Experimental emulation of quantum non-Markovian dynamics and coherence protection in the presence of information backflow
| Autor: | Khurana, Deepak, Agarwalla, Bijay Kumar, Mahesh, T. S. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 99, 022107 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.99.022107 |
| Popis: | 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. Comment: 8 Pages, 6 Figures, close to published version |
| Databáze: | arXiv |
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