TY  - JOUR
AU  - Fiorelli, Eliana
AU  - Lesanovsky, Igor
AU  - Müller, Markus
TI  - Phase diagram of quantum generalized Potts-Hopfield neural networks
JO  - New journal of physics
VL  - 24
SN  - 1367-2630
CY  - [London]
PB  - IOP
M1  - FZJ-2022-01352
SP  - 033012
PY  - 2022
AB  - We introduce and analyze an open quantum generalization of the q-state Potts-Hopfield neural network, which is an associative memory model based on multi-level classical spins. The dynamics of this many-body system is formulated in terms of a Markovian master equation of Lindblad type, which allows to incorporate both probabilistic classical and coherent quantum processes on an equal footing. By employing a mean field description we investigate how classical fluctuations due to temperature and quantum fluctuations effectuated by coherent spin rotations affect the ability of the network to retrieve stored memory patterns. We construct the corresponding phase diagram, which in the low temperature regime displays pattern retrieval in analogy to the classical Potts-Hopfield neural network. When increasing quantum fluctuations, however, a limit cycle phase emerges, which has no classical counterpart. This shows that quantum effects can qualitatively alter the structure of the stationary state manifold with respect to the classical model, and potentially allow one to encode and retrieve novel types of patterns.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000766853300001
DO  - DOI:10.1088/1367-2630/ac5490
UR  - https://juser.fz-juelich.de/record/906298
ER  -