Private Quantum Channels and the Cost of Randomizing Quantum Information
Quantum Physics
2007-05-23 v2
Abstract
We investigate how a classical private key can be used by two players, connected by an insecure one-way quantum channel, to perform private communication of quantum information. In particular we show that in order to transmit n qubits privately, 2n bits of shared private key are necessary and sufficient. This result may be viewed as the quantum analogue of the classical one-time pad encryption scheme. From the point of view of the eavesdropper, this encryption process can be seen as a randomization of the original state. We thus also obtain strict bounds on the amount of entropy necessary for randomizing n qubits.
Cite
@article{arxiv.quant-ph/0003101,
title = {Private Quantum Channels and the Cost of Randomizing Quantum Information},
author = {Michele Mosca and Alain Tapp and Ronald de Wolf},
journal= {arXiv preprint arXiv:quant-ph/0003101},
year = {2007}
}
Comments
LaTeX, 10 pages. Minor changes in the typesetting and references