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Private quantum channels and the cost of randomizing quantum information,” (22-Mar-00) preprint quant-ph/0003101 (2000)
| Citations: | 5 - 0 self |
BibTeX
@MISC{Mosca00privatequantum,
author = {Michele Mosca and Ronald Wolf},
title = {Private quantum channels and the cost of randomizing quantum information,” (22-Mar-00) preprint quant-ph/0003101},
year = {2000}
}
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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. 1
