Quantification of Quantum Correlations in Two-Beam Gaussian States Using Photon-Number Measurements
arXiv:2209.05422 · doi:10.1103/PhysRevLett.130.043603
Abstract
Identification, and subsequent quantification of quantum correlations, is critical for understanding, controlling, and engineering quantum devices and processes. We derive and implement a general method to quantify various forms of quantum correlations using solely the experimental intensity moments up to the fourth order. This is possible as these moments allow for an exact determination of the global and marginal impurities of two-beam Gaussian fields. This leads to the determination of steering, tight lower and upper bounds for the negativity, and the Kullback-Leibler divergence used as a quantifier of state nonseparability. The principal squeezing variances are determined as well using the intensity moments. The approach is demonstrated on the experimental twin beams with increasing intensity and the squeezed super-Gaussian beams composed of photon pairs. Our method is readily applicable to multibeam Gaussian fields to characterize their quantum correlations.
6 pages, 2 figures, extended version, some parts of version one moved to the Supplemental Material
References in corpus (12)
- Experimental criteria for steering and the Einstein-Podolsky-Rosen paradox
- Quantification of Gaussian quantum steering
- Determination of continuous variable entanglement by purity measurements
- Quantification and scaling of multipartite entanglement in continuous variable systems
- Schur complement inequalities for covariance matrices and monogamy of quantum correlations
- Entanglement, purity and energy: Two qubits vs Two modes
- Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams
- Spatial properties of twin-beam correlations at low- to high-intensity transition
- Direct method for measuring and witnessing quantum entanglement of arbitrary two-qubit states through Hong-Ou-Mandel interference
- Experimental quantification of the entanglement of noisy twin beams
- Non-classicality criteria for N-dimensional optical fields detected by quadratic detectors
- Displaced photon-number entanglement tests