Observation of quantum Hawking radiation and its entanglement in an analogue black hole
Abstract
We observe spontaneous Hawking radiation, stimulated by quantum vacuum fluctuations, emanating from an analogue black hole in an atomic BoseEinstein condensate. Correlations are observed between the Hawking particles outside the black hole and the partner particles inside. These correlations indicate an approximately thermal distribution of Hawking radiation. We find that the highenergy pairs are entangled, while the lowenergy pairs are not, within the reasonable assumption that excitations with different frequencies are not correlated. The entanglement verifies the quantum nature of the Hawking radiation. The results are consistent with a driven oscillation experiment and a numerical simulation.
 Publication:

Nature Physics
 Pub Date:
 October 2016
 DOI:
 10.1038/nphys3863
 arXiv:
 arXiv:1510.00621
 Bibcode:
 2016NatPh..12..959S
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 The latest version has additional data and explanations