Quantum simulation and computing traditionally has been based on two main paradigms, namely, digital and analog. In the digital paradigm, usually single and two-qubit gates (where qubit is an acronym for quantum bit) are employed as building blocks for scalable, universal quantum computing, although errors add up fast and error correction will be ultimately needed for scaling up. In the analog paradigm, large analog blocks are normally employed for a unitary dynamics that carries out the computation, enabling quantum operations on many qubits with reduced errors, but with the drawback of a limited choice of evolutions and lack of universality. In the past decade, a new paradigm has emerged, showing interesting possibilities for quantum simulation and computing in the near and mid term. This is the paradigm of digital-analog quantum technologies, which proposes to combine the best of both paradigms: large analog blocks, provided by native interactions of the employed quantum platform, enabling scalability, combined with digital gates, allowing for more versatility and, ultimately, universality. In this Perspective, I give an overview of the evolution of the field along the past decade, and an outlook for its future possibilities.
University of the Basque Country UPV/EHU（巴斯克大学）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯基奎巴斯克科学基金会）；Basque Center for Applied Mathematics (BCAM)（巴斯克应用数学中心）
An Analog Analogue of a Digital Quantum Computation
我们解决了一个问题，虽然不适合通常的范式，但可以被视为量子计算。假设我们给定一个由N维希尔伯特空间描述的量子系统，其哈密顿量为$E |w >< w|$，其中$| w>$是未知（归一化）态。我们展示了如何发现$| w >$通过添加一个哈密尔顿（独立的$| w >$）和发展成正比的时间$N^{1/2}/E$。我们表明，这个时间是最佳的短。这个过程是Grover算法的一个模拟类似物，一个传统的（！）一种量子计算机，其以与$N^{1/2}$成比例的多个步骤从N个项目的未排序列表中定位标记项目。
Impact and mitigation of Hamiltonian characterization errors in digital-analog quantum computation
TECNALIA, Basque Research and Technology Alliance (BRTA)（特克纳利亚，巴斯克研究与技术联盟）；University of the Basque Country UPV/EHU（巴斯克大学）；EHU Quantum Center（EHU量子中心）；Max-Planck-Institut für Quantenoptik（马克斯·普朗克光学研究所）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；University of Vienna（维也纳大学）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯基，巴斯克科学基金会）；Basque Center for Applied Mathematics (BCAM)（巴斯克应用数学中心）
Measurement-free Preparation of Surface-Code States with Digital-Analog Counterdiabatic Drivings
Intelligent Data Analysis Laboratory (IDAL), Departament d’Enginyeria Electrònica, ETSE-UV, Universitat de València（瓦伦西亚大学电子工程系智能数据分析实验室）；Kipu Quantum（基普量子）
Hybrid digital-analog protocols for simulating quantum multi-body interactions
Cornell University（康奈尔大学）；University of Maryland（马里兰大学）；NIST（美国国家标准与技术研究院）；Joint Center for Quantum Information and Computer Science, NIST/University of Maryland（量子信息与计算联合中心，美国国家标准与技术研究院/马里兰大学）；Joint Quantum Institute, NIST/University of Maryland（量子联合研究所，美国国家标准与技术研究院/马里兰大学）；Duke University（杜克大学）；King's College London（伦敦国王学院）
