Planar fault-tolerant circuits for non-Clifford gates on the 2D color code

Understand

We introduce a family of scalable planar fault-tolerant circuits that implement logical non-Clifford operations on a 2D color code, such as a logical $T$ gate or a logical non-Pauli measurement that prepares a magic $|T\rangle$ state.

• The circuits are relatively simple, consisting only of physical $T$ gates, $CX$ gates, and few-qubit measurements.
• They can be implemented with an array of qubits on a 2D chip with nearest-neighbor couplings, and no wire crossings.
• The construction is based on a spacetime path integral representation of a non-Abelian 2+1D topological phase, which is related to the 3D color code.