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Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 323
/
3
/
a
/
ii
/
1
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2021
iii
Paper 323
3
a
ii
2026-09-28
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Table of contents
Solution
1
Solution
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0
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1
Conjugation
by
σ
z
maps
(
r
x
,
r
y
,
r
z
)
to
(
−
r
x
,
−
r
y
,
r
z
)
. The
phase-flip channel
therefore acts on the
Bloch vector
as
(
r
x
,
r
y
,
r
z
)
⟼
((
1
−
2
p
)
r
x
,
(
1
−
2
p
)
r
y
,
r
z
)
.
(1)
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(12)
ii
a
3
Paper 323
iii
2021
Past exam of the mathematics course of the University of Cambridge
Mathematics course of the University of Cambridge
Course of the University of Cambridge
University of Cambridge
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