity to DC magnetic fields in various experimental settings.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2022.978855</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2022.978855</link>
        <title><![CDATA[Local photons]]></title>
        <pubdate>2022-09-15T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Daniel Hodgson</author><author>Jake Southall</author><author>Robert Purdy</author><author>Almut Beige</author>
        <description><![CDATA[The classical free-space solutions of Maxwell’s equations for light propagation in one dimension include wave packets of any shape that travel at the speed of light. This includes highly-localised wave packets that remain localised at all times. Motivated by this observation, this paper builds on recent work by Southall et al. [J. Mod. Opt. 68, 647 (2021)] and shows that a local description of the quantised electromagnetic field, which supports such solutions and which must overcome several no-go theorems, is indeed possible. Starting from the assumption that the basic building blocks of photonic wave packets are so-called bosons localised in position (blips), we identify the relevant Schrödinger equation and construct Lorentz-covariant electric and magnetic field observables. In addition we show that our approach simplifies to the standard description of quantum electrodynamics when restricted to a subspace of states.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2022.904651</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2022.904651</link>
        <title><![CDATA[Efficient Low Threshold Frequency Conversion in AlGaAs-On-Insulator Waveguides]]></title>
        <pubdate>2022-06-16T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Emil Z. Ulsig</author><author>Iterio Degli-Eredi</author><author>Eric J. Stanton</author><author>Nicolas Volet</author>
        <description><![CDATA[A design study is presented for an efficient, compact and robust device to convert the frequency of single-photons from the near-infrared to the telecom C-band. The material platform aluminum gallium arsenide (AlGaAs)-on-insulator, with its relatively large second-order nonlinearity, is used to create highly confined optical modes. This platform can feasibly incorporate single-photon emitters such as indium arsenide (InAs) on gallium arsenide (GaAs), paving the way towards direct integration of single-photon sources and nonlinear waveguides on the same chip. In this design study, single-pass difference-frequency generation (DFG) producing C-band single-photons is enabled via form birefringent phase-matching between a 930 nm single-photon pump and continuous wave (CW) idler at 2,325 nm. In particular the idler and single-photons are combined with an on-chip directional coupler, and then tapered to a single waveguide where the three modes are phase-matched. The design is studied at a special case, showing high fabrication tolerances, and an internal conversion efficiency up to 41%.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2022.886354</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2022.886354</link>
        <title><![CDATA[Superradiance of Spin Defects in Silicon Carbide for Maser Applications]]></title>
        <pubdate>2022-05-16T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Andreas Gottscholl</author><author>Maximilian Wagenhöfer</author><author>Manuel Klimmer</author><author>Selina Scherbel</author><author>Christian Kasper</author><author>Valentin Baianov</author><author>Georgy V. Astakhov</author><author>Vladimir Dyakonov</author><author>Andreas Sperlich</author>
        <description><![CDATA[Masers as telecommunication amplifiers have been known for decades, yet their application is strongly limited due to extreme operating conditions requiring vacuum techniques and cryogenic temperatures. Recently, a new generation of masers has been invented based on optically pumped spin states in pentacene and diamond. In this study, we pave the way for masers based on spin S = 3/2 silicon vacancy (VSi) defects in silicon carbide (SiC) to overcome the microwave generation threshold and discuss the advantages of this highly developed spin hosting material. To achieve population inversion, we optically pump the VSi into their mS = ±1/2 spin sub-states and additionally tune the Zeeman energy splitting by applying an external magnetic field. In this way, the prerequisites for stimulated emission by means of resonant microwaves in the 10 GHz range are fulfilled. On the way to realising a maser, we were able to systematically solve a series of subtasks that improved the underlying relevant physical parameters of the SiC samples. Among others, we investigated the pump efficiency as a function of the optical excitation wavelength and the angle between the magnetic field and the defect symmetry axis in order to boost the population inversion factor, a key figure of merit for the targeted microwave oscillator. Furthermore, we developed a high-Q sapphire microwave resonator (Q ≈ 104–105) with which we find superradiant stimulated microwave emission. In summary, SiC with optimized spin defect density and thus spin relaxation rates is well on its way of becoming a suitable maser gain material with wide-ranging applications.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2021.732748</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2021.732748</link>
        <title><![CDATA[Fiberized Diamond-Based Vector Magnetometers]]></title>
        <pubdate>2021-08-20T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Georgios Chatzidrosos</author><author>Joseph Shaji Rebeirro</author><author>Huijie Zheng</author><author>Muhib Omar</author><author>Andreas Brenneis</author><author>Felix M. Stürner</author><author>Tino Fuchs</author><author>Thomas Buck</author><author>Robert Rölver</author><author>Tim Schneemann</author><author>Peter Blümler</author><author>Dmitry Budker</author><author>Arne Wickenbrock</author>
        <description><![CDATA[We present two fiberized vector magnetic-field sensors, based on nitrogen-vacancy (NV) centers in diamond. The sensors feature sub-nT/Hz magnetic sensitivity. We use commercially available components to construct sensors with a small sensor size, high photon collection, and minimal sensor-sample distance. Both sensors are located at the end of optical fibres with the sensor-head freely accessible and robust under movement. These features make them ideal for mapping magnetic fields with high sensitivity and spatial resolution (≤ mm). As a demonstration we use one of the sensors to map the vector magnetic field inside the bore of a ≥100 mT Halbach array. The vector field sensing protocol translates microwave spectroscopy data addressing all diamonds axes and including double quantum transitions to a 3D magnetic field vector.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphot.2021.700737</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphot.2021.700737</link>
        <title><![CDATA[The Quantum Optics of Asymmetric Mirrors With Coherent Light Absorption]]></title>
        <pubdate>2021-07-12T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Benjamin Dawson</author><author>Nicholas Furtak-Wells</author><author>Thomas Mann</author><author>Gin Jose</author><author>Almut Beige</author>
        <description><![CDATA[The local observables of the quantised electromagnetic field near a mirror-coated interface depend strongly on the properties of the media on both sides. In macroscopic quantum electrodynamics, this fact is taken into account with the help of optical Green’s functions which correlate the position of an observer with all other spatial positions and photon frequencies. Here we present an alternative, more intuitive approach and obtain the local field observables with the help of a quantum mirror image detector method. In order to correctly normalise electric field operators, we demand that spontaneous atomic decay rates simplify to their respective free space values far away from the reflecting surface. Our approach is interesting, since mirror-coated interfaces constitute a common basic building block for quantum photonic devices.]]></description>
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