Effect of atmospheric turbulence on photon states in single photon communication
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1.
School of Science, Jiangnan University, Wuxi 214122, China;
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2.
Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
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Received Date:
2009-11-03
Accepted Date:
2009-12-30
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Abstract
In order to study the change regularity of photon states in atmospheric turbulence,the photon state detection probability was derived based on facts that transverse spatial wave function of Laguerre-Gaussian beam is the eigenfunction of a photon and transverse spatial wave function of Laguerre-Gaussian beam propagation in turbulent atmosphere approaches to superimposition of all photon state eigenfunctions.Effect of atmospheric turbulence,propagation length,quality factor on detection probability was analyzed.The results present that the change of the photon state largely relies on beam quality factor. With the same quality factor,the measurement weight at the receiving plane is nearly the same.In addition,the total measurement weight from initial photon to state at which the orbital angular momentum increases to a certain value,is equivalent to the total measurement weight of the corresponding decrease.The stronger the turbulence is,the smaller the photon state measurement weight of the initial photon state at the receiving side is.That is also true of the propagating distance.However, distance puts much less effect on photon states than atmospheric turbulence.
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