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Multiple choice
For the toric code on an
L
×
L
L \times L
L
×
L
square lattice with
L
=
4
L = 4
L
=
4
: one qubit lives on each edge so
n
=
2
L
2
n = 2L^2
n
=
2
L
2
, the genus-1 torus encodes
k
=
2
k = 2
k
=
2
logical qubits, and the code distance is the shortest non-contractible loop
d
=
L
d = L
d
=
L
. What is
n
+
k
+
d
n + k + d
n
+
k
+
d
?
22
38
20
42
Check answer