Experimental repetitive quantum channel simulation  

作　　者：Ling Hu Xianghao Mu Weizhou Cai Yuwei Ma Yuan Xu Haiyan Wang Yipu Song Chang-Ling Zou Luyan Sun 

机构地区：[1]Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University [2]Key Laboratory of Quantum Information, CAS, University of Science and Technology of China

出　　处：《Science Bulletin》2018年第23期1551-1557,共7页科学通报（英文版）

基　　金：the support from National Key Research and Development Program of China (2017YFA0304303);the National Natural Science Foundation of China (11474177);C.L. Zou is supported by Anhui Initiative in Quantum Information Technologies (AHY130000)

摘　　要：Universal control of quantum systems is a major goal to be achieved for quantum information processing,which demands thorough understanding of fundamental quantum mechanics and promises applications of quantum technologies. So far, most studies concentrate on ideally isolated quantum systems governed by unitary evolutions, while practical quantum systems are open and described by quantum channels due to their inevitable coupling to environment. Here, we experimentally simulate arbitrary quantum channels for an open quantum system, i.e. a single photonic qubit in a superconducting quantum circuit.The arbitrary channel simulation is achieved with minimum resource of only one ancilla qubit and measurement-based adaptive control. By repetitively implementing the quantum channel simulation,we realize an arbitrary Liouvillian for a continuous evolution of an open quantum system for the first time. Our experiment provides not only a testbed for understanding quantum noise and decoherence,but also a powerful tool for full control of practical open quantum systems.Universal control of quantum systems is a major goal to be achieved for quantum information processing,which demands thorough understanding of fundamental quantum mechanics and promises applications of quantum technologies. So far, most studies concentrate on ideally isolated quantum systems governed by unitary evolutions, while practical quantum systems are open and described by quantum channels due to their inevitable coupling to environment. Here, we experimentally simulate arbitrary quantum channels for an open quantum system, i.e. a single photonic qubit in a superconducting quantum circuit.The arbitrary channel simulation is achieved with minimum resource of only one ancilla qubit and measurement-based adaptive control. By repetitively implementing the quantum channel simulation,we realize an arbitrary Liouvillian for a continuous evolution of an open quantum system for the first time. Our experiment provides not only a testbed for understanding quantum noise and decoherence,but also a powerful tool for full control of practical open quantum systems.

关 键 词：QUANTUM channel SIMULATION OPEN QUANTUM system Adaptive QUANTUM control SUPERCONDUCTING QUANTUM COMPUTATION 

分 类 号：N[自然科学总论]