2010
DOI: 10.1007/978-3-642-11731-2_13
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Abstract: Abstract. In our continuous variable quantum key distribution (QKD) scheme, the homodyne detection set-up requires balancing the intensity of an incident beam between two photodiodes. Realistic lens systems are insufficient to provide a spatially stable focus in the presence of large spatial beam-jitter caused by atmospheric transmission. We therefore present an improved geometry for optical tapers which offer up to four times the angular tolerance of a lens. The effective area of a photodiode can thus be incr… Show more

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Cited by 1 publication
(1 citation statement)
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References 31 publications
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“…Hence we are now working on an optimised detection system to improve free space beam capture. The use of improved optical tapers can combat strong combined spatial and angular fluctuations of the incident beam, better than a single lens could do [32,33]. We have experimental evidence for the non-Gaussian character of the noise, which will be reported elsewhere.…”
Section: Atmospheric Beam Jittersupporting
confidence: 55%
“…Hence we are now working on an optimised detection system to improve free space beam capture. The use of improved optical tapers can combat strong combined spatial and angular fluctuations of the incident beam, better than a single lens could do [32,33]. We have experimental evidence for the non-Gaussian character of the noise, which will be reported elsewhere.…”
Section: Atmospheric Beam Jittersupporting
confidence: 55%