The CW second-harmonic wave of high-gain polarization atλ=l.085μm was demonstrated with Nd:MgO:LiNbO_(3) self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental wavelength.The pump...The CW second-harmonic wave of high-gain polarization atλ=l.085μm was demonstrated with Nd:MgO:LiNbO_(3) self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental wavelength.The pump power threshold for the second-harmonic generation as low as 9.9mW was achieved.The maximum second-harmonic output was 11.4 m W,the conversion efficiency for the total second-harmonic output was 11.3%per Watt.展开更多
We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadriparti...We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadripartite entangled states can be obtained by the linearly optical transformation of four amplitude-quadrature and phase-quadrature squeezed states produced from a pair of nondegenerate optical parametric amplifiers under appropriate phase relations.The criteria for full inseparability of quadripartite cluster-like state were deduced,and the dependency of the quadripartite entanglement on the initial squeezing degree,the transmission efficiencies of the system and the detection efficiency of homodyne detection were numerically calculated.展开更多
Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this p...Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this paper, we briefly summarize the recent experimental studies conducted by our group on enhanced cross-phase modulation based on double EIT effects, the quantum interference of stored dual-channel spin-wave excitations and the coherent manipulation of the spin wave vector for the polarization of photons in a single tripod atomic system. The work presented here has potential application in the developing field of quantum information processing.展开更多
The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation.In this paper,we review the experimental progress in the preparation of cluster s...The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation.In this paper,we review the experimental progress in the preparation of cluster states and multi-color entangled states with continuous variables.The preparation of lager scale multipartite entangled state provide valuable quantum resources to implement more complex quantum informational tasks.展开更多
文摘The CW second-harmonic wave of high-gain polarization atλ=l.085μm was demonstrated with Nd:MgO:LiNbO_(3) self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental wavelength.The pump power threshold for the second-harmonic generation as low as 9.9mW was achieved.The maximum second-harmonic output was 11.4 m W,the conversion efficiency for the total second-harmonic output was 11.3%per Watt.
基金Supported by the National Natural Science Foundation of China(Grant Nos.10674088 and 60608012)Program for Changjiang Scholars andInnovative Research Team in University(Grant No.IRT0516)
文摘We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadripartite entangled states can be obtained by the linearly optical transformation of four amplitude-quadrature and phase-quadrature squeezed states produced from a pair of nondegenerate optical parametric amplifiers under appropriate phase relations.The criteria for full inseparability of quadripartite cluster-like state were deduced,and the dependency of the quadripartite entanglement on the initial squeezing degree,the transmission efficiencies of the system and the detection efficiency of homodyne detection were numerically calculated.
基金supported by the National Basic Research Program of China (2010CB923103)the National Natural Science Foundation of China (10874106, 60821004 and 10904086)
文摘Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this paper, we briefly summarize the recent experimental studies conducted by our group on enhanced cross-phase modulation based on double EIT effects, the quantum interference of stored dual-channel spin-wave excitations and the coherent manipulation of the spin wave vector for the polarization of photons in a single tripod atomic system. The work presented here has potential application in the developing field of quantum information processing.
基金supported by the National Basic Research Program of China(Grant No.2010CB923103)the National Natural Science Foundation of China(Grant Nos.11322440,11074157,11174188 and 61121064)OIT and Shanxi Scholarship Council of China(Grant No.2012-010)
文摘The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation.In this paper,we review the experimental progress in the preparation of cluster states and multi-color entangled states with continuous variables.The preparation of lager scale multipartite entangled state provide valuable quantum resources to implement more complex quantum informational tasks.
