« Distribution quantique des clés » : différence entre les versions


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==en construction==
 
#REDIRECTION [[Distribution quantique de clés]]
 
[[Catégorie:GRAND_LEXIQUE_FRANÇAIS]]
 
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==[[:Catégorie:Quantique| '''INFORMATIQUE QUANTIQUE''']]==


== Définition ==
== Définition ==
XXXXXXXXX
La science de l'exploitation des propriétés [[mécanique quantique|mécaniques quantiques]] pour effectuer des tâches cryptographiques.


== Français ==
== Français ==
''' XXXXXXXXX '''
'''distribution quantique des clés'''
 
'''cryptographie quantique'''
 
'''chiffrement quantique'''


== Anglais ==
== Anglais ==
''' Quantum key distribution'''
'''quantum key distribution'''


QKD involves sending encrypted data as classical bits over networks, while the keys to decrypt the information are encoded and transmitted in a quantum state using qubits.
'''QKD'''


Various approaches, or protocols, have been developed for implementing QKD. A widely used one known as BB84 works like this. Imagine two people, Alice and Bob. Alice wants to send data securely to Bob. To do so, she creates an encryption key in the form of qubits whose polarization states represent the individual bit values of the key.
'''quantum encryption'''


The qubits can be sent to Bob through a fiber-optic cable. By comparing measurements of the state of a fraction of these qubits—a process known as “key sifting”—Alice and Bob can establish that they hold the same key.
'''quantum cryptography '''
==Sources==
[https://www.technologyreview.com/2019/02/14/103409/what-is-quantum-communications/  Source : technologyreview]


As the qubits travel to their destination, the fragile quantum state of some of them will collapse because of decoherence. To account for this, Alice and Bob next run through a process known as “key distillation,” which involves calculating whether the error rate is high enough to suggest that a hacker has tried to intercept the key.
[https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-fra.html?lang=fra&i=1&srchtxt=Quantum+key+distribution&codom2nd_wet=1#resultrecs  Source : TERMIUM Plus ]


If it is, they ditch the suspect key and keep generating new ones until they are confident that they share a secure key. Alice can then use hers to encrypt data and send it in classical bits to Bob, who uses his key to decode the information.
[https://datafranca.org/images/Comprendre-Informatique-Quantique-Olivier-Ezratty.pdf#page=668  Source : Comprendre l'informatique quantique par  Olivier Ezratty ]




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[https://www.technologyreview.com/2019/02/14/103409/what-is-quantum-communications/  Source : technologyreview]
{{Modèle:Quantique}}
 


[[Catégorie:Quantique]]
[[Catégorie:Quantique]]
[[Catégorie:vocabulary]]

Dernière version du 20 juillet 2025 à 20:31

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Contributeurs: Claire Gorjux, Marie Alfaro, wiki