{"title":"Back Cover: Nonreciprocal Unconventional Photon Blockade with Kerr Magnons (Adv. Quantum Technol. 8/2024)","authors":"Xiao-Hong Fan, Yi-Ning Zhang, Jun-Po Yu, Ming-Yue Liu, Wen-Di He, Hai-Chao Li, Wei Xiong","doi":"10.1002/qute.202470022","DOIUrl":"https://doi.org/10.1002/qute.202470022","url":null,"abstract":"<p>In article number 2400043, Hai-Chao Li, Wei Xiong, and co-workers first propose to achieve nonreciprocal unconventional photon blockade with Kerr magnons. By tuning the direction of the biased magnetic field, the Kerr coefficient can be opposite, giving rise to nonreciprocity. With such a nonreciprocal nonlinearity, direction-dependent unconventional photon blockade, destructively interfering between two transition paths, can be realized in single- and two-sphere cavity–magnon systems. By tuning magnon–photon coupling, reciprocal and nonreciprocal photon blockade can be arbitrarily switched for two-sphere setup. This study offers a potential platform for investigating nonreciprocal photon blockade effect with Kerr magnons.\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 8","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141985997","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}
Pietro Lombardi, Hristina Georgieva, Franziska Hirt, Juergen Mony, Rocco Duquennoy, Ramin Emadi, Maria Guadalupe Aparicio, Maja Colautti, Marco López, Stefan Kück, Costanza Toninelli
{"title":"Advances in Quantum Metrology with Dielectrically Structured Single Photon Sources Based on Molecules","authors":"Pietro Lombardi, Hristina Georgieva, Franziska Hirt, Juergen Mony, Rocco Duquennoy, Ramin Emadi, Maria Guadalupe Aparicio, Maja Colautti, Marco López, Stefan Kück, Costanza Toninelli","doi":"10.1002/qute.202400107","DOIUrl":"10.1002/qute.202400107","url":null,"abstract":"<p>In the realm of fundamental quantum science and technologies, non-classical states of light, such as single-photon Fock states, are widely studied. However, current standards and metrological procedures are not optimized for low light levels. Progress in this crucial scientific domain depends on innovative metrology approaches, utilizing reliable devices based on quantum effects. A new generation of molecule-based single-photon sources is presented, combining their integration in a polymeric micro-lens with pulsed excitation schemes, thereby realizing suitable resources in quantum radiometry. The strategy enhances the efficiency of generated single photon pulses and improves stability, providing a portable source at 784.7 nm that maintains consistent performance even through a cooling and heating cycle. The calibration of a single-photon avalanche detector is demonstrated using light sources with different photon statistics, and the advantages of the single-molecule device are discussed. A relative uncertainty on the intrinsic detection efficiency well below 1% is attained, representing a new benchmark in the field.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 10","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218951","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":"Multiparty Quantum Key Agreement Based on \u0000 \u0000 d\u0000 $d$\u0000 -dimensional Bell States","authors":"Ya-Xi Shu, Chen-Ming Bai, Wan-Li Hong, Sujuan Zhang","doi":"10.1002/qute.202400204","DOIUrl":"10.1002/qute.202400204","url":null,"abstract":"<p>In this paper, on the design process of a multiparty quantum key agreement protocol within a <span></span><math>\u0000 <semantics>\u0000 <mi>d</mi>\u0000 <annotation>$d$</annotation>\u0000 </semantics></math>-dimensional Hilbert space is elaborated upon. A circular-type multiparty quantum key agreement protocol based on the generalized Bell state is introduced. To enhance security against external attacks, <span></span><math>\u0000 <semantics>\u0000 <mi>n</mi>\u0000 <annotation>$n$</annotation>\u0000 </semantics></math> decoy states into the transmission process is incorporated. Transmission sequences of the generalized Bell state and decoy states are passed between participants. The participants then encode their secret information into the corresponding particles. Ultimately, all participants are able to derive the same key. In addition, a combination of <span></span><math>\u0000 <semantics>\u0000 <mi>d</mi>\u0000 <annotation>$d$</annotation>\u0000 </semantics></math>-dimensional Pauli operators is utilized, making the proposed protocol feasible with current technology. Analysis and protection against intercept-resend attack, entangle-measure attack and dishonest participants attacks, demonstrating the feasibility of the protocol in a <span></span><math>\u0000 <semantics>\u0000 <mi>d</mi>\u0000 <annotation>$d$</annotation>\u0000 </semantics></math>-dimensional Hilbert space. The protocol has certain advantages over other protocols in terms of a comprehensive consideration of security and efficiency.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 11","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218955","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}