Multi-user quantum key distribution Multi-user quantum key distribution with a semi-conductor source of with a semi-conductor source of entangled photon pairs entangled photon pairs C. Autebert 1 , J. Trapateau 2 , A. Orieux 2 , A. Lemaître 3 , C. Gomez-Carbonell 3 , E. Diamanti 2 , I. Zaquine 2 , and S. Ducci 1 1 Laboratoire MPQ, Université Paris Diderot, Sorbonne Paris Cité, CNRS-UMR 7162, Paris 2 LTCI, CNRS, Télécom ParisTech, Université Paris-Saclay, Paris 3 Centre de Nanosciences et de Nanotechnologies, CNRS/Université Paris Sud, UMR 9001, Marcoussis QuPa – jeudi 7 juillet 2016 – Adeline Orieux 01/22 arXiv:1607.01693
24
Embed
Multi-user quantum key distribution with a semi-conductor ...
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Multi-user quantum key distribution Multi-user quantum key distribution with a semi-conductor source of with a semi-conductor source of
entangled photon pairsentangled photon pairs
C. Autebert1, J. Trapateau2, A. Orieux2, A. Lemaître3, C. Gomez-Carbonell3, E. Diamanti2, I. Zaquine2, and S. Ducci1
1 Laboratoire MPQ, Université Paris Diderot, Sorbonne Paris Cité, CNRS-UMR 7162, Paris2 LTCI, CNRS, Télécom ParisTech, Université Paris-Saclay, Paris3 Centre de Nanosciences et de Nanotechnologies, CNRS/Université Paris Sud, UMR 9001, Marcoussis
QuPa – jeudi 7 juillet 2016 – Adeline Orieux 01/22
arXiv:1607.01693
I/ QKD, why BBM92?
II/ Practical integrated sources for QKD:AlGaAs source of entangled photon pairs at Telecom wavelength
III/ Optimising the use of quantum ressources:Multi-user entanglement distribution with DWDM techniques
IV/ Set-up & Experimental results
V/ Perspectives
OutlineOutline
QuPa – jeudi 7 juillet 2016 – Adeline Orieux 02/22
H/V
+/–
I/ Quantum Key DistributionI/ Quantum Key Distribution
• BB84 → QKD with single photons: non-commutation of σz and σx
01
11
01
1
H
V
–
+
t1t2t3t4t5t6t7
attenuated laser diodes (cheap single photons)single-photon detectors (expensive...)limited distance (losses/noise)lots of hardware-related attacks
C.H. Bennett & G. Brassard, Proc. IEEE Comp., Syst. & Signal Process. 175, 8 (1984).
QuPa – jeudi 7 juillet 2016 – Adeline Orieux 03/22
I/ Quantum Key DistributionI/ Quantum Key Distribution
• BBM92 → QKD with photon pairs: entanglement (& non-locality)
??
?t1t2t3
C.H. Bennett, G. Brassard & N.D. Mermin, Phys. Rev. Lett. 68, 557-559 (1992).
|Ψ⟩AB
H/V
+/–?
??t1 t2 t3
quantum server
|Ψ⟩AB = =|HV⟩ – |VH⟩
√2
|+–⟩ – |–+⟩
√2
QuPa – jeudi 7 juillet 2016 – Adeline Orieux 04/22
II/ Practical integrated sources for QKDII/ Practical integrated sources for QKD
E. Diamanti, H.-K. Lo, B. Qi & Z. Yuan, arXiv:1606.05853, Review (2016).A. Orieux & E. Diamanti, arXiv:1606.07346, to appear in J. Opt. – Topical Review (2016).
QuPa – jeudi 7 juillet 2016 – Adeline Orieux 05/22
• wide deployment of QKD → need for cheap, easy-to-operate systems
∘ standard Telecom/computing components∘ mass-manufacturing possibilities∘ room temperature operation∘ alignment-free operation∘ ...