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Strong subadditivity of Von Neumann entropy
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Physics
Branch of physics
Quantum theory
Density operator
Von Neumann entropy
Subadditivity of Von Neumann entropy
Created
2026-09-24
Updated
2026-09-24
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For
a
tripartite
density operator
ρ
A
BC
,
S
(
ρ
A
BC
)
+
S
(
ρ
B
)
≤
S
(
ρ
A
B
)
+
S
(
ρ
BC
)
.
(1)
Equivalently, conditioning on an additional
quantum
system cannot increase
quantum conditional entropy
.
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(7)
Subadditivity of Von Neumann entropy
Von Neumann entropy
Density operator
Quantum theory
Branch of physics
Physics
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Concavity of quantum conditional entropy
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 323
/
4
/
c
/
iv
/
Solution
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