CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China.
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, People's Republic of China.
Nat Commun. 2018 Aug 27;9(1):3453. doi: 10.1038/s41467-018-05817-x.
Engineering, controlling, and simulating quantum dynamics is a strenuous task. However, these techniques are crucial to develop quantum technologies, preserve quantum properties, and engineer decoherence. Earlier results have demonstrated reservoir engineering, construction of a quantum simulator for Markovian open systems, and controlled transition from Markovian to non-Markovian regime. Dephasing is an ubiquitous mechanism to degrade the performance of quantum computers. However, all-purpose quantum simulator for generic dephasing is still missing. Here, we demonstrate full experimental control of dephasing allowing us to implement arbitrary decoherence dynamics of a qubit. As examples, we use a photon to simulate the dynamics of a qubit coupled to an Ising chain in a transverse field and also demonstrate a simulation of nonpositive dynamical map. Our platform opens the possibility to simulate dephasing of any physical system and study fundamental questions on open quantum systems.
工程、控制和模拟量子动力学是一项艰巨的任务。然而，这些技术对于开发量子技术、保持量子特性和工程退相干至关重要。早期的研究成果已经展示了储层工程、用于马尔可夫开放系统的量子模拟器的构建，以及从马尔可夫到非马尔可夫状态的控制转换。退相是一种普遍存在的机制，会降低量子计算机的性能。然而，通用退相的全功能量子模拟器仍然缺失。在这里，我们展示了退相的完全实验控制，使我们能够实现量子位的任意退相干动力学。作为示例，我们使用光子来模拟与横向场中的伊辛链耦合的量子位的动力学，并且还展示了非正定动力映射的模拟。我们的平台为模拟任何物理系统的退相干并研究开放量子系统的基本问题提供了可能性。
