Experimental implementation of fully controlled dephasing dynamics and synthetic spectral densities

Zhao-Di Liu, Henri Lyyra, Yong-Nan Sun, Bi-Heng Liu, Chuan-Feng Li (), Guang-Can Guo, Sabrina Maniscalco and Jyrki Piilo ()
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Zhao-Di Liu: University of Science and Technology of China
Henri Lyyra: University of Turku
Yong-Nan Sun: University of Science and Technology of China
Bi-Heng Liu: University of Science and Technology of China
Chuan-Feng Li: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China
Sabrina Maniscalco: University of Turku
Jyrki Piilo: University of Turku

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-05817-x

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