Fig. 6: Characteristics of the 9-qubit codes and encodings found by the noise-aware meta-agent post-selected for minimizing the failure probability. | npj Quantum Information

Fig. 6: Characteristics of the 9-qubit codes and encodings found by the noise-aware meta-agent post-selected for minimizing the failure probability.

From: Simultaneous discovery of quantum error correction codes and encoders with a noise-aware reinforcement learning agent

Fig. 6

a Associated code family according to their (symmetric) weight enumerators A, B. The same code family is used from 0.5 ≤ cZ < 0.9, while a family switching occurs at cZ = 0.9, and it is kept until cZ = 2. b Encoding circuits: Here we see that many small gate sequences (highlighted with different colors) are reused across different values of cZ. This is an indication of transfer learning, i.e., the power of the meta-agent. We remark that the agent does not place gates in parallel, the circuits shown here show gates in parallel for compactness. c Corresponding code generators. To aid visualization, we have chosen different colors for different Pauli matrices. However, since our scenario is by construction symmetric in X/Y, we choose to represent X and Y by the same color. Code generators gi corresponding to the encoding circuits, where we do not make a distinction between X or Y. Here we see that the code generators gi vary across different values of cZ.

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