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Abstract Quantum state transfer is one of the most prominent protocols in quantum information. In the context of optomechanics, it is still an important task, as it allows us to reliably convert an optical pulse into a mechanical excitation. In this paper, the quantum state transfer between a moveable mirror and cavity field is studied when the system is surrounded by non-Markovian environments, which has been recently realized in experiment. Utilizing the experimental spectrum density, we find that the transition from weak non-Markovianity to strong non-Markovianity happens when choosing a suitable optomechanical coupling strength. We also show that quantum state transfer can be implemented with high fidelity in the non-Markovian environment, and the non-Markovian memory effect is helpful for state transfer both in the short-time and long-time scales. [ABSTRACT FROM AUTHOR]

Abstract: In this Letter we investigate an open two-qubit model whose dynamics is not exactly solvable. When the initial state is the maximum entangled state, as the exactly solvable open two-qubit model [D. Tolkunov, V. Privman, P.K. Aravind, Phys. Rev. A 71 (2005) 060308(R)], the decay of entanglement of formation of the model, expressed by concurrence is also governed by the product of suppression factors describing decoherence of the subsystems (qubits). However, if the initial state is not the maximum entangled state, its concurrence will decrease faster than the product of the suppression factors describing decoherence of the qubits. [Copyright &y& Elsevier]

In this paper, we propose a novel non-iterative approach based on the two-dimensional discrete wavelet transform (DWT) for generating binary holograms in in-line holography. This method is able to alleviate the degradation appearance on the reconstructed image caused by the direct sign-thresholding. Numerical experiments of this method are given in this paper. It is shown that high-quality images of the binary hologram can be reconstructed by using the proposed method. Additionally, the reconstructed images also contain less amount of noise contamination. [ABSTRACT FROM AUTHOR]