Time-frequency Quantum Key Distribution over a Free-Space Optical Link
- URL: http://arxiv.org/abs/2112.04306v1
- Date: Wed, 8 Dec 2021 14:37:15 GMT
- Title: Time-frequency Quantum Key Distribution over a Free-Space Optical Link
- Authors: Jasper R\"odiger, Nicolas Perlot, Oliver Benson, Ronald Freund
- Abstract summary: TF-QKD is implemented with modulations in time and frequency.
We demonstrate free-space optical QKD transmission over a 388-m distance.
- Score: 0.4333137905976939
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We present an implementation of the time-frequency (TF) quantum key
distribution (QKD) protocol realized mainly with standard telecommunication
components at 1550 nm. TF-QKD is implemented with modulations in time and
frequency, namely pulse position modulation (PPM) and frequency shift keying
(FSK). The time-frequency uncertainty relation ensures the security of the
protocol. We further demonstrate free-space optical QKD transmission over a
388-m distance. Since the QKD setup is single-mode fiber (SMF) -based, precise
coupling in and out of the SMFs is crucial. Thus, we implemented an optical
tracking system. The QKD signal is wavelength-multiplexed with a strong beacon
for optical tracking. Strong spectral filtering is necessary to separate beacon
and QKD signal. Together with spatial filtering caused by the SMF most
background light is filtered, enabling daylight QKD transmission.
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