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Network Coding and Common Randomness
Mixing packets inside the network instead of forwarding them, and distilling shared secrecy from correlated observations.
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The asymptotic BB84 key rate is
r
=
1
−
2
h
2
(
e
)
r = 1 - 2h_2(e)
r
=
1
−
2
h
2
(
e
)
.
With observed error rate
e
=
0.05
e = 0.05
e
=
0.05
and
h
2
(
0.05
)
≈
0.2864
h_2(0.05) \approx 0.2864
h
2
(
0.05
)
≈
0.2864
,
compute
r
r
r
to four decimal places.
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r
( )
x
n
√
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AC
7
8
9
+
4
5
6
−
1
2
3
×
0
.
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b
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