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arXiv:2102.11945 · Quantum Information Processing

Quantum algorithm for quantum state discrimination via partial negation and weak measurement

Doha A. Rizk, Ahmed Younes

Published Sep 1, 2021• 4 citations
arXivHTMLPDF
DOI
10.1007/s11128-021-03245-3

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In a recent paper (Scheme of the arrangement for attack on the protocol BB84, Optik 127(18):7083-7087, Sept 2016), a protocol was proposed for using weak measurement to attack BB84. This claimed the four basis states typically used could be perfectly discriminated, and so an interceptor could obtain all information carried. We show this attack fails when considered using standard quantum mechanics, as expected - such ``single-shot' quantum state discrimination is impossible, even using weak measurement.