Benjamin Whitefield, Milos Toth, Igor Aharonovich, Jean-Philippe Tetienne, Mehran Kianinia
The image depicts the optical excitation of negatively charged boron vacancies in a hexagonal boron nitride lattice. The lattice is positioned on top of a gold stripe which applies a radio frequency used for optically detected magnetic resonance. The magnet placed on the lattice represents the capability of precise magnetic field sensing available with this spin control technique. More in article number 2300118, Igor Aharonovich and co-workers.
{"title":"Magnetic Field Sensitivity Optimization of Negatively Charged Boron Vacancy Defects in hBN (Adv. Quantum Technol. 4/2025)","authors":"Benjamin Whitefield, Milos Toth, Igor Aharonovich, Jean-Philippe Tetienne, Mehran Kianinia","doi":"10.1002/qute.202570008","DOIUrl":"https://doi.org/10.1002/qute.202570008","url":null,"abstract":"<p>The image depicts the optical excitation of negatively charged boron vacancies in a hexagonal boron nitride lattice. The lattice is positioned on top of a gold stripe which applies a radio frequency used for optically detected magnetic resonance. The magnet placed on the lattice represents the capability of precise magnetic field sensing available with this spin control technique. More in article number 2300118, Igor Aharonovich 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":"8 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793692","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}
Kyongchun Lim, Byung-Seok Choi, Ju Hee Baek, Minchul Kim, Joong-Seon Choe, Kap-Joong Kim, Dong Churl Kim, Junsang Oh, Chun Ju Youn
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.
{"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, Byung-Seok Choi, Ju Hee Baek, Minchul Kim, Joong-Seon Choe, Kap-Joong Kim, Dong Churl Kim, Junsang Oh, 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}
Edgar F. Perez, Cori Haws, Marcelo Davanco, Jindong Song, Luca Sapienza, Kartik Srinivasan
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.
{"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, Cori Haws, Marcelo Davanco, Jindong Song, Luca Sapienza, 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}
Chun-Yan Wei, Qing-Le Wang, Xiao-Qiu Cai, Tian-Yin Wang
<p>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 <span></span><math> <semantics> <msub> <mi>p</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>c</mi> <mi>c</mi> </mrow> </msub> <annotation>$p_{succ}$</annotation> </semantics></math>(i.e., the success probability of dishonest database's cheating) has been given till now. Such estimation is quite necessary because a significant <span></span><math> <semantics> <msub> <mi>p</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>c</mi> <mi>c</mi> </mrow> </msub> <annotation>$p_{succ}$</annotation> </semantics></math> means frangible user privacy especially in the cheat-sensitive security model. Here, <span></span><math> <semantics> <msub> <mi>p</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>c</mi> <mi>c</mi> </mrow> </msub> <annotation>$p_{succ}$</annotation> </semantics></math> 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 <span></span><math> <semantics> <mrow> <mi>N</mi> <mo>=</mo> <mn>10000</mn> </mrow> <annotation>$N=10000$</annotation> </semantics></math>) 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 $ <span></span><math> <semantics> <msub> <mi>p</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>c</mi> <mi>c</mi> </mrow> </msub> <annotation>$p_{succ}$</annotation> </semantics></math> to a very small value (e.g. 0.26% for database size 10000), thus a
{"title":"Improving User Privacy in Practical Quantum Private Query with Group Honesty Checking","authors":"Chun-Yan Wei, Qing-Le Wang, Xiao-Qiu Cai, Tian-Yin Wang","doi":"10.1002/qute.202400429","DOIUrl":"https://doi.org/10.1002/qute.202400429","url":null,"abstract":"<p>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 <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mi>c</mi>\u0000 <mi>c</mi>\u0000 </mrow>\u0000 </msub>\u0000 <annotation>$p_{succ}$</annotation>\u0000 </semantics></math>(i.e., the success probability of dishonest database's cheating) has been given till now. Such estimation is quite necessary because a significant <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mi>c</mi>\u0000 <mi>c</mi>\u0000 </mrow>\u0000 </msub>\u0000 <annotation>$p_{succ}$</annotation>\u0000 </semantics></math> means frangible user privacy especially in the cheat-sensitive security model. Here, <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mi>c</mi>\u0000 <mi>c</mi>\u0000 </mrow>\u0000 </msub>\u0000 <annotation>$p_{succ}$</annotation>\u0000 </semantics></math> 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 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>N</mi>\u0000 <mo>=</mo>\u0000 <mn>10000</mn>\u0000 </mrow>\u0000 <annotation>$N=10000$</annotation>\u0000 </semantics></math>) 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 $ <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>u</mi>\u0000 <mi>c</mi>\u0000 <mi>c</mi>\u0000 </mrow>\u0000 </msub>\u0000 <annotation>$p_{succ}$</annotation>\u0000 </semantics></math> 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}
Hyemin Kim, Yong-Ho Song, Young-Ho Ko, Yong-Hoon Cho
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.
{"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, Yong-Ho Song, Young-Ho Ko, 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}
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