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Journal Article

Feasibility of free space quantum key distribution with coherent polarization states

MPS-Authors
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Elser,  D.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Heim,  B.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Sych,  D.
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  G.
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Elser, D., Bartley, T., Heim, B., Wittmann, C., Sych, D., & Leuchs, G. (2009). Feasibility of free space quantum key distribution with coherent polarization states. NEW JOURNAL OF PHYSICS, 11: 045014. doi:10.1088/1367-2630/11/4/045014.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6BF7-5
Abstract
We demonstrate for the first time the feasibility of free space quantum key distribution with continuous variables under real atmospheric conditions. More specifically, we transmit coherent polarization states over a 100m free space channel on the roof of our institute's building. In our scheme, signal and local oscillator (LO) are combined in a single spatial mode, which auto-compensates atmospheric fluctuations and results in an excellent interference. Furthermore, the LO acts as a spatial and spectral filter, thus allowing unrestrained daylight operation.