We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is onl...We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.展开更多
Discriminating two spatially separated sources is one of the most fundamental problems in imaging.Recent research based on quantum parameter estimation theory shows that the resolution limit of two incoherent point so...Discriminating two spatially separated sources is one of the most fundamental problems in imaging.Recent research based on quantum parameter estimation theory shows that the resolution limit of two incoherent point sources given by Rayleigh can be broken.However,in realistic optical systems,there often exists coherence in the imaging light field,and there have been efforts to analyze the optical resolution in the presence of partial coherence.Nevertheless,how the degree of coherence between two point sources affects the resolution has not been fully understood.Here,we analyze the quantum-limited resolution of two partially coherent point sources by explicitly relating the state after evolution through the optical systems to the coherence of the sources.In particular,we consider the situation in which coherence varies with the separation.We propose a feasible experiment scheme to realize the nearly optimal measurement,which adaptively chooses the binary spatial-mode demultiplexing measurement and direct imaging.Our results will have wide applications in imaging involving coherence of light.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11264018)the Natural Science Foundation of Jiangxi Province,China(Grant No.20132BAB212006)
文摘We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.
基金supported by the National Key Research and Development Program of China(Nos.2018YFA0306202 and 2017YFA0303703)the National Natural Science Foundation of China(Nos.91836303,61975077,61490711,and 11690032)the Fundamental Research Funds for the Central Universities(No.020214380068)。
文摘Discriminating two spatially separated sources is one of the most fundamental problems in imaging.Recent research based on quantum parameter estimation theory shows that the resolution limit of two incoherent point sources given by Rayleigh can be broken.However,in realistic optical systems,there often exists coherence in the imaging light field,and there have been efforts to analyze the optical resolution in the presence of partial coherence.Nevertheless,how the degree of coherence between two point sources affects the resolution has not been fully understood.Here,we analyze the quantum-limited resolution of two partially coherent point sources by explicitly relating the state after evolution through the optical systems to the coherence of the sources.In particular,we consider the situation in which coherence varies with the separation.We propose a feasible experiment scheme to realize the nearly optimal measurement,which adaptively chooses the binary spatial-mode demultiplexing measurement and direct imaging.Our results will have wide applications in imaging involving coherence of light.
