Quantum information processing with quantum zeno many-body dynamics (pp0201-0222)
          Alex Monras and Oriol Romero-Isart
          doi: https://doi.org/10.26421/QIC10.3-4-3
Abstracts: We show how the quantum Zeno effect can be exploited to control quantum many-body dynamics for quantum information and computation purposes. In particular, we consider a one dimensional array of three level systems interacting via a nearest-neighbour interaction. By encoding the qubit on two levels and using simple projective frequent measurements yielding the quantum Zeno effect, we demonstrate how to implement a well defined quantum register, quantum state transfer on demand, universal two-qubit gates and two-qubit parity measurements. Thus, we argue that the main ingredients for universal quantum computation can be achieved in a spin chain with an always-on and constant many-body Hamiltonian. We also show some possible modifications of the initially assumed dynamics in order to create maximally entangled qubit pairs and single qubit gates.
Key words: quantum information & computation, quantum zeno effect, many-body dynamics, spin chains