ETH Polymer Physics seminar


2014-02-12
10:15 at HCI J 574

Open Quantum Walks

Francesco Petruccione

National Institute for Theoretical Physics, KwaZulu-Natal (NITheP-KZN), Durban, South Africa

A new model of quantum walks is described, that takes into account the behavior of open quantum systems [S. Attal et. al. J. Stat. Phys. 147, Issue 4, 832 (2012)]. Open Quantum Walks (OQWs) are the exact quantum analogues of classical Markov chains. OQWs have been shown to be useful for the implementation of quantum algorithms for dissipative quantum computing [I. Sinayskiy and F. Petruccione, QIP 11, 1301 (2012)] and to model quantum effects in biological systems [I. Sinayskiy and F. Petruccione, in preparation]. Recently, the connection between the rich dynamical behavior of OQWs and the corresponding microscopic system-environment models has been established. The microscopic derivation of an OQW as a reduced system [I. Sinayskiy, F. Petruccione, Open Syst. & Inf. Dyn. 20, 1340007 (2013)] allows to explain the dependance of the dynamical behavior of the OQW on the temperature and coupling to the environment. For thermal environments we observe Gaussian behaviour, whereas at zero temperature population trapping and soliton-like behaviour are possible. Physical realizations of OQWs in quantum optical setups will be discussed.


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