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Planar ion chip design for scalable quantum information processing

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Chinese Physics B 2008年第10期17卷 3565-3573页

作者：万金银王育竹刘亮 Key Laboratory for quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

We investigate a planar ion chip design with a two-dimensional array of linear ion traps for scalable quantum information processing. Qubits are formed from the internal electronic states of trapped ^40Ca^＋ ions. The segmented electrodes reside in a single plane on a substrate and a grounded metal plate separately, a combination of appropriate rf and DC potentials is applied to them for stable ion confinement. Every two adjacent electrodes can generate a linear ion trap in and between the electrodes above the chip at a distance dependent on the geometrical scale and other considerations. The potential distributions are calculated by using a static electric field qualitatively. This architecture provides a conceptually simple avenue to achieving the microfabrication and large-scale quantum computation based on the arrays of trapped ions.

关键词： ion traps ion chip quantum information processing

Single-photon source with sub-MHz linewidth for cesium-based quantum information processing

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Frontiers of physics 2023年第6期18卷 275-281页

作者： Hai He Peng-Fei Yang Peng-Fei Zhang Gang Li Tian-Cai Zhang State Key Laboratory of quantum Optics and quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

A single-photon source with narrow bandwidth,high purity,and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information ***,we experimentally demonstrate a degenerate doubly resonant single-photon source at 852 nm by the cavity-enhanced spontaneous parametric downconversion process with a 100%duty cycle of *** single photon source possesses both high purity with a second-order correlation g^((2))_(h)(0)=0.021 and narrow linewidth with△_(V_(sp))=(800±13)*** single-photon s Single-photon source with sub-MHz linewidth for cesium-based quantum information processingource is compatible with the cesium atom D2 line and can be used for cesium-based quantum information processing Single-photon source with sub-MHz linewidth for cesium-based quantum information processing0.021.

关键词： single-photon source sub-MHz linewidth few longitudinal modes quantum information processing

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Established conversions for hybrid entangled states assisted by error-predicted parity-discriminated devices

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Chinese Physics B 2025年第1期34卷 72-78页

作者： Fang-Fang Du Zhi-Guo Fan Xue-Mei Ren Ming Ma Wen-Yao Liu Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China

Hybrid entangled states are crucial in quantum physics,offering significant benefits for hybrid quantum communication and quantum computation,and then the conversion of hybrid entangled states is equally *** paper presents two novel schemes,that is,one converts the two-qubit hybrid Knill–Laflamme–Milburn(KLM)entangled state into Bell states and the other one transforms the three-qubit hybrid KLM state into Greenberger–Horne–Zeilinger(GHZ)states assisted by error-predicted and parity-discriminated ***,the integration of single photon detectors into the parity-discriminated device enhances predictive capabilities,mitigates potential failures,and facilitates seamless interaction between the nitrogen-vacancy center and photons,so the two protocols operate in an error-predicted way,improving the experimental ***,our schemes demonstrate robust fidelities(close to 1)and efficiencies,indicating their feasibility with existing technology.

关键词： quantum information processing quantum entanglement quantum communication entanglement conversion

Three-dimensional quantum wavelet transforms

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Frontiers of Computer Science 2023年第5期17卷 227-240页

作者： Haisheng LI Guiqiong LI Haiying XIA College of Electronic and information Engineering Guangxi Normal UniversityGuilin 541004China

Wavelet transform is being widely used in the field of information ***-dimension and two-dimension quantum wavelet transforms have been investigated as important tool ***,three-dimensional quantum wavelet transforms have not been *** paper proposes a multi-level three-dimensional quantum wavelet transform theory to implement the wavelet transform for quantum ***,we construct the iterative formulas for the multi-level three-dimensional Haar and Daubechies D4 quantum wavelet transforms,***,we design quantum circuits of the two wavelet transforms using iterative *** analysis shows that the proposed wavelet transforms offer exponential speed-up over their classical ***,the proposed quantum wavelet transforms are selected to realize quantum video compression as a primary *** results reveal that the proposed wavelet transforms have better compression performance for quantum videos than two-dimension quantum wavelet transforms.

关键词： wavelet transform wavelet video coding quantum wavelet transform quantum information processing quantum image processing

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quantum information procession with fermions based on charge detection

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Chinese Physics B 2009年第12期18卷 5155-5160页

作者：唐莉 Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China

This paper proposes a fermionic linear optical scheme for the teleportation and entanglement concentration via entanglement swapping based on charge detection. It also proves that this method is useful in generating entangled states such as GHZ states, W states, and cluster states by using fermionic polarizing beam splitters and single spin rotations assisted by a parity check on the fermionic qubits. This scheme is nearly deterministic （i.e., with 100% successful probability） and does not need the joint Bell state measurement required in the previous schemes.

关键词： quantum information processing charge detection

Fidelity between Gaussian mixed states with quantum state quadrature variances

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Chinese Physics B 2016年第4期25卷 57-62页

作者：张海龙周淳史建红鲍皖苏 Zhengzhou information Science and Technology Institute Zhengzhou 450004 China Synergetic Innovation Center of quantum information and quantum Physics University of Science and Technology of China Hefei 230026 China Science and Technology on information Assurance Laboratory Beijing 100071 China

In this paper, from the original definition of fidelity in a pure state, we first give a well-defined expansion fidelity between two Gaussian mixed states. It is related to the variances of output and input states in quantum information pro- cessing. It is convenient to quantify the quantum teleportation （quantum clone） experiment since the variances of the input （output） state are measurable. Furthermore, we also give a conclusion that the fidelity of a pure input state is smaller than the fidelity of a mixed input state in the same quantum information processing.

关键词： fidelity mixed state quantum clone quantum information processing

Towards quantum-enhanced precision measurements:Promise and challenges

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Chinese Physics B 2013年第11期22卷 46-51页

作者：张利剑肖敏 College of Engineering and Applied Sciences Nanjing University Department of Physics University of Arkansas Fayetteville

quantum metrology holds the promise of improving the measurement precision beyond the limit of classical ap- proaches. To achieve such enhancement in performance requires the development of quantum estimation theories as well as novel experimental techniques. In this article, we provide a brief review of some recent results in the field of quantum metrology. We emphasize that the unambiguous demonstration of the quantum-enhanced precision needs a careful analysis of the resources involved. In particular, the implementation of quantum metrology in practice requires us to take into ac- count the experimental imperfections included, for example, particle loss and dephasing noise. For a detailed introduction to the experimental demonstrations of quantum metrology, we refer the reader to another article ＇quantum metrology＇ in the same issue.

关键词： quantum metrology quantum information processing

Progress and prospects of Moiré superlattices in twisted TMD heterostructures

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Nano Research 2024年第11期17卷 10134-10161页

作者： Syed Jamal Shah Junying Chen Xing Xie Xinyu Oyang Fangping Ouyang Zongwen Liu Jian-Tao Wang Jun He Yanping Liu Institute of quantum Physics School of Physics Central South University Changsha 410083 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University Changsha 410083 China School of Physics and Technology State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang University Urumqi 830046 China School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia The University of Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan 523808 China

Moiré superlattices based on twisted transition metal dichalcogenide (TMD) heterostructures have recently emerged as a promising platform for probing novel and distinctive electronic phenomena in two-dimensional (2D) materials. By stacking TMD monolayers with a small twist angle, these superlattices create a periodic modulation of the electronic density of states, leading to the formation of mini bands. These mini bands can exhibit intriguing properties such as flat bands, correlated electron behavior, and unconventional superconductivity. This review provides a comprehensive overview of recent progress in Moiré superlattices formed from twisted TMD heterostructures. It covers the theoretical principles and experimental techniques for creating and studying these superlattices, and explores their potential applications in optoelectronics, quantum computing, and energy harvesting. The review also addresses key challenges, such as improving the scalability and reproducibility of the fabrication process, emphasizing the exciting opportunities and ongoing hurdles in this rapidly evolving field.

关键词： Moirésuperlattices twisted transition metal dichalcogenides heterostructures electronic properties optical properties transport properties valleytronics optoelectronics quantum information processing

quantum Correlations Evolution Asymmetry in quantum Channels

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Communications in Theoretical Physics 2017年第3期67卷 267-272页

作者：李萌黄运锋郭光灿 Key Laboratory of quantum information University of Science and Technology of China CAS Hefei 230026 China Synergetie Innovation Center of quantum information and quantum Physics University of Science and Technology of China Hefei 230026 China

It was demonstrated that the entanglement evolution of a specially designed quantum state in the bistochastic channel is asymmetric. In this work, we generalize the study of the quantum correlations, including entanglement and quantum discord, evolution asymmetry to various quantum channels. We found that the asymmetry of entanglement and quantum discord only occurs in some special quantum channels, and the behavior of the entanglement evolution may be quite different from the behavior of the quantum discord evolution. To quantum entanglement, in some channels it decreases monotonously with the increase of the quantum channel intensity. In some other channels, when we increase the intensity of the quantum channel, it decreases at first, then keeps zero for some time, and then rises up. To quantum discord, the evolution becomes more complex and you may find that it evolutes unsmoothly at some points. These results illustrate the strong dependence of the quantum correlations evolution on the property of the quantum channels.

关键词： quantum information processing quantum correlations evolution asymmetry various quantum channels