Scruby, TR; Browne, DE; Webster, P; Vasmer, M; (2022) Numerical Implementation of Just-In-Time Decoding in Novel Lattice Slices Through the Three-Dimensional Surface Code. Quantum , 6 , Article 721. 10.22331/q-2022-05-24-721.

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Abstract

We build on recent work by B. Brown (Sci. Adv. 6, eaay4929 (2020)) to develop and simulate an explicit recipe for a just-in-time decoding scheme in three 3D surface codes, which can be used to implement a transversal (non-Clifford) CCZ between three 2D surface codes in time linear in the code distance. We present a fully detailed set of bounded-height lattice slices through the 3D codes which retain the code distance and measurement-error detecting properties of the full 3D code and admit a dimensionjumping process which expands from/collapses to 2D surface codes supported on the boundaries of each slice. At each timestep of the procedure the slices agree on a common set of overlapping qubits on which CCZ should be applied. We use these slices to simulate the performance of a simple JIT decoder against stochastic X and measurement errors and find evidence for a threshold pc ∼ 0.1% in all three codes. We expect that this threshold could be improved by optimisation of the decoder

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