Dominique Elser Qcrypt Washington, D.C. 14 September 2016 Quantum-limited Measurements of Signals from a Satellite in Geostationary Earth Orbit
Quantum Information ProcessingLeuchs Division
Dominique ElserQcrypt Washington, D.C.
14 September 2016
Quantum-limited Measurements of Signals from a Satellite in Geostationary Earth Orbit
Quantum Information ProcessingLeuchs Division
MPL Free Space Quantum Comm.
2000Lab
2007100 m
20091.6km
201639 Mm
201526 km
Quantum Information ProcessingLeuchs Division
Erlangen, Germany
C. Peuntinger, B. Heim, et al., PRL 113, 060502 (2014).B. Heim, C. Peuntinger, et al., NJP 16, 113018 (2014).
B92 BPSKBB84 QPSK
Squeezed States HomodyneStokes
Detection
Quantum Information ProcessingLeuchs Division
Channel Transmission Histogram
V. C. Usenko et al., NJP 14, 093048 (2012).B. Heim, C. Peuntinger et al., NJP 16, 113018 (2014).
Quantum Information ProcessingLeuchs Division
European Data Relay System (EDRS) / GlobeNet
Laser Communication Terminal (LCT) on Alphasat, EDRS and Copernicus
LCT very close to MPL systemCollaboration with Tesat/DLR
BPSK homodyne
Quantum Information ProcessingLeuchs Division
Teide Observatory Tenerife, Spain
TDP1 LCT
AlphasatGEO@25°E
Teide Observatory Tenerife, Spain
TDP1 LCT
Alphasat
GEO25°E
Quantum Information ProcessingLeuchs Division
Space-Ground-Link
K. Günthner, I. Khan, et al., arXiv:1608.03511 [quant-ph] (2016).
Quantum Information ProcessingLeuchs Division
B92 BPSK Protocol in Phase Space
Bit 0 Bit 1
I, X
Q, P
| ⟩𝛼𝛼| ⟩˗𝛼𝛼
Quantum Information ProcessingLeuchs Division
Alphasat Signal Measurements
K. Günthner, I. Khan, et al., arXiv:1608.03511 [quant-ph] (2016).
Quantum Information ProcessingLeuchs Division
Bounds on atmospheric influence
upper bound for atmospheric influence: 0.8 ± 2.4above the quantum uncertainty of the vacuum state
K. Günthner, I. Khan, et al., arXiv:1608.03511 [quant-ph] (2016).
Quantum Information ProcessingLeuchs Division
Status Global High-Speed Q-Com
• Feasibility analysis (2012)• Terrestrial quantum link in MPL testbed (2013)• Lab tests with sat-receiver (2015)• Field tests with ground station (2015)• Terrestrial quantum link with ground station (2015)• Quantum measurements of Alphasat signals (2016)• Optimized quantum receiver (2016+)• Quantum Add-on to Tesat/DLR LCT (2016+)
Quantum Information ProcessingLeuchs Division
Gazing for | ⟩𝛼𝛼 -Sat
Kevin GünthnerImran Khan
Dominique ElserBirgit Stiller
Ömer BayraktarChristian R. Müller
Karen SauckeDaniel Tröndle
Frank HeineStefan Seel
Peter GreulichHerwig ZechBjörn GütlichInes Richter
Sabine Philipp-MayChristoph Marquardt
Gerd LeuchsK. Günthner, I. Khan, et al., arXiv:1608.03511 [quant-ph] (2016).