Berry phase of higher-dimensional orbital angular momentum of light is studied.When an Nth order orbital state,described by a vector in(N+1)-dimensional space,evolves through a closed path in space of orbital states,t...Berry phase of higher-dimensional orbital angular momentum of light is studied.When an Nth order orbital state,described by a vector in(N+1)-dimensional space,evolves through a closed path in space of orbital states,there will exist a higher order orbital Berry phase.We calculate this phase by using the matrix transformation theory.A direct measurement of the higher-order orbital Berry phase is also carried out by the interference method.The experimental results are in good agreement with the theoretical description,which shows that the Berry phase is proportional to the orbital angular momentum of light.展开更多
A non-equilibrium model of a classically driven quantum harmonic oscillator is proposed to explain persistent quantum entanglement in biological systems at ambient temperature.The conditions for periodic entanglement ...A non-equilibrium model of a classically driven quantum harmonic oscillator is proposed to explain persistent quantum entanglement in biological systems at ambient temperature.The conditions for periodic entanglement generation are derived.Our results support the evidence that biological systems may have quantum entanglement at biological temperatures.展开更多
Quantum nonlocally correlated observables of the squeezed Bell-like states are investigated.We find that the higher amount of the entanglement does not always mean the stronger correlation of positions and momentums i...Quantum nonlocally correlated observables of the squeezed Bell-like states are investigated.We find that the higher amount of the entanglement does not always mean the stronger correlation of positions and momentums in the non-Gaussian states such as the photon-added states and the squeezed number states.Quantum nonlocal correlations of the amplitude-squared operators signal the entanglement existence of all the squeezed Bell-like states.展开更多
基金Supported by the Education Program for Talented Students of Xi’an Jiaotong University,the National Natural Science Foun-dation of China under Grant Nos 11074198,11004158,11174233 and 11074199the Doctoral Fund of the Ministry of Education of China under Grant No 20120201110035.
文摘Berry phase of higher-dimensional orbital angular momentum of light is studied.When an Nth order orbital state,described by a vector in(N+1)-dimensional space,evolves through a closed path in space of orbital states,there will exist a higher order orbital Berry phase.We calculate this phase by using the matrix transformation theory.A direct measurement of the higher-order orbital Berry phase is also carried out by the interference method.The experimental results are in good agreement with the theoretical description,which shows that the Berry phase is proportional to the orbital angular momentum of light.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11174233,11004158 and 11074198the National Basic Research Program of China under Grant No 2011CB311807the Fundamental Research Funds for the Central University。
文摘A non-equilibrium model of a classically driven quantum harmonic oscillator is proposed to explain persistent quantum entanglement in biological systems at ambient temperature.The conditions for periodic entanglement generation are derived.Our results support the evidence that biological systems may have quantum entanglement at biological temperatures.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10774117 and 60778021.
文摘Quantum nonlocally correlated observables of the squeezed Bell-like states are investigated.We find that the higher amount of the entanglement does not always mean the stronger correlation of positions and momentums in the non-Gaussian states such as the photon-added states and the squeezed number states.Quantum nonlocal correlations of the amplitude-squared operators signal the entanglement existence of all the squeezed Bell-like states.
