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Overcoming Vacuum Noise: The Unforeseen Benefits of Quantum Heterodyne Detection

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Abstract

Homodyne tomography and heterodyne detection are principal measurement schemes in continuous-variable quantum information and provide different accuracies in determining the quantum state of a system. The former allows for a tomographic reconstruction of the Wigner function of the state, whereas the latter directly samples its Husimi Q-function. We experimentally demonstrate that contrary to a common belief, heterodyne detection outperforms homodyne tomography for almost all Gaussian states.

© 2016 Optical Society of America

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