Advanced quantum technologies最新文献

{"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}

{"title":"Front Cover: Enhanced Quantum Entanglement Detection of General Two Qubits Systems Based on Modified CNN-BiLSTM Model (Adv. Quantum Technol. 1/2025)","authors":"Qian Sun,&nbsp;Zhichuan Liao,&nbsp;Nan Jiang","doi":"10.1002/qute.202570001","DOIUrl":"https://doi.org/10.1002/qute.202570001","url":null,"abstract":"<p>As a fusion improvement algorithm for convolution neural networks and recurrent neural networks, CNN-BiLSTM demonstrates its powerful fitting ability and generalization ability for complex data. In article number 2400373, Nan Jiang and co-workers combine this algorithm with quantum entanglement classification problems, achieving perfect performance for nearly all 2-qubits quantum 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 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114332","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. 1/2025)","authors":"","doi":"10.1002/qute.202570002","DOIUrl":"https://doi.org/10.1002/qute.202570002","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114144","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":"Effect and Compensation of Polarization-Dependent Loss in Free-Space Reference Frame Independent Quantum Key Distribution","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.202400492","DOIUrl":"https://doi.org/10.1002/qute.202400492","url":null,"abstract":"<p>Polarization-dependent loss (PDL) poses a critical challenge in implementing free-space quantum key distribution (QKD) systems. This study investigated the theoretical and experimental impact of PDL on polarization-encoded qubits and experimentally demonstrated a method to mitigate these effects. The proposed compensation method could effectively restore the integrity of polarization states, enhancing the robustness and security of QKD systems. Specifically, a secret key rate of 94.01% could be recovered with 5 dB PDL. This study contributes to advancing scalable and secure quantum communication technologies by addressing the critical issue of PDL in QKD systems.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400492","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622360","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":"Quantum Network Infrastructure","authors":"Lisa Wörner,&nbsp;Kai Bongs,&nbsp;Stefanie Bremer,&nbsp;Philipp Kleinpaß,&nbsp;Florian Moll,&nbsp;Davide Orsucci,&nbsp;Jaspar Meister,&nbsp;Jan-Michael Mol","doi":"10.1002/qute.202300415","DOIUrl":"https://doi.org/10.1002/qute.202300415","url":null,"abstract":"<p>Global quantum state distribution has applications in many areas, one of which is global key distribution for secure communications in an era of the threat of quantum computing. Long-distance quantum key distribution requires a global network of optical relay stations, ground stations, and quantum memories. In this study, why quantum memories should be operated in space as untrusted nodes is presented. In addition to quantum key distribution, quantum memories in space are an enabling technology for distributed quantum sensor systems. The requirements for distributed sensors are outlined and the current technology readiness level of relevant systems is referenced. Finally, the possibility of an emerging quantum internet, enabling the coherent combination of quantum computers around the world, is addressed.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202300415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389373","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. 12/2024)","authors":"","doi":"10.1002/qute.202470038","DOIUrl":"https://doi.org/10.1002/qute.202470038","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"7 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868355","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":"Front Cover: Laser Beam Induced Charge Collection for Defect Mapping and Spin State Readout in Diamond (Adv. Quantum Technol. 12/2024)","authors":"Dominic Reinhardt,&nbsp;Julia Heupel,&nbsp;Cyril Popov,&nbsp;Ralf Wunderlich","doi":"10.1002/qute.202470035","DOIUrl":"https://doi.org/10.1002/qute.202470035","url":null,"abstract":"<p>Photocurrents in wide bandgap materials provide valuable insights into the dynamics of intrinsic defects. In article number 2400237, Ralf Wunderlich and co-workers use a commercially available charge integrator IC with switchable input on a printed circuit board (cover image) for low-noise current measurements with a resolution of about 100 fA. Thus, the authors can image and detect small numbers of individual defects in ultrapure diamond. Furthermore, the authors conduct photocurrent-detected magnetic resonance (PDMR) on NV centers. The work paves the way for low-cost, miniaturized, simple and time-resolved photocurrent measurements of solid-state defects.\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 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868346","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: Purity-Assisted Zero-Noise Extrapolation for Quantum Error Mitigation (Adv. Quantum Technol. 12/2024)","authors":"Tian-Ren Jin,&nbsp;Yun-Hao Shi,&nbsp;Zheng-An Wang,&nbsp;Tian-Ming Li,&nbsp;Kai Xu,&nbsp;Heng Fan","doi":"10.1002/qute.202470037","DOIUrl":"https://doi.org/10.1002/qute.202470037","url":null,"abstract":"<p>Zero noise extrapolation (ZNE) is a method that amplifies and extrapolates noise to a noise-free point. The cover image shows a modified method called purity-assisted ZNE (pZNE). This method enhances the effectiveness of ZNE by accumulating the noises with the forward and backward evolutions to extrapolate the ideal expectation from noisy expectations along the purity of the noisy output state to the ideal pure state. For further details, see article number 2400150 by Kai Xu, Heng Fan, 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 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868348","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":"Inside Front Cover: Numerical Investigation of a Coupled Micropillar - Waveguide System for Integrated Quantum Photonic Circuits (Adv. Quantum Technol. 12/2024)","authors":"Léo J. Roche,&nbsp;Fridtjof Betz,&nbsp;Yuhui Yang,&nbsp;Imad Limame,&nbsp;Ching-Wen Shih,&nbsp;Sven Burger,&nbsp;Stephan Reitzenstein","doi":"10.1002/qute.202470036","DOIUrl":"https://doi.org/10.1002/qute.202470036","url":null,"abstract":"<p>This cover image is the 3D rendering of a quantum photonic device concept consisting of a whispering gallery mode microlaser coupled to a ridge waveguide. Such a device could potentially be used to resonantly excite a single-photon emitter that is subsequently integrated into a ridge waveguide. This allows for on-chip and on-demand generation of single photons in the context of integrated quantum photonic circuits. In article number 2400195, Stephan Reitzenstein and co-workers use finite element simulations to investigate the resonance quality of the cavity and its coupling efficiency.\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 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868347","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":"A Fully-Integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity","authors":"Yulin Dai,&nbsp;Wenhui Tian,&nbsp;Qing liu,&nbsp;Bao Chen,&nbsp;Yushan Liu,&nbsp;Qidi Hu,&nbsp;Zheng Ma,&nbsp;Yunpeng Zhai,&nbsp;Haodong Wang,&nbsp;Ying Dong,&nbsp;Nanyang Xu","doi":"10.1002/qute.202300438","DOIUrl":"https://doi.org/10.1002/qute.202300438","url":null,"abstract":"<p>Ensemble diamond nitrogen-vacancy (DNV) centers have emerged as a promising platform for precise earth-field vector magnetic sensing, particularly in applications that require high mobility. Nevertheless, integrating all control utilities into a compact form has proven challenging, thus far limiting the sensitivity of mobile DNV magnetometers to the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μ</mi>\u0000 <mi>T</mi>\u0000 </mrow>\u0000 <annotation>$mu{rm T}$</annotation>\u0000 </semantics></math>-level. This study introduces a fully integrated DNV magnetometer that encompasses all the essential components typically found in traditional platforms, while maintaining compact dimensions of approximately <span></span><math>\u0000 <semantics>\u0000 <mi>Φ</mi>\u0000 <annotation>$Phi$</annotation>\u0000 </semantics></math> 13 cm <span></span><math>\u0000 <semantics>\u0000 <mo>×</mo>\u0000 <annotation>$times$</annotation>\u0000 </semantics></math> 26 cm. In contrast to previous efforts, these challenges are successfully addressed by integrating a high-power laser, a lock-in amplifier, and a digitally-modulated microwave source. These home-made components show comparable performance with commercial devices under the circumstance, resulting in an optimal sensitivity approaching 2.14 nT (<span></span><math>\u0000 <semantics>\u0000 <msqrt>\u0000 <mrow>\u0000 <mi>H</mi>\u0000 <mi>z</mi>\u0000 </mrow>\u0000 </msqrt>\u0000 <annotation>$sqrt {Hz}$</annotation>\u0000 </semantics></math>)⁻¹. The limitations in this system as well as possible future improvements are discussed. This work paves the way for the use of DNV magnetometry in cost-effective, mobile unmanned aerial vehicles, facilitating a wide range of practical applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793631","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}