Equation 14 · Part 1 · Error Correction Is the Whole Problem in Quantum Computing
Symbol n_phys
What this part means
the physical cost of one logical qubit.
Its job in the formula
hys is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol n_phys→Article meaning
Where the article explains it
For the planar surface code in its standard rotated layout, the physical cost of one logical qubit is
The passage around this formula
Distance d is the weight of the smallest undetectable logical error. A distance- d code corrects up to (d-1)/2 errors. For the planar surface code in its standard rotated layout, the physical cost of one logical qubit is . counting data and measure qubits together. A distance-7 patch therefore occupies ninety-seven physical qubits, and that is a memory holding one logical qubit, doing nothing else. It performs no gate, produces no non-Clifford operation, and reserves no routing space.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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