Quantum Information Processing with Quantum Zeno Many-Body Dynamics

Details Quantum Information Processing with Quantum Zeno Many-Body Dynamics Quantum Information Processing with Quantum Zeno Many-Body Dynamics

2008-01-13

arxiv.org/abs/0801.1959v2

Quant. Inf. Comp. 10, 201 (2010)

Physics

Quantum Physics

13 pages, 8 figures. Significantly extended, including two-qubit gates and parity measurements. To appear in Quantum Informati

Scientific paper

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.

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