Storing entanglement of nuclear spins via Uhrig dynamical decoupling

Soumya Singha Roy*, T. S. Mahesh, G. S. Agarwal

*Corresponding author for this work

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Stroboscopic spin flips have already been shown to prolong the coherence times of quantum systems under noisy environments. Uhrig's dynamical decoupling scheme provides an optimal sequence for a quantum system interacting with a dephasing bath. Several experimental demonstrations have already verified the efficiency of such dynamical decoupling schemes in preserving single-qubit coherences. In this work we describe the experimental study of Uhrig's dynamical decoupling in preserving two-qubit entangled states using an ensemble of spin-1/2 nuclear pairs in solution state. We find that the performance of odd-order Uhrig sequences in preserving entanglement is superior to both even-order Uhrig sequences and periodic spin-flip sequences. We also find that there exists an optimal order of the Uhrig sequence in which a singlet state can be stored at high correlation for about 30 seconds.

Original languageEnglish
Article number062326
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Issue number6
Publication statusPublished - 21 Jun 2011

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