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Published November 3, 2012 | Submitted
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Reveal non-Markovianity of open quantum systems via local operations


Non-Markovianity, as an important feature of general open quantum systems, is usually difficult to quantify with limited knowledge of how the plant that we are interested in interacts with its environment-the bath. It often happens that the reduced dynamics of the plant attached to a non-Markovian bath becomes indistinguishable from the one with a Markovian bath, if we left the entire system freely evolve. Here we show that non-Markovianity can be revealed via applying local unitary operations on the plant-they will influence the plant evolution at later times due to memory of the bath. This not only provides a new criterion for non-Markovianity, but also sheds light on protecting and recovering quantum coherence in non-Markovian systems, which will be useful for quantum-information processing.

Additional Information

We thank S.L. Danilishin, F.Ya, Kahlili and other colleagues in the LIGO MQM group for fruitful discussions. This work has been supported by NSF grants PHY-0555406, PHY-0653653, PHY-0601459, PHY-0956189, PHY-1068881, as well as the David and Barbara Groce startup fund at Caltech.

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