Experimental emulation of quantum non-Markovian dynamics and coherence protection in the presence of information backflow

Deepak Khurana, Bijay Kumar Agarwalla, and T. S. Mahesh
Phys. Rev. A 99, 022107 – Published 7 February 2019

Abstract

We experimentally emulate, in a controlled fashion, the non-Markovian dynamics of a pure dephasing spin-boson model at zero temperature. Specifically, we use a randomized set of external radio-frequency fields to engineer a desired noise power spectrum to effectively realize a non-Markovian environment for a single NMR qubit. The information backflow, characteristic to the non-Markovianity, is captured in the nonmonotonicity of the decoherence function and von Neumann entropy of the system. Using such emulated non-Markovian environments, we experimentally study the efficiency of the Carr-Purcell-Meiboom-Gill dynamical decoupling (DD) sequence to inhibit the loss of coherence. Using the filter function formalism, we design optimized DD sequences that maximize coherence protection for non-Markovian environments and study their efficiencies experimentally. Finally, we discuss DD-assisted tuning of the effective non-Markovianity.

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  • Received 2 June 2018

DOI:https://doi.org/10.1103/PhysRevA.99.022107

©2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Deepak Khurana*, Bijay Kumar Agarwalla, and T. S. Mahesh

  • Department of Physics, Indian Institute of Science Education and Research, Pune 411008, India

  • *deepak.khurana@students.iiserpune.ac.in
  • bijay@iiserpune.ac.in
  • mahesh.ts@iiserpune.ac.in

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Issue

Vol. 99, Iss. 2 — February 2019

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