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Conference Paper

All Photons are Equal but Some Photons are More Equal Than Others

MPS-Authors
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Toeppel,  F.
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Aiello,  A.
Optical Quantum Information Theory, 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

Toeppel, F., Aiello, A., & Leuchs, G. (2013). All Photons are Equal but Some Photons are More Equal Than Others. In 2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR). 345 E 47TH ST, NEW YORK, NY 10017 USA: IEEE.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-67CF-C
Abstract
Two photons are identical if they are prepared in the same quantum state and there is a unique way to achieve this. Conversely, there are many different ways of preparing two non-identical photons: they may differ in polarization, frequency, mode-function, etc. Thus, photon distinguishability depends upon the degree of freedom being varied. By analyzing the coincidence probability distribution in a Hong-Ou-Mandel experiment, we show that photon distinguishability can be quantified by the rate of distinguishability of photons, an experimentally measurable parameter that crucially depends on both the photon-quantum state and the degree of freedom under control.