Time Invariant Discord and Non-Markovianity

Details Time Invariant Discord and Non-Markovianity Time Invariant Discord and Non-Markovianity

2012-03-29

arxiv.org/abs/1203.6469v1

Physics

Quantum Physics

Scientific paper

We study the dynamics of quantum discord shared by two qubits in local dephasing reservoirs. It is known that discord may be unaffected by noise for a finite time, followed by a sudden transition from classical to quantum decoherence. In this Letter, using an exact noise model, we unveil a class of initial states with completely time invariant discord, that is, discord frozen to a positive value for arbitrarily long times. We connect this phenomenon to non-Markovian properties of the dephasing noise and propose a physical set-up where time invariant discord could be observed. Finally, we prove that Markovian pure dephasing models are inconsistent with all super-Ohmic environments.

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