Ancilla-assisted measurement of photonic spatial correlations and entanglement
arXiv:1402.2781 · doi:10.1103/PhysRevLett.112.053602
Abstract
We report an experiment in which the moments of spatial coordinates of down-converted photons are measured directly, without having to reconstruct any marginal probability distributions. We use a spatial light modulator to couple the spatial degrees of freedom and the polarization of the fields, which act as ancilla systems. Information about the spatial correlations is obtained via measurements on the ancilla qubits. Among other applications, this new method provides a more efficient technique to identify continuous variable entanglement.
arXiv comment6 pages (4+Supplementary Information), 3 figures
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- Testing the Clauser-Horne-Shimony-Holt inequality using observables with arbitrary spectrum
- Experimental ancilla-assisted phase-estimation in a noisy channel
- Uncertainty relations for characteristic functions
- Unified framework to determine Gaussian states in continuous variable systems
- Negative Wigner function by decaying interaction from equilibrium