10 papers
Quantum instanton approach to metastable collective spins
Krzysztof Ptaszynski, Maciej Chudak, Massimiliano Esposito
Collective spin systems -- spin ensembles coupled to a common reservoir and effectively described by a single macrospin -- play an important role in both atomic and solid-state phy…
Synchronization of thermodynamically consistent stochastic phase oscillators
Maciej Chudak, Massimiliano Esposito, Krzysztof Ptaszynski
We consider a toy model of two kinetically coupled stochastic oscillators whose dynamics is described as a Markov jump process among discrete phase states. For large , it ma…
Nonequilibrium fluctuation-response relations for state observables
Krzysztof Ptaszynski, Timur Aslyamov, Massimiliano Esposito
Time-integrated state observables, which quantify the fraction of time spent by the system in a specific pool of states, are important in many fields, such as chemical sensing or t…
Nonequilibrium fluctuation-response relations for state-current correlations
Krzysztof Ptaszynski, Timur Aslyamov, Massimiliano Esposito
Recently, novel exact identities known as Fluctuation-Response Relations (FRRs) have been derived for nonequilibrium steady states of Markov jump processes. These identities link t…
Macroscopic theory of multipartite correlations in permutation-invariant open quantum systems
Krzysztof Ptaszynski, Maciej Chudak, Massimiliano Esposito
Information-theoretic quantities have received significant attention as system-independent measures of correlations in many-body quantum systems, e.g., as universal order parameter…
Macroscopic fluctuation-response theory and its use for gene regulatory networks
Timur Aslyamov, Krzysztof PtaszyÅski, Massimiliano Esposito
Gaussian macroscopic fluctuation theory underpins the understanding of noise in a broad class of nonequilibrium systems. We derive exact fluctuation-response relations linking the…