Careful filtering is necessary for observations of quantum phenomena in superconducting circuits at low temperatures. Measurements of coherence between quantum states require extensive filtering to protect against noise coupled from room temperature electronics. We demonstrate distributed transmission line filters which cut off exponentially at GHz frequencies and can be anchored at the base te...

Hai Wang,1,* Shujing Li,1 Zhongxiao Xu,1 Xingbo Zhao,1 Lijun Zhang,1 Jiahua Li,1 Yuelong Wu,1 Changde Xie,1 Kunchi Peng,1 and Min Xiao1,2 1The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, People’s Republic of China 2Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA (Received 9 ...

MICHAEL BUTLER and PIETER HARTEL Department of Electronics & Computer Science University of Southampton Southampton SO17 1BJ United Kingdom {mjb,phh}@ecs.soton.ac.uk Grover's search algorithm is designed to be executed on a quantum-mechanical computer. In this paper, the probabilistic wp-calculus is used to model and reason about Grover's algorithm. It is demonstrated that the calculus provides...

With the anticipated end of Moore’s law for integrated circuits [3, 4] fast approaching and continued advances in low-power electronics, interest in quantum computing has increased. This shifts the focus from deterministic logical circuits to potentially more powerful circuits based on controllable quantum systems. In this column, we present a mathematical tour of the quantum circuit model, beg...

Yong-Chun Liu,1 Yun-Feng Xiao,1,* Xingsheng Luan,2 Qihuang Gong,1 and Chee Wei Wong2,3,† 1State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China 2Optical Nanostructures Laboratory, Columbia University, New York, New York 10027, USA 3Mesoscopic Optics and Quantum Electronics Laboratory, Univer...

phase measurement Fang Liu, Yaoyao Zhou, Juan Yu, Jiale Guo, Yang Wu, Shixiong Xiao, Dan Wei, Yong Zhang, Xiaojun Jia, and Min Xiao National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and School of Physics, Nanjing University, Nanjing 210093, China State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi...

The major roadblock to the development of a useful superconducting quantum coherent bit is decoherence. Integrating a flux-based qubit with Rapid Single Flux Quantum (RSFQ) electronics on a monolithic circuit provides a means to quickly prepare and measure the state of the qubit, thus enabling a number of qubit manipulations and interactions to take place within the qubit coherence time. Howeve...

Ryuji Ukai,1 Jun-ichi Yoshikawa,1 Noriaki Iwata,1 Peter van Loock,2 and Akira Furusawa1 1Department of Applied Physics and Quantum-Phase Electronics Center, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan 2Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Institute of Theoretical Physics I, Universität Erlangen...

Oliver Glöckl,* Stefan Lorenz, Christoph Marquardt, Joel Heersink, Michael Brownnutt, Christine Silberhorn, Qing Pan, Peter van Loock, Natalia Korolkova, and Gerd Leuchs Zentrum für Moderne Optik, Physikalisches Institut, Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics,...

Development of quantum informatics as a new field of computer science poses new challenges to teachers and students of computer science. Among others, very dynamic branches of quantum informatics are quantum programming languages and simulation of quantum systems. This article presents the program of the lecture: “Quantum systems of informatics” that is proposed to students of last semesters of...