Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Optics I
Q 4.4: Vortrag
Montag, 6. März 2017, 15:30–15:45, P 5
Overcoming Vacuum Noise: The Unforeseen Benefits of Quantum Heterodyne Detection — •Christian R. Müller1,2, Christian Peuntinger1,2,3, Thomas Dirmeir1,2, Imran Khan1,2, Ulrich Vogl1,2, Christoph Marquradt1,2, Gerd Leuchs1,2, Luis L. Sánchez-Soto4,1, Yong S. Teo5, Zdenek Hradil5, and Jaroslav Rehacek5 — 1Max Planck Institute for the Science of Light, Erlangen, Germany. — 2Department of Physics, University of Erlangen-Nuremberg (FAU), Germany. — 3Department of Physics, University of Otago, New Zealand. — 4Departamento de Óptica, Facultad de Física, Universidad Complutense, Madrid, Spain. — 5Department of Optics, Palacky University, Olomouc, Czech Republic.
The Wigner function and the Husimi Q-function are theoretically equivalent representations of a quantum state and are intimately linked to homodyne tomography and heterodyne detection, respectively. In state estimation via these measurement techniques one is confronted either with errors incurred during tomogram processing or with additional excess noise due to the simultaneous measurement of conjugate observables. We experimentally demonstrate that, contrary to a common believe, state estimation via heterodyne detection outperforms homodyne tomography for almost all Gaussian states.
[1] J. Řeháček et al., Sci. Rep., 5, 12289 (2015).
[2] C. R. Müller et al., Phys. Rev. Lett. 117, 070801 (2016)