Quantum quasi-Zeno dynamics: Transitions mediated by frequent projective measurements near the Zeno regime

T. J. Elliott, V. Vedral

Research output: Contribution to journalArticlepeer-review

Abstract

Frequent observation of a quantum system leads to quantum Zeno physics, where the system evolution is constrained to states commensurate with the measurement outcome. We show that, more generally, the system can evolve between such states through higher-order virtual processes that pass through states outside the measurement subspace. We derive effective Hamiltonians to describe this evolution, and the dependence on the time between measurements. We demonstrate application of this phenomena to prototypical quantum many-body system examples, spin chains and atoms in optical lattices, where it facilitates correlated dynamical effects.
Original languageEnglish
Article number012118
Number of pages11
JournalPhysical Review A: Atomic, Molecular, and Optical Physics
Volume94
Issue number1
DOIs
Publication statusPublished - 27 Jul 2016

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