A new non-local unitary encoder grows a rotated surface code from distance d to 2d-1 in four time steps, giving about 43% less depth than the previous best logarithmic-depth encoder.
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A Unitary Encoder for Surface Codes
A new non-local unitary encoder grows a rotated surface code from distance d to 2d-1 in four time steps, giving about 43% less depth than the previous best logarithmic-depth encoder.