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BananaworldQuantum Mechanics for Primates$
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Jeffrey Bub

Print publication date: 2016

Print ISBN-13: 9780198718536

Published to Oxford Scholarship Online: March 2016

DOI: 10.1093/acprof:oso/9780198718536.001.0001

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Quantum Secrets

Quantum Secrets

Chapter:
(p.149) 7 Quantum Secrets
Source:
Bananaworld
Author(s):

Jeffrey Bub

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198718536.003.0007

Classical physics cannot guarantee the security of a procedure for distributing a cryptographic key between two parties. In a quantum world, any attempt by Eve to eavesdrop on communications between Alice and Bob can be revealed. The chapter shows how Alice and Bob can share secrets with unconditional security in Bananaworld by exploiting the “monogamous” correlations of Popescu–Rohrlich bananas, and discusses a protocol by Ekert that exploits the monogamy of entanglement in our quantum world to allow Alice and Bob to share a secret key. Finally, the chapter shows how this can be extended to a device-independent scenario, where Alice and Bob can share a secret key even if they suspect that the devices they use to prepare and measure entangled quantum states are insecure and might have been supplied by an adversary.

Keywords:   one-time pad, cryptographic key, cyphertext, plaintext, key distribution problem, privacy amplification, eavesdropper, monogamy, Ekert protocol, device-independent cryptography

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