New analytical bounds give positive secret key rates for passive-basis-choice BB84 with large detection-efficiency mismatch, including a satellite QKD pass where prior analysis yielded zero.
(27) Consider the positive trace-preserving linear map Φ3(ρ) = 1 2 ρ+R Φ,3ρR+ Φ,3 , (A21) where RΦ,3 = |z⟩ eA⟨z| ⊗XA +|x⟩ eA⟨x| ⊗ZA ⊗ |z⟩ eB⟨z| ⊗XB +|x⟩ eB⟨x| ⊗ZB
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Security of quantum key distribution with passive basis choice and detection-efficiency mismatch for a realistic satellite setup
New analytical bounds give positive secret key rates for passive-basis-choice BB84 with large detection-efficiency mismatch, including a satellite QKD pass where prior analysis yielded zero.