Fault tolerant two-step quantum secure direct communication protocol against collective noises |
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| Authors: | YANG ChunWei TSAI ChiaWei & HWANG Tzonelih |
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| Institution: | YANG ChunWei,TSAI ChiaWei & HWANG Tzonelih Department of Computer Science and Information Engineering,National Cheng Kung University,Taiwan,China |
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| Abstract: | This work proposes two fault tolerant quantum secure direct communication (QSDC) protocols which are robust against two kinds of collective noises: the collective-dephasing noises and the collective-rotation noises, respectively. The two QSDC protocols are constructed from four-qubit DF states which consist of two logical qubits. The receiver simply performs two Bell state measurements (rather than four-qubit joint measurements) to obtain the secret message. The protocols have qubit effciency twice that of ... |
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| Keywords: | collective noise quantum secure direct communication quantum cryptography |
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