Quantum Computation and Information Seminar 

28/09/2007, 15:00 — 16:00 — Room P4.35, Mathematics Building
Francesco Ciccarello, U Palermo

Entanglement of two spins via repeated injection of flying qubits

We consider a 1D waveguide where flying qubits can undergo multiple scattering between two stationary, distant (pseudo)spin-s quantum systems. We show that iterated injection of such flying particles in a given internal state, together with appropriate post-selection, is able to conditionally generate the maximally entangled singlet state of the two stationary systems initially prepared in a product state. This task can be attained with a significant probability as well as with a small number of injected particles. Two different physical setups able to implement the protocol are proposed.