Full characterization of Gaussian bipartite entangled states by a single homodyne detector.

@article{DAuria2009FullCO,
  title={Full characterization of Gaussian bipartite entangled states by a single homodyne detector.},
  author={Virginia D'Auria and Stefano Fornaro and Alberto Porzio and S. Solimeno and Stefano Olivares and Matteo G. A. Paris},
  journal={Physical review letters},
  year={2009},
  volume={102 2},
  pages={
          020502
        }
}
We present the full experimental reconstruction of Gaussian entangled states generated by a type-II optical parametric oscillator below threshold. Our scheme provides the entire covariance matrix using a single homodyne detector and allows for the complete characterization of bipartite Gaussian states, including the evaluation of purity, entanglement, and nonclassical photon correlations, without a priori assumptions on the state under investigation. Our results show that single homodyne… 

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References

SHOWING 1-10 OF 45 REFERENCES

HOMODYNE CHARACTERIZATION OF CONTINUOUS VARIABLE BIPARTITE STATES

We suggest a scheme to reconstruct the covariance matrix of continuous variable two-mode states using a single homodyne detector and a few polarization elements. Our method can be used to fully

Experimental characterization of Gaussian quantum-communication channels

From the experimental data, the lower bound to the quantum channel capacity, the teleportation fidelity of coherent states, and the logarithmic negativity and purity of the shared state were determined.

Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation

A powerful theoretical structure has emerged in recent years on the characterization and quantification of entanglement in continuous-variable systems. After reviewing this framework, we will

Time-resolved homodyne characterization of individual quadrature-entangled pulses

Abstract.We describe a simple and efficient set-up to generate and characterize femtosecond quadrature-entangled pulses. Quantum correlations equivalent to about 2.5 dB squeezing are efficiently and

Characterization of bipartite states using a single homodyne detector

We suggest a scheme to reconstruct the covariance matrix of a two-mode state using a single homodyne detector plus a polarizing beam splitter and a polarization rotator. It can be used to fully

An experimental investigation of criteria for continuous variable entanglement

Theentanglement is presented on a diagram of the average sideband photon number required to generate the entanglement versus the average number of excess sideband photons, as deduced from the measured values of the quadrature variances.

Quantum Communication with Continuous Variables

The bottom line of this work is that a particular kind of entanglement, namely that based on continuous quantum variables, can be created relatively easily, and only squeezers and beam splitters are required to entangle arbitrarily many electromagnetic modes.

Squeezed states with thermal noise. I. Photon-number statistics.

  • Marian
  • Physics
    Physical review. A, Atomic, molecular, and optical physics
  • 1993
A free monochromatic electromagnetic field is investigated which is the superposition of a squeezed thermal radiation and a coherent one and an analytic formula is established for an arbitrary correlation function, as well as its strong-squeezing limit.

Entanglement in the above-threshold optical parametric oscillator

We investigate entanglement in the above-threshold optical parametric oscillator, both theoretically and experimentally, and discuss its potential applications to quantum information. The

Bures distance as a measure of entanglement for two-mode squeezed thermal states (10 pages)

We propose a reliable entanglement measure for a two-mode squeezed thermal state of the quantum electromagnetic field in terms of its Bures distance to the set of all separable states of the same