Abstract：Noiseless linear amplification (NLA), first proposed by Ralpha et al., is a nondeterministic amplification process which gives gain to the Fock state $|n\rangle\rightarrow g^n|n\rangle$, with $g$ being the amplification gain. We here give a general framework for improving the NLA scheme with arbitrary general local unitary operations. We derive the improvement in the amplification gain in 0–1 photon subspace. In particular, we study if the local unitary is composed of single mode squeezing and coherent displacement operation. Finally, numerical simulations show that local unitary operation could give a further enhancement in the amplification gain as well as the success probability, making the NLA more feasible in future optic quantum communications.
(Optical implementations of quantum information processing and transfer)
引用本文:
. [J]. 中国物理快报, 2016, 33(07): 70304-070304.
Song Yang, Ning-Juan Ruan, Yun Su, Xu-Ling Lin, Zhi-Qiang Wu. Noiseless Linear Amplification with General Local Unitary Operations. Chin. Phys. Lett., 2016, 33(07): 70304-070304.
Ralph T C and Lund A P 2008 Quantum Communication Measurement and Computing Proceedings of 9th International Conference (Calgary, Canada 19–24 August 2008) p 155
2016, Vol. 33 
