Experimental generation of 6 dB continuous variable entanglement from a nondegenerate optical parametric amplifier

Abstract

We experimentally demonstrated that the quantum correlations of amplitude and phase quadratures between signal and idler beams produced from a non-degenerate optical parametric amplifier (NOPA) can be significantly improved by using a mode cleaner in the pump field and reducing the phase fluctuations in phase locking systems. Based on the two technical improvements the quantum entanglement measured with a two-mode homodyne detector is enhanced from ~ 4 dB to ~ 6 dB below the quantum noise limit using the same NOPA and nonlinear crystal.

7 pages, 5 figures

References in corpus (8)

• Universal Quantum Computation with Continuous-Variable Cluster States
• Observation of squeezed light with 10dB quantum noise reduction
• Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement
• Experimental generation of four-mode continuous-variable cluster states
• Demonstration of a quantum nondemolition sum gate
• Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator
• Continuous variable quantum key distribution based on optical entangled states without signal modulation
• Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables

Cited by in corpus (16)

• Gate sequence for continuous variable one-way quantum computation
• Experimental preparation of eight-partite linear and two-diamond shape cluster states for photonic qumodes
• Strong Einstein-Podolsky-Rosen steering with unconditional entangled states
• Einstein-Podolsky-Rosen entanglement and steering in two-well BEC ground states
• Experimental generation of 8.4 dB entangled state with an optical cavity involving a wedged type-II nonlinear crystal
• Cascaded Entanglement Enhancement
• Coherent feedback control of multipartite quantum entanglement for optical fields
• Dynamical preparation of EPR entanglement in two-well Bose-Einstein condensates
• Gaussian Entanglement for Quantum Key Distribution from a Single-Mode Squeezing Source
• Two-mode squeezed states as Schrodinger-cat-like states
• Towards an Einstein-Podolsky-Rosen paradox between two macroscopic atomic ensembles at room temperature
• Gates for one-way quantum computation based on Einstein-Podolsky-Rosen entanglement
• Quantifying the mesoscopic nature of the Einstein-Podolsky-Rosen nonlocality
• Effect of incoherent pump on two-mode entanglement in optical parametric generation
• Mesoscopic and macroscopic quantum correlations in photonic, atomic and optomechanical systems
• Dependence of the photon statistics of down-converted field-modes on the photon statistics of pump field-mode