Enhanced non-Markovian behavior in quantum walks with Markovian disorder.

Autor:	Kumar NP; The Institute of Mathematical Sciences, C. I. T campus, Taramani, Chennai, 600113, India., Banerjee S; Indian Institute of Technology, Jodhpur, 342037, India., Chandrashekar CM; The Institute of Mathematical Sciences, C. I. T campus, Taramani, Chennai, 600113, India. chandru@imsc.res.in.; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India. chandru@imsc.res.in.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2018 Jun 11; Vol. 8 (1), pp. 8801. Date of Electronic Publication: 2018 Jun 11.
DOI:	10.1038/s41598-018-27132-7
Abstrakt:	Non-Markovian quantum effects are typically observed in systems interacting with structured reservoirs. Discrete-time quantum walks are prime example of such systems in which, quantum memory arises due to the controlled interaction between the coin and position degrees of freedom. Here we show that the information backflow that quantifies memory effects can be enhanced when the particle is subjected to uncorrelated static or dynamic disorder. The presence of disorder in the system leads to localization effects in 1-dimensional quantum walks. We shown that it is possible to infer about the nature of localization in position space by monitoring the information backflow in the reduced system. Further, we study other useful properties of quantum walk such as entanglement, interference and its connection to quantum non-Markovianity.
Databáze:	MEDLINE
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