Advanced quantum technologies最新文献

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Implementation of Entanglement Witnesses with Quantum Circuits 用量子电路实现纠缠见证
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-12 DOI: 10.1002/qute.202400272
Shu-Qian Shen, Xin-Qi Gao, Rui-Qi Zhang, Ming Li, Shao-Ming Fei
{"title":"Implementation of Entanglement Witnesses with Quantum Circuits","authors":"Shu-Qian Shen,&nbsp;Xin-Qi Gao,&nbsp;Rui-Qi Zhang,&nbsp;Ming Li,&nbsp;Shao-Ming Fei","doi":"10.1002/qute.202400272","DOIUrl":"10.1002/qute.202400272","url":null,"abstract":"<p>Entanglement witnesses are economical tools for the experimental detection of quantum entanglement. Quantum algorithms for entanglement detection have recently attracted considerable attention. Based on block encoding techniques and state preparation methods, the implementation of several types of entanglement witnesses using quantum circuits without quantum state tomography is proposed. Further, explicit quantum circuits for the block encoding of some special matrices are presented.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262890","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}
引用次数: 0
Enhancing the Sensitivity of Quantum Fiber-Optical Gyroscope via a Non-Gaussian-State Probe 通过非高斯状态探测器提高量子光纤陀螺仪的灵敏度
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-12 DOI: 10.1002/qute.202400270
Wen-Xun Zhang, Rui Zhang, Yunlan Zuo, Le-Man Kuang
{"title":"Enhancing the Sensitivity of Quantum Fiber-Optical Gyroscope via a Non-Gaussian-State Probe","authors":"Wen-Xun Zhang,&nbsp;Rui Zhang,&nbsp;Yunlan Zuo,&nbsp;Le-Man Kuang","doi":"10.1002/qute.202400270","DOIUrl":"10.1002/qute.202400270","url":null,"abstract":"<p>A theoretical scheme to enhance the sensitivity of a quantum fiber-optical gyroscope (QFOG) via a non-Gaussian-state probe based on quadrature measurements of the optical field is proposed. The non-Gaussian-state probe utilizes the product state comprising a photon-added coherent state (PACS) with photon excitations and a coherent state (CS). The sensitivity of the QFOG is studied and it is found that it can be significantly enhanced through increasing the photon excitations in the PACS probe. The influence of photon loss on the performance of QFOG is investigated and it is demonstrated that the PACS probe exhibits robust resistance to photon loss. Furthermore, the performance of the QFOG using the PACS probe against two Gaussian-state probes: the CS probe and the squeezed state (SS) probe is compared and it is indicated that the PACS probe offers a significant advantage in terms of sensitivity, regardless of photon loss, under the constraint condition of the same total number of input photons. Particularly, it is found that the sensitivity of the PACS probe can be three orders of magnitude higher than that of two Gaussian-state probes for certain values of the measured parameter. The capabilities of the non-Gaussian state probe in enhancing the sensitivity and resisting photon loss can have a wide-ranging impact on future high-performance QFOGs.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262889","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}
引用次数: 0
Front Cover: Superconducting Diode Effect in a Constricted Nanowire (Adv. Quantum Technol. 9/2024) 封面:束缚纳米线中的超导二极管效应(Adv. Quantum Technol.)
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-11 DOI: 10.1002/qute.202470023
Xiaofu Zhang, Qingchang Huan, Ruoyan Ma, Xingyu Zhang, Jia Huang, Xiaoyu Liu, Wei Peng, Hao Li, Zhen Wang, Xiaoming Xie, Lixing You
{"title":"Front Cover: Superconducting Diode Effect in a Constricted Nanowire (Adv. Quantum Technol. 9/2024)","authors":"Xiaofu Zhang,&nbsp;Qingchang Huan,&nbsp;Ruoyan Ma,&nbsp;Xingyu Zhang,&nbsp;Jia Huang,&nbsp;Xiaoyu Liu,&nbsp;Wei Peng,&nbsp;Hao Li,&nbsp;Zhen Wang,&nbsp;Xiaoming Xie,&nbsp;Lixing You","doi":"10.1002/qute.202470023","DOIUrl":"https://doi.org/10.1002/qute.202470023","url":null,"abstract":"<p>Superconducting diodes with nonreciprocal transport effect enable constructing novel logic devices, thereby laying the cornerstone of contemporary integrated circuits technology beyond Josephson junction-based circuits. Xiaofu Zhang, Lixing You, and co-workers designed and fabricated novel superconducting diodes based on the minimal superconducting electrical component – the superconducting nanowire –, which can rectify both square-wave and sine-wave signals without distortion (see article number 2300378). The superconducting nanowire diodes are irrespective of specific superconducting materials, and therefore promising for constructing low-dissipation superconducting integrated circuits for novel computation architectures.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 9","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170095","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}
引用次数: 0
Inside Front Cover: Compact and Stable Diamond Quantum Sensors for Wide Applications (Adv. Quantum Technol. 9/2024) 封面内页:面向广泛应用的紧凑稳定的金刚石量子传感器(Adv. Quantum Technol.)
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-11 DOI: 10.1002/qute.202470024
Yuta Kainuma, Yuji Hatano, Takayuki Shibata, Naota Sekiguchi, Akimichi Nakazono, Hiromitsu Kato, Shinobu Onoda, Takeshi Ohshima, Mutsuko Hatano, Takayuki Iwasaki
{"title":"Inside Front Cover: Compact and Stable Diamond Quantum Sensors for Wide Applications (Adv. Quantum Technol. 9/2024)","authors":"Yuta Kainuma,&nbsp;Yuji Hatano,&nbsp;Takayuki Shibata,&nbsp;Naota Sekiguchi,&nbsp;Akimichi Nakazono,&nbsp;Hiromitsu Kato,&nbsp;Shinobu Onoda,&nbsp;Takeshi Ohshima,&nbsp;Mutsuko Hatano,&nbsp;Takayuki Iwasaki","doi":"10.1002/qute.202470024","DOIUrl":"https://doi.org/10.1002/qute.202470024","url":null,"abstract":"<p>A diamond quantum sensor, based on an ensemble of nitrogen-vacancy (NV) centers in diamond, is depicted being held by the author's hand. This sensor module is compact, highly magnetically sensitive, and stable. It was achieved by mounting a <sup>12</sup>C-enriched chemical vapor deposition diamond, optics for high collection efficiency of NV fluorescence, and a balancing circuit to cancel out laser noise in the sensor module. This compact module is expected to be versatile across a broad spectrum of applications. For further information on the device and its applications, see article number 2300456 by Yuta Kainuma, Takayuki Iwasaki, and co-workers.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 9","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170162","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}
引用次数: 0
Issue Information (Adv. Quantum Technol. 9/2024) 发行信息(Adv. Quantum Technol.)
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-11 DOI: 10.1002/qute.202470025
{"title":"Issue Information (Adv. Quantum Technol. 9/2024)","authors":"","doi":"10.1002/qute.202470025","DOIUrl":"https://doi.org/10.1002/qute.202470025","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 9","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170193","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}
引用次数: 0
Back Cover: Triggering and Modulation of Quantum Magnon-Photon Hall Insulator in a 1D Cavity Magnonics Lattice (Adv. Quantum Technol. 9/2024) 封底:一维腔磁子晶格中量子磁子-光子霍尔绝缘体的触发和调制(Adv.)
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-11 DOI: 10.1002/qute.202470026
Lü Xiang, He Wang, Zi-Meng Li, Zhu-Cheng Zhang, Yi-Ping Wang
{"title":"Back Cover: Triggering and Modulation of Quantum Magnon-Photon Hall Insulator in a 1D Cavity Magnonics Lattice (Adv. Quantum Technol. 9/2024)","authors":"Lü Xiang,&nbsp;He Wang,&nbsp;Zi-Meng Li,&nbsp;Zhu-Cheng Zhang,&nbsp;Yi-Ping Wang","doi":"10.1002/qute.202470026","DOIUrl":"https://doi.org/10.1002/qute.202470026","url":null,"abstract":"<p>In article number 2400111, Zhu-Cheng Zhang, Yi-Ping Wang, and co-workers propose a scheme for implementing a one-dimensional cavity magnonics lattice that exhibits quantum magnon–photon Hall insulator behaviors. By adjusting corresponding parameters, different energy spectrum structures can be triggered, and the flipping of edge states can be observed, enabling multi-channel topological quantum state transmission.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 9","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170163","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}
引用次数: 0
High-Dimensional Photonic Quantum Computing with a Measurement-Free Auxiliary System 使用无测量辅助系统的高维光子量子计算
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-09 DOI: 10.1002/qute.202400208
Xue-Mei Ren, Fang-Fang Du
{"title":"High-Dimensional Photonic Quantum Computing with a Measurement-Free Auxiliary System","authors":"Xue-Mei Ren,&nbsp;Fang-Fang Du","doi":"10.1002/qute.202400208","DOIUrl":"10.1002/qute.202400208","url":null,"abstract":"<p>Enhancing the capabilities of quantum computing relies heavily on harnessing the power of qudit-based high-dimensional quantum gates. In the study, single-qudit 4D <span></span><math>\u0000 <semantics>\u0000 <mi>X</mi>\u0000 <annotation>$ X$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <msup>\u0000 <mi>X</mi>\u0000 <mn>2</mn>\u0000 </msup>\u0000 <annotation>$ X^{2}$</annotation>\u0000 </semantics></math>, and <span></span><math>\u0000 <semantics>\u0000 <msup>\u0000 <mi>X</mi>\u0000 <mo>†</mo>\u0000 </msup>\u0000 <annotation>$ X^{dagger }$</annotation>\u0000 </semantics></math> gates tailored for a two-photon system in polarization states are presented. Furthermore, a two-qudit <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>4</mn>\u0000 <mo>×</mo>\u0000 <mn>4</mn>\u0000 </mrow>\u0000 <annotation>$4times 4$</annotation>\u0000 </semantics></math>-dimensional controlled-not (CNOT) gate designed for a four-photon system is introduced. These high-dimensional gates can offer versatile and straightforward optical implementations, ensuring them to fulfill in a deterministic way. To facilitate these processes, an auxiliary system in the form of a <span></span><math>\u0000 <semantics>\u0000 <mi>Λ</mi>\u0000 <annotation>$Lambda$</annotation>\u0000 </semantics></math>-type atom residing in a cavity is employed. Remarkably, the auxiliary system retains its original state after the operation process ends, so it is not required to measure and plays a pivotal role in promoting effective interactions among distinct photons in its extended coherence time. Importantly, the in-depth analysis of the fidelities and efficiencies of these quantum gates showcase remarkable outcomes, affirming the superiority of the proposed protocols. Therefore, these high-dimensional gates not only amplify quantum parallelism, but also bolster the speed of quantum computations, fortify resilience against errors, and foster scalability for executing intricate quantum operations.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 11","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218903","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}
引用次数: 0
Spin- s $s$ Dicke States and Their Preparation 自旋$s$迪克态及其制备方法
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-09 DOI: 10.1002/qute.202400057
Rafael I. Nepomechie, Francesco Ravanini, David Raveh
{"title":"Spin-\u0000 \u0000 s\u0000 $s$\u0000 Dicke States and Their Preparation","authors":"Rafael I. Nepomechie,&nbsp;Francesco Ravanini,&nbsp;David Raveh","doi":"10.1002/qute.202400057","DOIUrl":"10.1002/qute.202400057","url":null,"abstract":"<p>The notion of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mo>(</mo>\u0000 <mn>2</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$su(2)$</annotation>\u0000 </semantics></math> spin-<span></span><math>\u0000 <semantics>\u0000 <mi>s</mi>\u0000 <annotation>$s$</annotation>\u0000 </semantics></math> Dicke states is introduced, which are higher-spin generalizations of usual (spin-1/2) Dicke states. These multi-qudit states can be expressed as superpositions of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mo>(</mo>\u0000 <mn>2</mn>\u0000 <mi>s</mi>\u0000 <mo>+</mo>\u0000 <mn>1</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$su(2s+1)$</annotation>\u0000 </semantics></math> qudit Dicke states. They satisfy a recursion formula, which is used to formulate an efficient quantum circuit for their preparation, whose size scales as <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>k</mi>\u0000 <mo>(</mo>\u0000 <mn>2</mn>\u0000 <mi>s</mi>\u0000 <mi>n</mi>\u0000 <mo>−</mo>\u0000 <mi>k</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$sk(2sn-k)$</annotation>\u0000 </semantics></math>, where <span></span><math>\u0000 <semantics>\u0000 <mi>n</mi>\u0000 <annotation>$n$</annotation>\u0000 </semantics></math> is the number of qudits and <span></span><math>\u0000 <semantics>\u0000 <mi>k</mi>\u0000 <annotation>$k$</annotation>\u0000 </semantics></math> is the number of times the total spin-lowering operator is applied to the highest-weight state. The algorithm is deterministic and does not require ancillary qudits.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218904","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}
引用次数: 0
Quantum Effect Enables Large Elastocaloric Effect in Monolayer MoSi 2 N 4 ${rm MoSi}_2{rm N}_4$ and Graphene 量子效应在单层 MoSi2N4${rm MoSi}_2{rm N}_4$ 和石墨烯中产生巨大的弹性效应
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-09 DOI: 10.1002/qute.202400391
Yan Yin, Weiwei He, Wei Tang, Min Yi
{"title":"Quantum Effect Enables Large Elastocaloric Effect in Monolayer \u0000 \u0000 \u0000 \u0000 MoSi\u0000 2\u0000 \u0000 \u0000 N\u0000 4\u0000 \u0000 \u0000 ${rm MoSi}_2{rm N}_4$\u0000 and Graphene","authors":"Yan Yin,&nbsp;Weiwei He,&nbsp;Wei Tang,&nbsp;Min Yi","doi":"10.1002/qute.202400391","DOIUrl":"10.1002/qute.202400391","url":null,"abstract":"&lt;p&gt;Low-dimensional materials with outstanding heat conductivity and elastocaloric effect (eCE) are significant for environmentally friendly and energy-efficient nano refrigerators. However, most of elastocaloric materials with first/second-order phase transition suffer from hysteresis loss. Herein, an emerging monolayer &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;MoSi&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm MoSi}_2{rm N}_4$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; is theoretically demonstrated as a promising candidate, which exhibits no hysteresis loss enabled by reversible elastic response, as well as large eCE and high eC strength enabled by quantum effect (QE). Considering the remarkable influence of QE and thermo-mechanical coupling (TMC) in the monolayer limit, the adiabatic temperature change (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Delta {T}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) is evaluate by incorporating QE and TMC. Molecular dynamics simulation significantly underestimates &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Delta {T}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, whereas method with QE slightly overestimates &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Delta {T}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; when compared to method with QE+TMC. At 300 K, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Delta {T}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of &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;MoSi&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm MoSi}_2{rm N}_4$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; is –(11–42) K under biaxial tensile forces of 26–84 nN. The elastocaloric coefficients are –(0.3–0.9) &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;KnN&lt;/mi&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;/msup&gt;\u0000 &lt;annotation&gt;${rm KnN}^{-1}$&lt;/a","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218884","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}
引用次数: 0
Fully-Optimized Quantum Metrology: Framework, Tools, and Applications 全优化量子计量学:框架、工具和应用
IF 4.4
Advanced quantum technologies Pub Date : 2024-09-09 DOI: 10.1002/qute.202400094
Qiushi Liu, Zihao Hu, Haidong Yuan, Yuxiang Yang
{"title":"Fully-Optimized Quantum Metrology: Framework, Tools, and Applications","authors":"Qiushi Liu,&nbsp;Zihao Hu,&nbsp;Haidong Yuan,&nbsp;Yuxiang Yang","doi":"10.1002/qute.202400094","DOIUrl":"10.1002/qute.202400094","url":null,"abstract":"<p>This tutorial introduces a systematic approach for addressing the key question of quantum metrology: For a generic task of sensing an unknown parameter, what is the ultimate precision given a constrained set of admissible strategies. The approach outputs the maximal attainable precision (in terms of the maximum of quantum Fisher information) as a semidefinite program and optimal strategies as feasible solutions thereof. Remarkably, the approach can identify the optimal precision for different sets of strategies, including parallel, sequential, quantum SWITCH-enhanced, causally superposed, and generic indefinite-causal-order strategies. The tutorial consists of a pedagogic introduction to the background and mathematical tools of optimal quantum metrology, a detailed derivation of the main approach, and various concrete examples. As shown in the tutorial, applications of the approach include, but are not limited to, strict hierarchy of strategies in noisy quantum metrology, memory effect in non-Markovian metrology, and designing optimal strategies. Compared with traditional approaches, the approach here yields the exact value of the optimal precision, offering more accurate criteria for experiments and practical applications. It also allows for the comparison between conventional strategies and the recently discovered causally-indefinite strategies, serving as a powerful tool for exploring this new area of quantum metrology.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218908","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}
引用次数: 0
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