Experimental implementation of fully controlled dephasing dynamics and synthetic spectral densities

Research output: Contribution to journalArticle


  • Zhao Di Liu
  • Henri Lyyra
  • Yong Nan Sun
  • Bi Heng Liu
  • Chuan Feng Li
  • Guang Can Guo
  • Sabrina Maniscalco

  • Jyrki Piilo

Research units

  • University of Science and Technology of China
  • University of Turku
  • Synergetic Innovation Center of Quantum Information and Quantum Physics


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.


Original languageEnglish
Article number3453
Pages (from-to)1-7
JournalNature Communications
Issue number1
Publication statusPublished - 1 Dec 2018
MoE publication typeA1 Journal article-refereed

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