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Bad Qubits
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Multiple choice
In the rotated surface-code layout, a patch encoding one logical qubit at distance
d
d
d
uses
d
2
d^2
d
2
data qubits and
d
2
−
1
d^2 - 1
d
2
−
1
ancilla qubits. How many physical qubits does the smallest useful patch,
d
=
3
d = 3
d
=
3
, need in total?
17 (9 data + 8 ancilla)
9 (all data, no ancilla)
18 (9 data + 9 ancilla)
3 (one qubit per unit of distance)
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