npj Quantum Information最新文献_第6页

Observation of multiple steady states with engineered dissipation 工程耗散下的多重稳态观测

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-07 DOI: 10.1038/s41534-025-00958-6

Li Li, Tong Liu, Xue-Yi Guo, He Zhang, Silu Zhao, Zheng-An Wang, Zhongcheng Xiang, Xiaohui Song, Yu-Xiang Zhang, Kai Xu, Heng Fan, Dongning Zheng

引用次数: 0

A mid-circuit erasure check on a dual-rail cavity qubit using the joint-photon number-splitting regime of circuit QED 利用电路QED的联合光子数分裂机制对双轨道腔量子比特的中路擦除检查

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-07 DOI: 10.1038/s41534-024-00944-4

Stijn J. de Graaf, Sophia H. Xue, Benjamin J. Chapman, James D. Teoh, Takahiro Tsunoda, Patrick Winkel, John W. O. Garmon, Kathleen M. Chang, Luigi Frunzio, Shruti Puri, Robert J. Schoelkopf

{"title":"A mid-circuit erasure check on a dual-rail cavity qubit using the joint-photon number-splitting regime of circuit QED","authors":"Stijn J. de Graaf, Sophia H. Xue, Benjamin J. Chapman, James D. Teoh, Takahiro Tsunoda, Patrick Winkel, John W. O. Garmon, Kathleen M. Chang, Luigi Frunzio, Shruti Puri, Robert J. Schoelkopf","doi":"10.1038/s41534-024-00944-4","DOIUrl":"https://doi.org/10.1038/s41534-024-00944-4","url":null,"abstract":"Quantum control of a linear oscillator using a static dispersive coupling to a nonlinear ancilla underpins a wide variety of experiments in circuit QED. Extending this control to more than one oscillator while minimizing the required connectivity to the ancilla would enable hardware-efficient multi-mode entanglement and measurements. We show that the spectrum of an ancilla statically coupled to a single mode can be made to depend on the joint photon number in two modes by applying a strong parametric beamsplitter coupling between them. This ‘joint-photon number-splitting’ regime extends single-oscillator techniques to two-oscillator control, which we use to realize a hardware-efficient erasure check for a dual-rail qubit encoded in two superconducting cavities. This scheme leverages the high-fidelity beamsplitter coupling already required for single- and two-qubit gates while permitting minimal crosstalk between circuit elements. Furthermore, the flexibility to choose the pulse shape allows us to limit the susceptibility to different error channels. We use this scheme to detect leakage errors with a missed erasure fraction of (9.0 ± 0.5) × 10−4 while incurring an erasure rate of 2.92 ± 0.01% and a Pauli error rate of 0.31 ± 0.01%, both of which are dominated by cavity errors.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"82 1 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142934878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient fault-tolerant implementations of non-Clifford gates with reconfigurable atom arrays 具有可重构原子阵列的非clifford门的高效容错实现

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-31 DOI: 10.1038/s41534-024-00945-3

Wang Yifei, Yixu Wang, Yu-An Chen, Wenjun Zhang, Tao Zhang, Jiazhong Hu, Wenlan Chen, Yingfei Gu, Zi-Wen Liu

引用次数: 0

Simulating non-completely positive actions via exponentiation of Hermitian-preserving maps 通过埃尔米特守恒图的幂模拟非完全正动作

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-30 DOI: 10.1038/s41534-024-00949-z

Fuchuan Wei, Zhenhuan Liu, Guoding Liu, Zizhao Han, Dong-Ling Deng, Zhengwei Liu

{"title":"Simulating non-completely positive actions via exponentiation of Hermitian-preserving maps","authors":"Fuchuan Wei, Zhenhuan Liu, Guoding Liu, Zizhao Han, Dong-Ling Deng, Zhengwei Liu","doi":"10.1038/s41534-024-00949-z","DOIUrl":"https://doi.org/10.1038/s41534-024-00949-z","url":null,"abstract":"Legitimate quantum operations must adhere to principles of quantum mechanics, particularly the requirements of complete positivity and trace preservation. Yet, non-completely positive maps, especially Hermitian-preserving maps, play a crucial role in quantum information science. Here, we introduce the Hermitian-preserving map exponentiation algorithm, which can effectively simulate the action of an arbitrary Hermitian-preserving map by exponentiating its output, ({mathcal{N}}(rho )), into a quantum process, ({e}^{-i{mathcal{N}}(rho )t}). We analyze the sample complexity of this algorithm and prove its optimality in certain cases. Utilizing positive but not completely positive maps, this algorithm provides exponential speedups in entanglement detection and quantification compared to protocols based on single-copy operations. In addition, it facilitates the encoding-free recovery of noiseless quantum states from multiple noisy ones by simulating the inverse map of the corresponding noise channel, providing a new approach to handling quantum noises. This algorithm acts as a building block of large-scale quantum algorithms and presents a pathway for exploring potential quantum speedups across a wide range of information-processing tasks.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"55 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-bin entangled Bell state generation and tomography on thin-film lithium niobate 铌酸锂薄膜的时间bin纠缠贝尔态生成与层析成像

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-30 DOI: 10.1038/s41534-024-00925-7

Giovanni Finco, Filippo Miserocchi, Andreas Maeder, Jost Kellner, Alessandra Sabatti, Robert J. Chapman, Rachel Grange

{"title":"Time-bin entangled Bell state generation and tomography on thin-film lithium niobate","authors":"Giovanni Finco, Filippo Miserocchi, Andreas Maeder, Jost Kellner, Alessandra Sabatti, Robert J. Chapman, Rachel Grange","doi":"10.1038/s41534-024-00925-7","DOIUrl":"https://doi.org/10.1038/s41534-024-00925-7","url":null,"abstract":"Optical quantum communication technologies are making the prospect of unconditionally secure and efficient information transfer a reality. The possibility of generating and reliably detecting quantum states of light, with the further need of increasing the private data-rate is where most research efforts are focusing. The physical concept of entanglement is a solution guaranteeing the highest degree of security in device-independent schemes, yet its implementation and preservation over long communication links is hard to achieve. Lithium niobate-on-insulator has emerged as a revolutionising platform for high-speed classical telecommunication and is equally suited for quantum information applications owing to the large second-order nonlinearities that can efficiently produce entangled photon pairs. In this work, we generate maximally entangled quantum states in the time-bin basis using lithium niobate-on-insulator photonics at the fibre optics telecommunication wavelength, and reconstruct the density matrix by quantum tomography on a single photonic integrated circuit. We use on-chip periodically-poled lithium niobate as source of entangled qubits with a brightness of 242 MHz/mW and perform quantum tomography with a fidelity of 91.9 ± 1.0 %. Our results, combined with the established large electro-optic bandwidth of lithium niobate, showcase the platform as perfect candidate to realise fibre-coupled, high-speed time-bin quantum communication modules that exploit entanglement to achieve information security.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"18 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity 具有压缩微波和谐振器非线性的自旋量子比特的快速高保真色散读出

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-28 DOI: 10.1038/s41534-024-00924-8

Chon-Fai Kam, Xuedong Hu

引用次数: 0

Long-range data transmission in a fault-tolerant quantum bus architecture 基于容错量子总线架构的远程数据传输

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-26 DOI: 10.1038/s41534-024-00928-4

Shin Ho Choe, Robert König

引用次数: 0

Quantum networks with coherent routing of information through multiple nodes 具有通过多个节点的相干信息路由的量子网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-20 DOI: 10.1038/s41534-024-00919-5

Hlér Kristjánsson, Yan Zhong, Anthony Munson, Giulio Chiribella

引用次数: 0

Quantum simulation of realistic materials in first quantization using non-local pseudopotentials 利用非局域伪势对现实材料一阶量子化的量子模拟

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-19 DOI: 10.1038/s41534-024-00896-9

Dominic W. Berry, Nicholas C. Rubin, Ahmed O. Elnabawy, Gabriele Ahlers, A. Eugene DePrince, Joonho Lee, Christian Gogolin, Ryan Babbush

{"title":"Quantum simulation of realistic materials in first quantization using non-local pseudopotentials","authors":"Dominic W. Berry, Nicholas C. Rubin, Ahmed O. Elnabawy, Gabriele Ahlers, A. Eugene DePrince, Joonho Lee, Christian Gogolin, Ryan Babbush","doi":"10.1038/s41534-024-00896-9","DOIUrl":"https://doi.org/10.1038/s41534-024-00896-9","url":null,"abstract":"This paper improves and demonstrates the usefulness of the first quantized plane-wave algorithms for the quantum simulation of electronic structure. We describe our quantum algorithm for first quantized simulation that accurately includes pseudopotentials. We focus on the Goedecker-Tetter-Hutter pseudopotential, and despite its complicated form, we block encode the associated operator without significantly increasing the overall cost of quantum simulation. This is surprising since simulating the nuclear potential is much simpler without pseudopotentials, yet is still the bottleneck. We also generalize prior methods to enable the simulation of materials with non-cubic unit cells, which requires nontrivial modifications. Finally, we combine these techniques to estimate block-encoding costs for commercially relevant instances of heterogeneous catalysis (e.g. carbon monoxide adsorption) and compare to the quantum resources needed to simulate materials in second quantization. We conclude that for computational cells with many particles, first quantization often requires meaningfully less spacetime volume.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"25 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142848912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simultaneous discovery of quantum error correction codes and encoders with a noise-aware reinforcement learning agent 同时发现量子纠错码和编码器与噪声感知强化学习代理

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-03 DOI: 10.1038/s41534-024-00920-y

Jan Olle, Remmy Zen, Matteo Puviani, Florian Marquardt

{"title":"Simultaneous discovery of quantum error correction codes and encoders with a noise-aware reinforcement learning agent","authors":"Jan Olle, Remmy Zen, Matteo Puviani, Florian Marquardt","doi":"10.1038/s41534-024-00920-y","DOIUrl":"https://doi.org/10.1038/s41534-024-00920-y","url":null,"abstract":"In the ongoing race towards experimental implementations of quantum error correction (QEC), finding ways to automatically discover codes and encoding strategies tailored to the qubit hardware platform is emerging as a critical problem. Reinforcement learning (RL) has been identified as a promising approach, but so far it has been severely restricted in terms of scalability. In this work, we significantly expand the power of RL approaches to QEC code discovery. Explicitly, we train an RL agent that automatically discovers both QEC codes and their encoding circuits for a given gate set, qubit connectivity and error model, from scratch. This is enabled by a reward based on the Knill-Laflamme conditions and a vectorized Clifford simulator, showing its effectiveness with up to 25 physical qubits and distance 5 codes, while presenting a roadmap to scale this approach to 100 qubits and distance 10 codes in the near future. We also introduce the concept of a noise-aware meta-agent, which learns to produce encoding strategies simultaneously for a range of noise models, thus leveraging transfer of insights between different situations. Our approach opens the door towards hardware-adapted accelerated discovery of QEC approaches across the full spectrum of quantum hardware platforms of interest.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"46 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142760080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0