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Multiple choice
A surface-code computation needs 50 logical qubits at code distance
d
=
15
d=15
d
=
15
. Using the estimate of
2
d
2
2d^2
2
d
2
physical qubits per logical qubit, how many physical qubits are required in total?
11250 (omitting the factor of 2:
50
d
2
50d^2
50
d
2
)
22500
750 (using
d
d
d
instead of
d
2
d^2
d
2
:
50
d
50d
50
d
)
45000 (applying the factor of 2 twice)
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