Limit theorems for quantum trajectories

Tristan Benoist, Jan-Luka Fatras and Clément Pellegrini

Stochastic Processes and their Applications, 2023, vol. 164, issue C, 288-310

Abstract: Quantum trajectories are Markov processes modeling the evolution of a quantum system subjected to repeated independent measurements. Under purification and irreducibility assumptions, these Markov processes admit a unique invariant measure — see Benoist et al. (2019). In this article we prove finer limit theorems such as Law of Large Numbers (LLN), Functional Central Limit Theorem, Law of Iterated Logarithm and Moderate Deviation Principle. The proof of the LLN is based on Birkhoff’s ergodic theorem and an analysis of harmonic functions. The other theorems are proved using martingale approximation of empirical sums.

Date: 2023
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DOI: 10.1016/j.spa.2023.07.014

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