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Multiple choice
A 2-qubit system is in the maximally mixed state
ρ
=
I
/
4
\rho = I/4
ρ
=
I
/4
, i.e. all four eigenvalues equal
1
/
4
1/4
1/4
. What is its von Neumann entropy
S
=
−
∑
λ
log
2
(
λ
)
S = -\sum \lambda \log_2(\lambda)
S
=
−
∑
λ
lo
g
2
(
λ
)
, in bits?
4
2
0.5
1
Check answer