Advanced quantum technologies最新文献_第6页

PT $mathcal {PT}$ -Symmetric Quantum Rabi Model: Solutions and Exceptional Points PT $mathcal {PT}$ -对称量子Rabi模型：解和例外点

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-17 DOI: 10.1002/qute.202400609

Jiong Li, Yi-Cheng Wang, Li-Wei Duan, Qing-Hu Chen

{"title":"PT\u0000 $mathcal {PT}$\u0000 -Symmetric Quantum Rabi Model: Solutions and Exceptional Points","authors":"Jiong Li, Yi-Cheng Wang, Li-Wei Duan, Qing-Hu Chen","doi":"10.1002/qute.202400609","DOIUrl":"https://doi.org/10.1002/qute.202400609","url":null,"abstract":"The <math>\u0000 <semantics>\u0000 <mi>PT</mi>\u0000 <annotation>$mathcal {PT}$</annotation>\u0000 </semantics></math>-symmetric non-Hermitian quantum Rabi model (QRM) with imaginary coupling is solved using the Bogoliubov operators approach. A transcendental function responsible for the exact solutions is derived, with its zeros yielding the regular spectrum. Two types of intersections: the exceptional points (EPs), which are well-studied in the non-Hermitian system; and another arising from doubly degenerate states due to the conserved QRM parity, which is well-known in the Hermitian QRM, are found. These intersections are identified through this transcendental function. EPs emerge between pairs of adjacent excited energy levels, shifting toward lower coupling strengths as energy levels increase, and can also be predicted by a generalized rotating-wave approximation approach. The fidelity susceptibility diverges to negative infinity at the EPs, consistent with recent findings in non-Hermitian systems, while it diverges to positive infinity at the doubly degenerate points. The EPs are further confirmed by the vanishing c-product in the biorthogonal basis.","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273475","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

Zero-Position Closed-Loop Control of Nuclear Spin in a K-Rb- 21 Ne $^{21}{rm Ne}$ Comagnetometer K-Rb- 21ne $^{21}{rm Ne}$ comneometer中核自旋的零位置闭环控制

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-17 DOI: 10.1002/qute.202400432

Longyan Ma, Hongyu Pei, Lihong Duan, Xiaohan Ge, Wenfeng Fan, Wei Quan

{"title":"Zero-Position Closed-Loop Control of Nuclear Spin in a K-Rb-\u0000 \u0000 \u0000 \u0000 \u0000 21\u0000 \u0000 Ne\u0000 \u0000 $^{21}{rm Ne}$\u0000 Comagnetometer","authors":"Longyan Ma, Hongyu Pei, Lihong Duan, Xiaohan Ge, Wenfeng Fan, Wei Quan","doi":"10.1002/qute.202400432","DOIUrl":"https://doi.org/10.1002/qute.202400432","url":null,"abstract":"In SERF (spin-exchange relaxation-free) comagnetometers, the fluctuation of the atomic ensemble's polarization significantly impacts the long-term stability of the output signal. A real-time closed-loop control method for the nuclear spin polarization is proposed, and the measurement model is established using Kalman state observer. Furthermore, magnetic field control signals are generated using a proportional-integral-derivative (PID) strategy, which is then applied to the atomic ensemble to dynamically adjust the nuclear spin polarization. Finally, closed-loop control of nuclear spin polarization is achieved through continuous feedback and control. Moreover, experiments have demonstrated that implementing a closed-loop system for nuclear spin zero-position is conducive to reducing the sensitivity of the output signal to fluctuations in the external environment. The experimental results show that the Allan deviation at 100 s is reduced by <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>44.3</mn>\u0000 <mo>%</mo>\u0000 </mrow>\u0000 <annotation>$44.3%$</annotation>\u0000 </semantics></math>, and the sensitivity of inertial rotation measurement is significantly improved, that is, the noise level at 1 Hz is suppressed by approximately <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>60</mn>\u0000 <mo>%</mo>\u0000 </mrow>\u0000 <annotation>$60%$</annotation>\u0000 </semantics></math>.","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 7","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635354","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: Effect and Compensation of Polarization-Dependent Loss in Free-Space Reference Frame Independent Quantum Key Distribution (Adv. Quantum Technol. 3/2025) 封面：自由空间参照系独立量子密钥分配中极化相关损耗的影响与补偿（ad . Quantum technology . 3/2025）

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-12 DOI: 10.1002/qute.202570006

Kyongchun Lim, Byung-Seok Choi, Ju Hee Baek, Minchul Kim, Joong-Seon Choe, Kap-Joong Kim, Dong Churl Kim, Junsang Oh, Chun Ju Youn

引用次数: 0

Issue Information (Adv. Quantum Technol. 3/2025) 发行资料（Adv. Quantum technology . 3/2025）

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-12 DOI: 10.1002/qute.202570007

引用次数: 0

Violation of No-Signaling on a Public Quantum Computer 违反公共量子计算机上的无信令

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-04 DOI: 10.1002/qute.202400661

Tomasz Rybotycki, Tomasz Białecki, Josep Batle, Adam Bednorz

引用次数: 0

Learning the Expressibility of Quantum Circuit Ansatz Using Transformer 利用变压器学习量子电路的可表达性

IF 4.4

Advanced quantum technologies Pub Date : 2025-03-04 DOI: 10.1002/qute.202400366

Fei Zhang, Jie Li, Zhimin He, Haozhen Situ

{"title":"Learning the Expressibility of Quantum Circuit Ansatz Using Transformer","authors":"Fei Zhang, Jie Li, Zhimin He, Haozhen Situ","doi":"10.1002/qute.202400366","DOIUrl":"https://doi.org/10.1002/qute.202400366","url":null,"abstract":"With the exponentially faster computation for certain problems, quantum computing has garnered significant attention in recent years. Variational quantum algorithms are crucial methods to implement quantum computing, and an appropriate task-specific quantum circuit ansatz can effectively enhance the quantum advantage of VQAs. However, the vast search space makes it challenging to find the optimal task-specific ansatz. Expressibility, quantifying the diversity of quantum circuit ansatz states to explore the Hilbert space effectively, can be used to evaluate whether one ansatz is superior to another. In this work, using a transformer model to predict the expressibility of quantum circuit ansatze is proposed. A dataset containing random PQCs generated by the gatewise pipeline, with varying numbers of qubits and gates is constructed. The expressibility of the circuits is calculated using three measures: KL divergence, relative KL divergence, and maximum mean discrepancy. A transformer model is trained on the dataset to capture the intricate relationships between circuit characteristics and expressibility. Four evaluation metrics are employed to assess the performance of the transformer. Numerical results demonstrate that the trained model achieves high performance and robustness across various expressibility measures. This research can enhance the understanding of the expressibility of quantum circuit ansatze and advance quantum architecture search algorithms.","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273275","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

Light-Cone Feature Selection for Quantum Machine Learning 量子机器学习的光锥特征选择

IF 4.4

Advanced quantum technologies Pub Date : 2025-02-28 DOI: 10.1002/qute.202400647

Yudai Suzuki, Rei Sakuma, Hideaki Kawaguchi

{"title":"Light-Cone Feature Selection for Quantum Machine Learning","authors":"Yudai Suzuki, Rei Sakuma, Hideaki Kawaguchi","doi":"10.1002/qute.202400647","DOIUrl":"https://doi.org/10.1002/qute.202400647","url":null,"abstract":"Feature selection plays an essential role in improving the predictive performance and interpretability of trained models in classical machine learning. On the other hand, the usability of conventional feature selection can be limited for quantum machine learning (QML) tasks; the technique may not provide a clear interpretation on embedding quantum circuits for classical data tasks and, more importantly, is not applicable to quantum data tasks. In this work, a feature selection method is proposed with a specific focus on QML. This scheme treats the light-cones (i.e., subspace) of quantum models as features and then select relevant ones through training of the corresponding local quantum kernels. Its versatility is numerically demonstrated for four different applications using toy tasks: (1) feature selection of classical inputs, (2) circuit architecture search for data embedding, (3) compression of quantum machine learning models and (4) subspace selection for quantum data. The proposed framework paves the way toward applications of QML to practical tasks. Also, this technique could be used to practically test if the QML tasks really need quantumness, while it is beyond the scope of this work.","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273273","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

Terahertz Continuous-Variable Measurement-Device-Independent Quantum key Distribution with Photon Subtraction in Inter-Satellite Links Communication 卫星间链路通信中光子减法的太赫兹连续变测量设备无关量子密钥分配

IF 4.4

Advanced quantum technologies Pub Date : 2025-02-24 DOI: 10.1002/qute.202400570

Chengji Liu, Zhe Xu, Xinyu Wan, Mengyao Hou, Lu Wang, Qingshan Li

引用次数: 0

Efficient Simulation of Open Quantum Systems on NISQ Trapped-Ion Hardware 开放量子系统在NISQ捕获离子硬件上的高效模拟

IF 4.3

Advanced quantum technologies Pub Date : 2025-02-19 DOI: 10.1002/qute.202400606

Colin Burdine, Nora Bauer, George Siopsis, Enrique P. Blair

{"title":"Efficient Simulation of Open Quantum Systems on NISQ Trapped-Ion Hardware","authors":"Colin Burdine, Nora Bauer, George Siopsis, Enrique P. Blair","doi":"10.1002/qute.202400606","DOIUrl":"https://doi.org/10.1002/qute.202400606","url":null,"abstract":"Simulating open quantum systems, which interact with external environments, presents significant challenges on noisy intermediate-scale quantum (NISQ) devices due to limited qubit resources and noise. In this study, an efficient framework is proposed for simulating open quantum systems on NISQ hardware by leveraging a time-perturbative Kraus operator representation of the system's dynamics. This approach avoids the computationally expensive Trotterization method and exploits the Lindblad master equation to represent time evolution in a compact form, particularly for systems satisfying specific commutation relations. The efficiency of this method is demonstrated by simulating quantum channels, such as the continuous-time Pauli channel and damped harmonic oscillators, on NISQ trapped-ion hardware, including IonQ Harmony and Quantinuum H1-1. Additionally, hardware-agnostic error mitigation techniques are introduced, including Pauli channel fitting and quantum depolarizing channel inversion, to enhance the fidelity of quantum simulations. These results show strong agreement between the simulations on real quantum hardware and exact solutions, highlighting the potential of Kraus-based methods for scalable and accurate simulation of open quantum systems on NISQ devices. This framework opens pathways for simulating more complex systems under realistic conditions in the near term.","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400606","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057945","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

Preparation of High-Fidelity Entangled Cat States with Composite Pulses 复合脉冲制备高保真纠缠态

IF 4.3

Advanced quantum technologies Pub Date : 2025-02-17 DOI: 10.1002/qute.202400518

Ge-Ge Gu, Dong-Sheng Li, Ye-Hong Chen, Bi-Hua Huang, Yan Xia

引用次数: 0