Comment on Scheme of the arrangement for attack on the protocol BB84"

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Abstract

In a recent paper (\textit{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.
Original language English 167451 3 Optik 243 17 Jun 2021 https://doi.org/10.1016/j.ijleo.2021.167451 E-pub ahead of print - 17 Jun 2021

Bibliographical note

Funding Information:
This work was supported by the Engineering and Physical Sciences Research Council (Grants EP/P510269/1 , EP/T001011/1 , EP/R513386/1 , EP/M013472/1 and EP/L024020/1 ).

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