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dc.contributor.authorMarsh, Brendan P.
dc.contributor.authorGuo, Yudan
dc.contributor.authorKroeze, Ronen M.
dc.contributor.authorGopalakrishnan, Sarang
dc.contributor.authorGanguli, Surya
dc.contributor.authorKeeling, Jonathan
dc.contributor.authorLev, Benjamin L.
dc.identifier.citationMarsh , B P , Guo , Y , Kroeze , R M , Gopalakrishnan , S , Ganguli , S , Keeling , J & Lev , B L 2021 , ' Enhancing associative memory recall and storage capacity using confocal cavity QED ' , Physical Review X , vol. 11 , no. 2 , 021048 .
dc.identifier.otherORCID: /0000-0002-4283-552X/work/96141269
dc.descriptionFunding: Y.G. and B.M. acknowledgefunding from the Stanford Q-FARM Graduate Student Fellowship and the NSF Graduate Research Fellowship, respectively. J.K. acknowledges support from the Leverhulme Trust (IAF-2014-025), and S.G. acknowledges funding from the James S. McDonnell and Simons Foundations and an NSF Career Award.en
dc.description.abstractWe introduce a near-term experimental platform for realizing an associative memory. It can simultaneously store many memories by using spinful bosons coupled to a degenerate multimode optical cavity. The associative memory is realized by a confocal cavity QED neural network, with the modes serving as the synapses, connecting a network of superradiant atomic spin ensembles,which serve as the neurons. Memories are encoded in the connectivity matrix between the spins and can be accessed through the input and output of patterns of light. Each aspect of the scheme is based on recently demonstrated technology using a confocal cavity and Bose-condensed atoms. Our scheme has two conceptually novel elements. First, it introduces a new form of random spin system that interpolates between a ferromagnetic and a spin glass regime as a physical parameter is tuned—the positions of ensembles within the cavity. Second, and more importantly, the spins relax via deterministic steepest-descent dynamics rather than Glauber dynamics. We show that this nonequilibrium quantum-optical scheme has significant advantages for associative memory over Glauber dynamics: These dynamics can enhance the network’s ability to store and recall memories beyond that of the standard Hopfield model. Surprisingly, the cavity QED dynamics can retrieve memories even when the system is in the spin glass phase. Thus, the experimental platform provides a novel physical instantiation of associative memories and spin glasses as well as provides an unusual form of relaxational dynamics that is conducive to memory recall even in regimes where it was thought to be impossible.
dc.relation.ispartofPhysical Review Xen
dc.subjectAtomic and molecular physicsen
dc.subjectQuantum physicsen
dc.subjectStatistical physicsen
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleEnhancing associative memory recall and storage capacity using confocal cavity QEDen
dc.typeJournal articleen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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