https://doi.org/10.1140/epjd/e2013-40036-3
Regular Article
Protecting qutrit-qutrit entanglement by weak measurement and reversal
1 College of Physics and Electronic
Information, Gannan Normal University, Ganzhou
341000, P.R.
China
2 Institute of Optoelectronic Materials
and Technology, Gannan Normal University, Ganzhou
341000, P.R.
China
3 School of Information Engineering,
Jiangxi University of Science and Technology, Ganzhou
341000, P.R.
China
a e-mail: xiaoxing1121@gmail.com
Received:
22
January
2013
Received in final form:
30
May
2013
Published online:
1
October
2013
Entangled states in high dimensional systems are of great interest due to the extended possibilities they provide in quantum information processing. Recently, Sun et al. [Phys. Rev. A 82, 052323 (2010)] and Kim et al. [Nat. Phys. 8, 117 (2012)] pointed out that weak measurement and quantum weak measurement reversal can actively combat decoherence. We generalize their studies from qubits to qutrits under amplitude damping decoherence. We find that the qutrit-qutrit entanglement can be partially retrieved for certain initial states when only weak measurement reversals are performed. However, we can completely defeat amplitude damping decoherence for any initial states by the combination of prior weak measurements and post optimal weak measurement reversals. The experimental feasibility of our schemes is also discussed.
Key words: Quantum Information
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013