Full Counting Statistics of Charge in Chaotic Many-Body Quantum Systems

Ewan Mcculloch, Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We investigate the full counting statistics of charge transport in U(1)-symmetric random unitary circuits. We consider an initial mixed state prepared with a chemical potential imbalance between the left and right halves of the system and study the fluctuations of the charge transferred across the central bond in typical circuits. Using an effective replica statistical mechanics model and a mapping onto an emergent classical stochastic process valid at large on-site Hilbert space dimension, we show that charge transfer fluctuations approach those of the symmetric exclusion process at long times, with subleading t-1/2 quantum corrections. We discuss our results in the context of fluctuating hydrodynamics and macroscopic fluctuation theory of classical nonequilibrium systems and check our predictions against direct matrix-product state calculations.

Original languageEnglish (US)
Article number210402
JournalPhysical review letters
Issue number21
StatePublished - Nov 24 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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