Experimental generation of 8.4 dB entangled state with an optical cavity involving a wedged type-II nonlinear crystal

Abstract

Entangled state of light is one of the essential quantum resources in quantum information science and technology. Especially, when the fundamental principle experiments have been achieved in labs and the applications of continuous variable quantum information in the real world are considered, it is crucial to design and construct the generation devices of entangled states with high entanglement and compact configuration. We have designed and built an efficient and compact light source of entangled state, which is a non-degenerate optical parametric amplifier (NOPA) with the triple resonance of the pump and two subharmonic modes. A wedged type-II KTP crystal inside the NOPA is used for implementing frequency-down-conversion of the pump field to generate the optical entangled state and achieving the dispersion compensation between the pump and the subharmonic waves. The EPR entangled state of light with quantum correlations of 8.4 dB for both amplitude and phase quadratures are experimentally produced by a single NOPA under the pump power of 75 mW.

References in corpus (5)

• Experimental quantum teleportation
• Experimental generation of four-mode continuous-variable cluster states
• High-fidelity continuous-variable quantum teleportation toward multi-step quantum operations
• Experimental demonstration of entanglement assisted coding using a two-mode squeezed vacuum state
• Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables

Cited by in corpus (8)

• Quantum entanglement swapping between two multipartite entangled states
• Manipulating the direction of Einstein-Podolsky-Rosen steering
• Generating quantum correlated twin beams by four-wave mixing in hot cesium vapor
• Experimental generation of tripartite polarization entangled states of bright optical beams
• Quantum beam splitter for orbital angular momentum of light: quantum correlation by four-wave mixing operated in a nonamplifying regime
• Dependence of the photon statistics of down-converted field-modes on the photon statistics of pump field-mode
• Synthesis of the Einstein-Podolsky-Rosen entanglement in a sequence of two single-mode squeezers
• Quantum enhanced optical phase estimation with a squeezed thermal state