1108.3397 (A. Thilagam)

Violation of the "information-disturbance relationship" in a
multipartite system    [PDF]

A. Thilagam

The effect of non-ideal or imperfect measuring attributes such as the quantum level of precision and finite duration on the classical correlation and quantum discord is analysed for a pair of qubits immersed in a common reservoir. We show that the quantum discord is enhanced as the precision of the measuring instrument is increased, and both the classical correlation and the quantum discord undergo noticeable changes during the period when measurements are performed on a neighboring partition. The implication of these results on the "information-disturbance relationship" is examined, with critical analysis of the delicate roles played by quantum non-locality and non-Markovian dynamics in the violation of this relationship, which appears surprisingly for a range of measurement attributes.

View original: http://arxiv.org/abs/1108.3397