Volume 118, Number 5, June 2017
|Number of page(s)
|31 July 2017
Experimentally freezing quantum discord in a dephasing environment using dynamical decoupling
Department of Physical Sciences, Indian Institute of Science Education & Research (IISER) Mohali Sector 81 SAS Nagar, Manauli, PO 140306, Punjab, India
Received: 25 May 2017
Accepted: 10 July 2017
The discovery of the intriguing phenomenon that certain kinds of quantum correlations remain impervious to noise up to a specific point in time and then suddenly decay, has generated immense recent interest. We exploit dynamical decoupling sequences to prolong the persistence of time-invariant quantum correlations in a system of two NMR qubits decohering in independent dephasing environments. We experimentally prepare two-qubit Bell-diagonal quantum states that interact with individual noise channels and demonstrate that we are able to freeze quantum correlations over long time scales via dynamical decoupling. Our results have important implications for experimental quantum control and for quantum information processing protocols.
PACS: 03.67.-a – Quantum information / 03.67.Pp – Quantum error correction and other methods for protection against decoherence / 03.67.Lx – Quantum computation architectures and implementations
© EPLA, 2017
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