title: Universality of spectra for interacting quantum chaotic systems.
abstract: We analyze a model quantum dynamical system subjected to periodic interaction with an environment, which can describe quantum measurements. Under the condition of strong classical chaos and strong decoherence due to large coupling with the measurement device, the spectra of the evolution operator exhibit an universal behavior. A generic spectrum consists of a single eigenvalue equal to unity, which corresponds to the invariant state of the system, while all other eigenvalues are contained in a disk in the complex plane. Its radius depends on the number of the Kraus measurement operators and determines the speed with which an arbitrary initial state converges to the unique invariant state. These spectral properties are characteristic of an ensemble of random quantum maps, which in turn can be described by an ensemble of real random Ginibre matrices. This will be proven in the limit of large dimension.
authors.affiliation: Mark Kac Complex Systems Research Centre, Institute of Physics, Jagiellonian University, 30-059 Kraków, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Bruzda
authors.forename: Marek
authors.initials: M
authors.lastname: Smaczyński
authors.forename: Valerio
authors.initials: V
authors.lastname: Cappellini
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Sommers
authors.forename: Karol
authors.initials: K
authors.lastname: Zyczkowski