Advanced quantum technologies最新文献

{"title":"Nonreciprocal Entanglement in Spinning Cavity Magnomechanical System with Coherent Feedback Loop","authors":"Cheng-Zhi Gao,&nbsp;Guo-Qing Liu,&nbsp;Nan Wang,&nbsp;Lin Yu,&nbsp;Ai-Dong Zhu","doi":"10.1002/qute.202500063","DOIUrl":"https://doi.org/10.1002/qute.202500063","url":null,"abstract":"<p>A scheme is proposed for generating and enhancing stable nonreciprocal entanglement in a spinning cavity magnomechanical system. The key components of this scheme include a ferromagnetic yttrium iron garnet sphere and a whispering gallery mode resonator supporting two counter-propagating modes. To further optimize the performance of the system, a coherent feedback loop is introduced to reinject the dissipated energy back into the system. This not only provides an additional coupling path for the system but also effectively avoids introducing additional noise caused by measurement. The design significantly enhances both bipartite entanglement and genuine tripartite entanglement. Meanwhile, by spinning the resonator, the cavity modes experience Fizeau drag due to the optical Sagnac effect, thereby achieving nonreciprocal entanglement, which is crucial for applications such as unidirectional quantum communication channels. Additionally, the research demonstrates that even in the presence of backscattering, the entangled state can still recover significantly, highlighting the robustness of entanglement under photon backscattering. This work provides an effective method to enhance and protect quantum resources and holds important application potential for applications in quantum information processing based on magnonics.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944730","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":"Front Cover: Effect and Compensation of Polarization-Dependent Loss in Free-Space Reference Frame Independent Quantum Key Distribution (Adv. Quantum Technol. 3/2025)","authors":"Kyongchun Lim,&nbsp;Byung-Seok Choi,&nbsp;Ju Hee Baek,&nbsp;Minchul Kim,&nbsp;Joong-Seon Choe,&nbsp;Kap-Joong Kim,&nbsp;Dong Churl Kim,&nbsp;Junsang Oh,&nbsp;Chun Ju Youn","doi":"10.1002/qute.202570006","DOIUrl":"https://doi.org/10.1002/qute.202570006","url":null,"abstract":"<p>In article number 2400492, Kyongchun Lim, Chun Ju Youn, and co-workers investigate the effect of polarization-dependent loss (PDL) on free-space quantum key distribution (QKD) and proposes a fundamental compensation method that optically corrects PDL without relying on post-selection techniques. Experimental results demonstrate that the proposed method effectively mitigates PDL, improving polarization state integrity and significantly enhancing QKD performance, contributing to more robust and secure quantum key distribution systems.\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":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622394","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":"Issue Information (Adv. Quantum Technol. 3/2025)","authors":"","doi":"10.1002/qute.202570007","DOIUrl":"https://doi.org/10.1002/qute.202570007","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622395","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":"Back Cover: Direct-Laser-Written Polymer Nanowire Waveguides for Broadband Single Photon Collection from Epitaxial Quantum Dots into a Gaussian-like Mode (Adv. Quantum Technol. 2/2025)","authors":"Edgar F. Perez,&nbsp;Cori Haws,&nbsp;Marcelo Davanco,&nbsp;Jindong Song,&nbsp;Luca Sapienza,&nbsp;Kartik Srinivasan","doi":"10.1002/qute.202570004","DOIUrl":"https://doi.org/10.1002/qute.202570004","url":null,"abstract":"<p>In article number 2300149, Edgar F. Perez, Kartik Srinivasan, and co-workers study the implementation of high-dimensional quantum key distribution protocols, HD-Ext-B92 and HD-BB84, via satellite. The study modifies key rate calculations to explore variations in key rate, probability distribution, and quantum bit error rate (QBER) with respect to dimension and noise. The research examines how average key rate changes with zenith angle and link length under different weather conditions, showing HD-BB84's superior performance in higher dimensions despite higher QBER saturation. The down-link configuration is shown to be preferable over the up-link configuration.\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":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389407","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":"Improving User Privacy in Practical Quantum Private Query with Group Honesty Checking","authors":"Chun-Yan Wei,&nbsp;Qing-Le Wang,&nbsp;Xiao-Qiu Cai,&nbsp;Tian-Yin Wang","doi":"10.1002/qute.202400429","DOIUrl":"https://doi.org/10.1002/qute.202400429","url":null,"abstract":"&lt;p&gt;Current cheat-sensitive security level of user privacy in quantum private query (QPQ) is far from meeting its ideal requirement. Dishonest database trying to elicit user privacy can only be (delayedly) detected after the finish of the protocol with merely a nonzero probability. Worse yet, no estimation of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mi&gt;u&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$p_{succ}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;(i.e., the success probability of dishonest database's cheating) has been given till now. Such estimation is quite necessary because a significant &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mi&gt;u&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$p_{succ}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; means frangible user privacy especially in the cheat-sensitive security model. Here, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mi&gt;u&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$p_{succ}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of the first and best-known quantum-key-distribution (QKD)-based QPQ protocol proposed by Jakobi et al. is estimated, which shows that dishonest database can elicit user privacy with significant probability (e.g., as high as 42.8% for database size &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;10000&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$N=10000$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) while such cheating can only be (delayedly) detected with probability 50 %. Common strategy to improve user privacy, i.e., adding honesty checking to detect malicious database may hurt the privacy of the other party, i.e. database security. To solve this problem, a new group honesty checking is proposed, which will not hurt database security and can reduce $ &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;p&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mi&gt;u&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$p_{succ}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; to a very small value (e.g. 0.26% for database size 10000), thus a","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622661","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":"Recent Advances in Photonic Quantum Technologies","authors":"Mohamed Benyoucef","doi":"10.1002/qute.202400628","DOIUrl":"https://doi.org/10.1002/qute.202400628","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389408","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":"Front Cover: Spatial Distribution Control of Room-Temperature Single Photon Emitters in the Telecom Range from GaN Thin Films Grown on Patterned Sapphire Substrates (Adv. Quantum Technol. 2/2025)","authors":"Hyemin Kim,&nbsp;Yong-Ho Song,&nbsp;Young-Ho Ko,&nbsp;Yong-Hoon Cho","doi":"10.1002/qute.202570003","DOIUrl":"https://doi.org/10.1002/qute.202570003","url":null,"abstract":"<p>In article number 2400177, Yong-Hoon Cho and co-workers controlled spatial distribution of room-temperature, telecom-wavelength emitting single-photon emitters (bright red colours) based on defects in GaN thin film grown on patterned sapphire substrates with varying pattern sizes and dimensions. This approach effectively controls the position of emitters between patterns and enhances the photon extraction efficiency via pattern size optimization.\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":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389406","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":"Issue Information (Adv. Quantum Technol. 2/2025)","authors":"","doi":"10.1002/qute.202570005","DOIUrl":"https://doi.org/10.1002/qute.202570005","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389405","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":"Hardware-Efficient Quantum Random Access Memory Design with a Native Gate Set on Superconducting Platforms","authors":"Yun-Jie Wang,&nbsp;Sheng Zhang,&nbsp;Tai-Ping Sun,&nbsp;Ze-An Zhao,&nbsp;Xiao-Fan Xu,&nbsp;Xi-Ning Zhuang,&nbsp;Huan-Yu Liu,&nbsp;Cheng Xue,&nbsp;Peng Duan,&nbsp;Yu-Chun Wu,&nbsp;Zhao-Yun Chen,&nbsp;Guo-Ping Guo","doi":"10.1002/qute.202400519","DOIUrl":"https://doi.org/10.1002/qute.202400519","url":null,"abstract":"<p>Quantum Random Access Memory (QRAM) is a critical component for enabling data queries in superposition, which is the cornerstone of quantum algorithms. Among various QRAM architectures, the bucket-brigade model stands out due to its noise resilience. This study presents a hardware-efficient native gate set <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>{</mo>\u0000 <mi>iSCZ</mi>\u0000 <mo>,</mo>\u0000 <mi>C</mi>\u0000 <mo>−</mo>\u0000 <mi>iSCZ</mi>\u0000 <mo>,</mo>\u0000 <msup>\u0000 <mi>S</mi>\u0000 <mo>†</mo>\u0000 </msup>\u0000 <mo>}</mo>\u0000 </mrow>\u0000 <annotation>$lbrace textsf {iSCZ}, textsf {C-iSCZ}, textsf {S}^{dagger }rbrace$</annotation>\u0000 </semantics></math> for implementing bucket-brigade QRAM on superconducting platforms. The experimental feasibility of the proposed gate set is demonstrated, showing high fidelity and reduced complexity. By leveraging the complementary control property in QRAM, the approach directly substitutes the conventional <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>{</mo>\u0000 <mi>SWAP</mi>\u0000 <mo>,</mo>\u0000 <mi>CSWAP</mi>\u0000 <mo>}</mo>\u0000 </mrow>\u0000 <annotation>$lbrace textsf {SWAP}, textsf {CSWAP} rbrace$</annotation>\u0000 </semantics></math> gates with the new gate set, eliminating decomposition overhead and significantly reducing circuit depth and gate count.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944939","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":"Heteroepitaxial (111) Diamond Quantum Sensors with Preferentially Aligned Nitrogen-Vacancy Centers for an Electric Vehicle Battery Monitor","authors":"Kenichi Kajiyama,&nbsp;Moriyoshi Haruyama,&nbsp;Yuji Hatano,&nbsp;Hiromitsu Kato,&nbsp;Masahiko Ogura,&nbsp;Toshiharu Makino,&nbsp;Hitoshi Noguchi,&nbsp;Takeharu Sekiguchi,&nbsp;Takayuki Iwasaki,&nbsp;Mutsuko Hatano","doi":"10.1002/qute.202400400","DOIUrl":"https://doi.org/10.1002/qute.202400400","url":null,"abstract":"<p>A platform for heteroepitaxial (111) chemical vapor deposition (CVD) diamond quantum sensors with preferentially aligned nitrogen vacancy (NV) centers on a large substrate is developed, and its operation as an electric vehicle (EV) battery monitor is demonstrated. A self-standing heteroepitaxial CVD diamond film with a (111) orientation and a thickness of 150 µm is grown on a non-diamond substrate and subsequently separated from it. The high uniformity and crystallinity of the (111)-oriented diamond is confirmed. A 150-µm thick NV-diamond layer is then deposited on the heteroepitaxial diamond. The <i>T</i>₂ value measured by confocal microscopy is 20 µs, which corresponds to substitutional nitrogen defect concentration of 8 ppm. The nitrogen-vacancy concentration and <i>T</i>₂^* are estimated to be 0.05 ppm and 0.05 µs by continuous wave optically detected magnetic resonance (CW-ODMR) spectroscopy in a fiber-top sensor configuration. In a gradiometer, where two sensors are placed on both sides of the busbar, the noise floor is 17 nT/Hz^0.5 in the frequency range of 10–40 Hz without magnetic shielding. The Allan deviation of the magnetic field noise in the laboratory is below 0.3 µT, which corresponds to a busbar current of 10 mA, in the accumulation time range of 10 ms to 100 s.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400400","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793328","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}