Impossibility of Growing Quantum Bit Commitments

Details Impossibility of Growing Quantum Bit Commitments Impossibility of Growing Quantum Bit Commitments

Publishing date

2011-05-05

URL

arxiv.org/abs/1105.1165v2

Journals

Phys. Rev. Lett. 107, 090502 (2011)

Science

Physics

Field

Quantum Physics

Additional info

10 pages, minor changes

Type

Scientific paper

Digital Object Identifier

10.1103/PhysRevLett.107.090502

Abstract

Quantum key distribution (QKD) is often, more correctly, called key growing. Given a short key as a seed, QKD enables two parties, connected by an insecure quantum channel, to generate a secret key of arbitrary length. Conversely, no key agreement is possible without access to an initial key. Here, we consider another fundamental cryptographic task, commitments. While, similar to key agreement, commitments cannot be realized from scratch, we ask whether they may be grown. That is, given the ability to commit to a fixed number of bits, is there a way to augment this to commitments to strings of arbitrary length? Using recently developed information-theoretic techniques, we answer this question to the negative.

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