Quantifying scrambling in quantum neural networks

Autor: Garcia, Roy J., Bu, Kaifeng, Jaffe, Arthur
Rok vydání: 2021
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1007/JHEP03(2022)027
Popis: We characterize a quantum neural network's error in terms of the network's scrambling properties via the out-of-time-ordered correlator. A network can be trained by optimizing either a loss function or a cost function. We show that, with some probability, both functions can be bounded by out-of-time-ordered correlators. The gradients of these functions can be bounded by the gradient of the out-of-time-ordered correlator, demonstrating that the network's scrambling ability governs its trainability. Our results pave the way for the exploration of quantum chaos in quantum neural networks.
Databáze: arXiv