Quantum computer is a new type of physical device for the operation, storage and processing of quantum information, which is based on quantum properties, such as superposition and entanglement. By running quantum algorithms based on quantum hardware, quantum computers are capable to solve certain complex computational problems much faster and more efficiently than classical computers. Hence, quantum computers play a crucial role in the future science and technology development, international strategic competition and other aspects. Trapped ion is one of the main physical platforms to construct quantum computer. This paper introduces the development and trends of trapped ion quantum computers. Firstly, by reviewing the historical development of trapped ion quantum computing, this paper reviewed the principle, status, and trend of trapped ion quantum computers. Then, the paper focuses on the research frontier of distributed trapped ion quantum computer, and analyzes technical topics, such as ion-photon entanglement, distributed quantum computing, and quantum internet based on trapped-ions. Further, the development of the industry of trapped ion quantum computing is discussed, including core patents, research institutions, enterprises, and financing, as well as marketing and ecology. Finally, the paper provides suggestions for scientific research and industrial development of trapped ion quantum computers.

Quantum science and technology will have a significant impact on society and economy. Many countries/regions have proposed strategic plans for quantum science and technology, taking quantum as an important direction of science and technology development, increasing research and   development investment and occupying commanding heights. This paper makes an in-depth analysis on the innovation strategies of quantum science and technology in main countries/regions. First, we investigate the quantum science and technology strategic plans of main countries/regions, including the United States, the European Union, the United Kingdom, Japan and Russia, to analyze their strategic layout characteristics and specific measures. Second, we analyze the strategic coordination and organizational mechanism in the United States and the European Union. Then, the special quantum research institutions established in recent years are summarized, and the measures taken by these institutions to accelerate the research and innovation of quantum information science are analyzed. After that, the development status of quantum science and technology in China is summarized. Finally, the paper puts forward suggestions for the innovation and development of quantum science and technology in China, including formulating special strategic plans, optimizing overall management mechanism, promoting quantum alliance and building industrial ecosystem, strengthening quantum discipline construction and cultivating quantum professionals.

Strategic layout and main research directions of quantum sensing, an important branch of quantum information science, are explored by combining bibliometrics and typical survey methods. Research shows that quantum sensing has developed rapidly in the past decade, with the number of publications and the number of researchers increasing rapidly, and the popularity of research continues to rise. 1) Macro level: The United States, Germany, China, Japan and Britain compete fiercely, and the United States, Germany, Britain and Japan have successively launched national strategic plans to guide related research. 2) Meso level: The Ulm University, Massachusetts Institute of Technology, and University of Science and Technology of China rank among the top three in terms of the number of publications, whlie Ulm University, Harvard University and Massachusetts Institute of Technology are at the core of the cooperation network of institutions. The main institutions represented by Ulm University pay more attention to the research of solid single-photon sources, and to interdisciplinary and scientific research cooperation. 3) Research direction evolution: Quantum sensing based on cold atom systems has maintained a high degree of research interest in the past decade, while quantum sensing based on solid-state single-photon sources has rapidly become a research hotspot.

As one of the important development directions of quantum information technology, quantum sensing and measurement can realize leapfrog ultra-high precision measurement and resist noise interference in specific environments, which has broad development and application prospects in important fields such as geological survey, space exploration, inertial guidance and material analysis. IThis paper compares the important strategic planning and project deployment in the field of quantum sensing and measurement in Europe and the United States in recent years, and provides in-depth analysis of the current situation and trends in the development of five major subfields of quantum sensing and measurement. Finally, this paper puts forward suggestions for the development of quantum sensing and measurement in China, including: relying on the national laboratory, clarifying the technology development path, laying out key core research directions;establishing a cooperation platform and mechanism, and promoting industrialization; paying attention to talent training and long-term support for basic research, etc.

The realization of quantum computing will create unparalleled computing capabilities, which will be much faster than classical computing when it comes to solving certain problems. Because the potential military and commercial applications of quantum computing could be nearly endless, it has become a strategic area for many countries. In this paper, comparative analyses were conducted in terms of policies and research and development (R&D) status in the field of quantum computing in China and the United States, aiming to provide reference for advancing the development of quantum computing in China. First of all, we analyzed the important scientific and technological planning of quantum computing in recent years: the United States attaches importance to strategic deployment and top-level design, and effectively leverages national strategic strengths in science and technology; quantum computing has attracted a high level of attention at the national strategic level in China, and support for relevant science and technology plans has been gradually increased. Further more, in the present study, LDA, i.e., Latent Dirichlet Allocation, topic model was utilized to conduct text mining based paper data, and we analyzed and compared differences between China and the United States in fundamental research on quantum computing. Then, we introduced the latest progress of quantum computing industry in China and the United States: the quantum computing industry in the United States is developing rapidly, while slightly weak in China. Finally, some suggestions were putted forward to advance the future innovative development of quantum computing in China : to strengthen top-level strategic planning to guide the rapid development of quantum computing; give play to the leading role of the superiority technology, evaluate key technical problems for the future, and to provide focused support for these key technical problems; to build a quantum computing R&D ecosystem, and to promote the development of quantum computing industry; to advance research on military-civil fusion and ensure our national security. 

Quantum technology will play an important role in the future social and economic development. EU launched the Quantum Technologies Flagship and proposed the Strategic Research Agenda on Quantum technologies , to accelerated the commercial application of quantum research. In this paper, we analyze development process of the EU Quantum Flagship, the challenges and roadmaps of four application fields, scientific and technological resources and innovation ecosystem, to reveal the development strategy of EU quantum technology. First, the development of Quantum Flagship is summarized. Second, the challenges and roadmaps of four application fields, including communication, computing, simulation, sensing and metrology, are analyzed. Third, we analyze the scientific resources and technological resources that support the implementation of Quantum Flagship. Then, we analyze the challenges and measures of the EU to create an innovation ecosystem from four aspects, which are defining the use cases and requirement specifications of quantum technology, providing infrastructure and supply chain, promoting the development of new products and services, education and training. Finally, we propose suggestions for the development of quantum technology in China, including creating roadmaps of quantum technology, optimizing scientific and technological resources, creating an innovation ecosystem, accelerating the commercial application of quantum technology, speeding up the definition of quantum communication standards, and developing the education and training. 

Quantum technology is a frontier field that has a strong industrial vision and is related to the development of national strategies. Increasing countries or regions have included the development of quantum technology in their national key strategies. Understanding the relevant policy formulation and scientist information of the quantum technology development power can give a glimpse of some of the characteristics of quantum powers in policy formulation, and can also provide a reference for predicting the next step of policy formulation. This article combs the development track of quantum policies in the EU and the United States, focusing on the latest major strategic deployments and related scientists who influence policy formulation. By comparing with our own situation, this paper proposes several suggestions for the formulation of our country’s quantum technology policy: speed up the top-level design of the national strategy, promote the development of the quantum industry through national projects, build an echelon of quantum technology talents and so on.