Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing

Details Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing

2010-08-30

arxiv.org/abs/1008.5122v1

Phys. Rev. Lett. 105, 160401 (2010)

Physics

Quantum Physics

Main Text: 5 pages, 2 figures. Sup. Inf.: 5pages, 1 figure

Scientific paper

10.1103/PhysRevLett.105.160401

We experimentally and theoretically demonstrate the purity (polarization) control of qubits entangled with multiple spins, using induced dephasing in nuclear magnetic resonance (NMR) setups to simulate repeated quantum measurements. We show that one may steer the qubit ensemble towards a quasi-equilibrium state of certain purity, by choosing suitable time intervals between dephasing operations. These results demonstrate that repeated dephasing at intervals associated with the anti-Zeno regime lead to ensemble purification, whereas those associated with the Zeno regime lead to ensemble mixing.

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