How well can you know the edge of a quantum pyramid?
英文摘要：
The methods of quantum cryptography enable one to have perfectly secure communication lines, whereby the laws of quantum physics protect the privacy of the data exchanged. Each quantum-cryptography scheme has its own security criteria that need to be met in a practical implementation. We find, however, that the generally accepted criteria are flawed for a whole class of such schemes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
