Explanation of Image:

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This image is from the paper 'Maximum-Entropy Inference with a Programmable Annealer'. This image is based on temperature dependent 'spin-sign transitions' which are expected to occur for certain qubits at temperatures which can be calculated. The figures display the density of these transitions versus the 'transition temperature' and the probability of reaching a result consistent with a low temperature.

The upper plot is for the D-Wave device based at the USC Information Science Institute (ISI), and the bottom plot is the theoretical expectation from sampling a Boltzmann distribution with a finite number of samples. The dashed lines represent values where the direction of the bit can be determined with 95% certainty.

This data suggests that these devices may be useful for 'maximum entropy' computational tasks in which useful information is extracted from the excited states as well as the ground state(s) of the underlying Ising model.

Previous  Images:

Propagation of Disturbances in Degenerate Quantum Systems

propagation of disturbances in degenerate systems