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Open quantum system identication

S. G. Schirmer, Daniel K. L. Oi, Weiwei Zhou, Erling Gong, Ming Zhang

Published May 28, 2012• 0 citations
OpenAlex

Abstract

College of Mechatronic Engineering and Automation, National University ofDefense Technology, Changsha 410073, ChinaAbstract. Engineering quantum systems o ers great opportunities both tech-nologically and scienti cally for communication, computation, and simulation.The construction and operation of large scale quantum information devicespresents a grand challenge and a major issue is the e ective control of coherentdynamics. This is often in the presence of decoherence which further complicatesthe task of determining the behaviour of the system. Here, we show how to de-termine open system Markovian dynamics of a quantum system with restrictedinitialisation and partial output state information.PACS numbers: 03.67.Lx

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College of Mechatronic Engineering and Automation, National University ofDefense Technology, Changsha 410073, ChinaAbstract. Engineering quantum systems o ers great opportunities both tech-nologically and scienti cally for communication, computation, and simulation.The construction and operation of large scale quantum information devicespresents a grand challenge and a major issue is the e ective control of coherentdynamics. This is often in the presence of decoherence which further complicatesthe task of determining the behaviour of the system. Here, we show how to de-termine open system Markovian dynamics of a quantum system with restrictedinitialisation and partial output state information.PACS numbers: 03.67.Lx
Engineering quantum systems offers great opportunities both technologically and scientifically for communication, computation, and simulation. The construction and operation of large scale quantum information devices presents a grand challenge and a major issue is the effective control of coherent dynamics. This is often in the presence of decoherence which further complicates the task of determining the behaviour of the system. Here, we show how to determine open system Markovian dynamics of a quantum system with restricted initialisation and partial output state information.
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.