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. 2015 Nov 27;6:8984. doi: 10.1038/ncomms9984

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(a) Recorded probability distributions of the quadratures (first row). Distributions of the quadratures according to the reconstructed state (second row, see below for details on reconstruction). Ideal distributions of the quadratures of a two-mode squeezed state with the reconstructed squeezing parameter ξ_fit=0.63 (third row). (b) Two-mode variances and as a function of the local oscillator phase θ. (c) EPR parameter as a function of the local oscillator phase θ. Data points below the dashed line meet the EPR criterion and therefore violate the Heisenberg inequality for inferred uncertainties. At the same time, the EPR criterion also certifies inseparability12. (d) The weaker inseparability parameter as a function of the local oscillator phase θ. The dotted line indicates inseparability of the underlying quantum state. The dashed line is a sufficient condition for the EPR criterion. The error bars indicate the statistical uncertainty (one s.d.).

Inline graphic — (a) Recorded probability distributions of the quadratures (first row). Distributions of the quadratures according to the reconstructed state (second row, see below for details on reconstruction). Ideal distributions of the quadratures of a two-mode squeezed state with the reconstructed squeezing parameter ξ_fit=0.63 (third row). (b) Two-mode variances and as a function of the local oscillator phase θ. (c) EPR parameter as a function of the local oscillator phase θ. Data points below the dashed line meet the EPR criterion and therefore violate the Heisenberg inequality for inferred uncertainties. At the same time, the EPR criterion also certifies inseparability12. (d) The weaker inseparability parameter as a function of the local oscillator phase θ. The dotted line indicates inseparability of the underlying quantum state. The dashed line is a sufficient condition for the EPR criterion. The error bars indicate the statistical uncertainty (one s.d.).