title: Zeno and anti-zeno polarization control of spin ensembles by induced dephasing.
abstract: We experimentally and theoretically demonstrate the purity (polarization) control of qubits entangled with multiple spins, using induced dephasing in nuclear magnetic resonance setups to simulate repeated quantum measurements. We show that one may steer the qubit ensemble towards a quasiequilibrium state of a certain purity by choosing suitable time intervals between dephasing operations. These results demonstrate that repeated dephasing at intervals associated with the anti-Zeno regime leads to ensemble purification, whereas those associated with the Zeno regime lead to ensemble mixing.
authors.affiliation: Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina.
authors.forename: Gonzalo A
authors.initials: GA
authors.lastname: Alvarez
authors.forename: D D Bhaktavatsala
authors.initials: DD
authors.lastname: Rao
authors.forename: Lucio
authors.initials: L
authors.lastname: Frydman
authors.forename: Gershon
authors.initials: G
authors.lastname: Kurizki