Eur. Phys. J. D (2013) 67: 204
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

Abstract

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.