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SUMMARY:Quantum chaotic behaviour of dynamical discord
DTSTART;VALUE=DATE-TIME:20140619T190000Z
DTEND;VALUE=DATE-TIME:20140619T191500Z
DTSTAMP;VALUE=DATE-TIME:20201204T020642Z
UID:indico-contribution-1652474@indico.cern.ch
DESCRIPTION:Speakers: Shohini Ghose (Wilfrid Laurier University)\nChaos in
classical systems is characterized by extreme sensitivity of the dynamics
to small perturbations. A corresponding characterization at the quantum l
evel is challenging due to the uncertainty principle and the unitarity of
quantum evolution. Here we explore how chaos can manifest itself in the qu
antum correlations between a collection of spin-1/2 systems or qubits. We
present the first evidence of signatures of chaos in the dynamics of quan
tum discord in the multiqubit system\, which is collectively modelled as a
kicked top. The evolution of discord between any two qubits is quasiperio
dic in regular regions\, while in chaotic regions\, the quasiperiodicity i
s lost. As the initial wave function is varied from the regular regions to
the chaotic sea\, a contour plot of the time averaged-discord clearly rep
roduces the structures of the classical stroboscopic map. We also find sur
prisingly opposite behaviour of two-qubit discord versus two-qubit entangl
ement. Our calculations show that unlike two-qubit entanglement\, two-qubi
t discord is robust in the presence of a chaotic environment. Our results
provide new insight into the effect of chaos on quantum correlations and a
re of relevance for the design of protocols involving multiqubit systems i
n noisy environments.\n\nhttps://indico.cern.ch/event/293589/contributions
/1652474/
LOCATION:Laurentian University / Université Laurentienne C-309
URL:https://indico.cern.ch/event/293589/contributions/1652474/
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