Advanced quantum technologies最新文献

{"title":"Quantum Parameter Estimation of Optomagnonic Coupling","authors":"Chengsong Zhao,&nbsp;Huan-Jia Li,&nbsp;Ning Zheng,&nbsp;Jia-xin Peng,&nbsp;Ling Zhou","doi":"10.1002/qute.70384","DOIUrl":"https://doi.org/10.1002/qute.70384","url":null,"abstract":"<div>\u0000 \u0000 <p>Optomagnonic interactions bridge microwave-frequency magnons and optical-frequency photons and are important for hybrid quantum technologies. Precise calibration of the optomagnonic coupling strength is therefore essential, especially in the weak-coupling regime. We propose a high-precision estimation scheme for hertz-to-kilohertz optomagnonic coupling strengths based on homodyne detection of measurable output temporal modes under realistic experimental constraints. Using quantum Fisher information (QFI), we identify optimal operating regimes and show that joint local optical homodyne detection can nearly saturate the intracavity QFI over a broad parameter range. By constructing finite-duration output temporal modes, we further demonstrate that the Fisher information can be efficiently extracted from accessible optical outputs. Finally, numerical simulations of the measurement process verify the estimation workflow and its robustness against parameter uncertainties.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing Phase Estimation in an SU(1,1) Interferometer via Kerr Nonlinearity and Photon Addition","authors":"Lifen Guo,&nbsp;Qingqian Kang,&nbsp;Zekun Zhao,&nbsp;Jifeng Sun,&nbsp;Shoukang Chang,&nbsp;Qisi Zhou,&nbsp;Teng Zhao,&nbsp;Cunjin Liu,&nbsp;Xin Su,&nbsp;Liyun Hu","doi":"10.1002/qute.70392","DOIUrl":"https://doi.org/10.1002/qute.70392","url":null,"abstract":"<div>\u0000 \u0000 <p>We enhance phase sensitivity in an SU(1,1) interferometer by combining a Kerr nonlinear phase shifter with multi-photon addition. Using coherent and vacuum states as inputs, we analyze phase sensitivity and the quantum Fisher information under ideal and lossy conditions. We show that both phase sensitivity and the quantum Cramér-Rao bound (QCRB) improve gradually as the total mean photon number increases. For the standard SU(1,1) interferometer, phase sensitivity does not saturate the QCRB, even with multi-photon addition. In contrast, for the Kerr-based SU(1,1) interferometer, phase sensitivity nearly saturates the QCRB under ideal conditions and remains optimal at high transmissivity under loss. The Kerr-based scheme surpasses the standard quantum limit, approaches the sub-Heisenberg limit, and exhibits enhanced robustness against moderate losses. Our scheme is feasible with current technology and provides a promising route for high-precision quantum metrology.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytic Benchmarks for Coherence-to-Entanglement Conversion Under Post-Gate Noise in CNOT-Based Protocols","authors":"Asad Ali,&nbsp;H. Kuniyil,&nbsp;M. I Hussain,&nbsp;M. T. Rahim,&nbsp;A. Slaoui,&nbsp;Saif Al-Kuwari","doi":"10.1002/qute.70381","DOIUrl":"https://doi.org/10.1002/qute.70381","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;Coherence-to-entanglement conversion transforms single-qubit superposition into a practical two-qubit resource, but noise limits this process in near-term quantum hardware. We derive closed-form benchmarks for a minimal CNOT primitive in which a coherent qubit and an incoherent ancilla generate entanglement before undergoing phase damping, global depolarizing, amplitude damping, or independent local depolarizing noise. Using the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ℓ&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$ell _1$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-norm of coherence and negativity, we prove the noiseless law &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ℓ&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$mathcal {N}_0=C_{ell _1}/2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, valid for arbitrary mixed inputs, and obtain exact negativities, survival fractions, and entanglement-sudden-death thresholds. For all &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;X&lt;/mi&gt;\u0000 &lt;annotation&gt;$X$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-state-preserving channels, a master relation shows that entanglement loss results from the competition between coherence suppression and partial-transpose spectral shifts. Phase damping yields &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;η&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$eta =1-p$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; without finite-noise sudden death; global depolarization gives coherence-dependent sudden death; amplitude damping adds an excited-population penalty and sudden death only for &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;θ&lt;/mi&gt;\u0000 &lt;mo&gt;&gt;&lt;/mo&gt;\u0000 &lt;mi&gt;π&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$theta &gt;pi /4$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;; while local depolarization is most destructive at equal depolarizing strength. The initial survival slopes, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$-1$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing Phase Estimation in an SU(1,1) Interferometer via Kerr Nonlinearity and Photon Addition","authors":"Lifen Guo,&nbsp;Qingqian Kang,&nbsp;Zekun Zhao,&nbsp;Jifeng Sun,&nbsp;Shoukang Chang,&nbsp;Qisi Zhou,&nbsp;Teng Zhao,&nbsp;Cunjin Liu,&nbsp;Xin Su,&nbsp;Liyun Hu","doi":"10.1002/qute.70392","DOIUrl":"https://doi.org/10.1002/qute.70392","url":null,"abstract":"<div>\u0000 \u0000 <p>We enhance phase sensitivity in an SU(1,1) interferometer by combining a Kerr nonlinear phase shifter with multi-photon addition. Using coherent and vacuum states as inputs, we analyze phase sensitivity and the quantum Fisher information under ideal and lossy conditions. We show that both phase sensitivity and the quantum Cramér-Rao bound (QCRB) improve gradually as the total mean photon number increases. For the standard SU(1,1) interferometer, phase sensitivity does not saturate the QCRB, even with multi-photon addition. In contrast, for the Kerr-based SU(1,1) interferometer, phase sensitivity nearly saturates the QCRB under ideal conditions and remains optimal at high transmissivity under loss. The Kerr-based scheme surpasses the standard quantum limit, approaches the sub-Heisenberg limit, and exhibits enhanced robustness against moderate losses. Our scheme is feasible with current technology and provides a promising route for high-precision quantum metrology.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive and Robust Control of Diamond Quantum Sensors via Meta-Learning","authors":"Isabell Jauch,&nbsp;Petru Tighineanu,&nbsp;Patrick Tritschler,&nbsp;Thomas Strohm,&nbsp;Tino Fuchs,&nbsp;Fedor Jelezko","doi":"10.1002/qute.70385","DOIUrl":"https://doi.org/10.1002/qute.70385","url":null,"abstract":"<p>High-fidelity quantum sensing with nitrogen-vacancy (NV) ensembles is critically dependent on the precise optimization of microwave control pulses. A significant challenge for the industrial-scale deployment of these sensors is the poor transferability of optimized control protocols, as performance degrades substantially when a protocol for one specific device is applied to another, necessitating a costly and time-intensive recalibration for each new scenario. This problem stems from unavoidable device-to-device variations such as material inhomogeneities, manufacturing tolerances, differences between diamond samples, as well as from dynamic environmental factors like temperature fluctuations and stray magnetic fields. In this work, data-driven optimization techniques are applied to meta-learn quantum-control protocols for NV-ensembles that generalize across hardware and environmental variations. It is demonstrated experimentally that the best meta-learned optimizers can learn nearly optimal protocols and adapt to unseen conditions in as few as <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mn>50</mn>\u0000 </mrow>\u0000 <annotation>$sim 50$</annotation>\u0000 </semantics></math> iterations, representing an improvement of several orders of magnitude relative to state-of-the-art. The resulting transferable surrogate models can rapidly adapt to new, unseen device characteristics, representing a critical shift from single-device optimization to a more robust and scalable strategy for high-fidelity NV-based quantum sensing in practical applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytic Benchmarks for Coherence-to-Entanglement Conversion Under Post-Gate Noise in CNOT-Based Protocols","authors":"Asad Ali,&nbsp;H. Kuniyil,&nbsp;M. I Hussain,&nbsp;M. T. Rahim,&nbsp;A. Slaoui,&nbsp;Saif Al-Kuwari","doi":"10.1002/qute.70381","DOIUrl":"https://doi.org/10.1002/qute.70381","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;Coherence-to-entanglement conversion transforms single-qubit superposition into a practical two-qubit resource, but noise limits this process in near-term quantum hardware. We derive closed-form benchmarks for a minimal CNOT primitive in which a coherent qubit and an incoherent ancilla generate entanglement before undergoing phase damping, global depolarizing, amplitude damping, or independent local depolarizing noise. Using the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ℓ&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$ell _1$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-norm of coherence and negativity, we prove the noiseless law &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ℓ&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$mathcal {N}_0=C_{ell _1}/2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, valid for arbitrary mixed inputs, and obtain exact negativities, survival fractions, and entanglement-sudden-death thresholds. For all &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;X&lt;/mi&gt;\u0000 &lt;annotation&gt;$X$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-state-preserving channels, a master relation shows that entanglement loss results from the competition between coherence suppression and partial-transpose spectral shifts. Phase damping yields &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;η&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$eta =1-p$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; without finite-noise sudden death; global depolarization gives coherence-dependent sudden death; amplitude damping adds an excited-population penalty and sudden death only for &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;θ&lt;/mi&gt;\u0000 &lt;mo&gt;&gt;&lt;/mo&gt;\u0000 &lt;mi&gt;π&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$theta &gt;pi /4$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;; while local depolarization is most destructive at equal depolarizing strength. The initial survival slopes, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$-1$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive and Robust Control of Diamond Quantum Sensors via Meta-Learning","authors":"Isabell Jauch,&nbsp;Petru Tighineanu,&nbsp;Patrick Tritschler,&nbsp;Thomas Strohm,&nbsp;Tino Fuchs,&nbsp;Fedor Jelezko","doi":"10.1002/qute.70385","DOIUrl":"https://doi.org/10.1002/qute.70385","url":null,"abstract":"<p>High-fidelity quantum sensing with nitrogen-vacancy (NV) ensembles is critically dependent on the precise optimization of microwave control pulses. A significant challenge for the industrial-scale deployment of these sensors is the poor transferability of optimized control protocols, as performance degrades substantially when a protocol for one specific device is applied to another, necessitating a costly and time-intensive recalibration for each new scenario. This problem stems from unavoidable device-to-device variations such as material inhomogeneities, manufacturing tolerances, differences between diamond samples, as well as from dynamic environmental factors like temperature fluctuations and stray magnetic fields. In this work, data-driven optimization techniques are applied to meta-learn quantum-control protocols for NV-ensembles that generalize across hardware and environmental variations. It is demonstrated experimentally that the best meta-learned optimizers can learn nearly optimal protocols and adapt to unseen conditions in as few as <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mn>50</mn>\u0000 </mrow>\u0000 <annotation>$sim 50$</annotation>\u0000 </semantics></math> iterations, representing an improvement of several orders of magnitude relative to state-of-the-art. The resulting transferable surrogate models can rapidly adapt to new, unseen device characteristics, representing a critical shift from single-device optimization to a more robust and scalable strategy for high-fidelity NV-based quantum sensing in practical applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface-Level Transcript-Assisted Leakage in Raw-Feedback BB84-State Quantum Identity Authentication","authors":"Shiyu He,&nbsp;Bin Liu,&nbsp;Wei Huang,&nbsp;Bingjie Xu,&nbsp;Yang Li,&nbsp;Wenzhu Shao,&nbsp;Tao Sun","doi":"10.1002/qute.70386","DOIUrl":"https://doi.org/10.1002/qute.70386","url":null,"abstract":"<div>\u0000 \u0000 <p>Quantum identity authentication (QIA) can provide quantum-interface evidence for quantum secure communication, but its interaction with public transcript handling remains insufficiently characterized. This work analyzes a raw-feedback QIA interface based on BB84 states and operating over an authenticated classical channel, where transcript integrity is protected but receiver feedback is public. First, we establish a no-feedback benchmark: direct impersonation reduces to binary discrimination of value-conditioned BB84 mixed states, for which unambiguous state discrimination is impossible and maximum-confidence discrimination gives no forced-response advantage over minimum-error discrimination. Second, we identify a transcript-conditioned leakage mechanism: when an adversary retains a quantum auxiliary system, public raw feedback can condition that system into a pure-state discrimination instance for basis-selection information. We quantify this leakage using guessing probability, conditional min-entropy, accessible information, and an information-disturbance tradeoff. Third, we separate leakage from exploitation: the leakage becomes an impersonation advantage only under implementation deviations such as key-block reuse, weak session binding, abort-handling failure, or overly permissive thresholds. These results yield conservative authentication-length and threshold conditions for noisy and lossy optical implementations.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Activate Genuine Nonlocality From Distinguishable Sets in Tripartite Systems","authors":"Hui-Juan Zuo,&nbsp;Ying-Ying Lu,&nbsp;Shao-Ming Fei","doi":"10.1002/qute.70382","DOIUrl":"https://doi.org/10.1002/qute.70382","url":null,"abstract":"<div>\u0000 \u0000 <p>A set of orthogonal quantum states in multipartite systems is of genuine nonlocality if it is locally indistinguishable in every bipartition. If it is locally reducible when the parties are separated, we say that it has genuine nonlocality of type I; otherwise, it has genuine nonlocality of type II. For a locally distinguishable set without local redundancy, if there exist some orthogonality preserving local measurements such that each outcome leads to a locally indistinguishable set, then we say that it exhibits the activation of nonlocality. We activate type-I and type-II genuine nonlocality of orthogonal product state sets in tripartite systems. In particular, we tackle the local irredundancy problem with partial trace operation and <span></span><math>\u0000 <semantics>\u0000 <mi>p</mi>\u0000 <annotation>$p$</annotation>\u0000 </semantics></math>-ary numeral systems to significantly simplify the proofs. Our results also address the open question raised by Bandyopadhyay et al. [Phys. Rev. A <b>104</b>, L050201 (2021)]. Furthermore, we observe the activation of hidden genuine nonlocality in multipartite systems, which highlights the applications of nonlocality based on state discrimination in different practical scenarios.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantum Parameter Estimation of Optomagnonic Coupling","authors":"Chengsong Zhao,&nbsp;Huan-Jia Li,&nbsp;Ning Zheng,&nbsp;Jia-xin Peng,&nbsp;Ling Zhou","doi":"10.1002/qute.70384","DOIUrl":"https://doi.org/10.1002/qute.70384","url":null,"abstract":"<div>\u0000 \u0000 <p>Optomagnonic interactions bridge microwave-frequency magnons and optical-frequency photons and are important for hybrid quantum technologies. Precise calibration of the optomagnonic coupling strength is therefore essential, especially in the weak-coupling regime. We propose a high-precision estimation scheme for hertz-to-kilohertz optomagnonic coupling strengths based on homodyne detection of measurable output temporal modes under realistic experimental constraints. Using quantum Fisher information (QFI), we identify optimal operating regimes and show that joint local optical homodyne detection can nearly saturate the intracavity QFI over a broad parameter range. By constructing finite-duration output temporal modes, we further demonstrate that the Fisher information can be efficiently extracted from accessible optical outputs. Finally, numerical simulations of the measurement process verify the estimation workflow and its robustness against parameter uncertainties.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}