Monitoring Entanglement Evolution and Collective Quantum Dynamics

Details Monitoring Entanglement Evolution and Collective Quantum Dynamics Monitoring Entanglement Evolution and Collective Quantum Dynamics

2010-07-30

arxiv.org/abs/1007.5493v3

Phys. Rev. B 83, 014303 (2011)

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures

Scientific paper

10.1103/PhysRevB.83.014303

We generalize a recently developed scheme for monitoring coherent quantum dynamics with good time-resolution and low backaction [Reuther et al., Phys. Rev. Lett. 102, 033602 (2009)] to the case of more complex quantum dynamics of one or several qubits. The underlying idea is to measure with lock-in techniques the response of the quantum system to a high-frequency ac field. We demonstrate that this scheme also allows one to observe quantum dynamics with many frequency scales, such as that of a qubit undergoing Landau-Zener transitions. Moreover, we propose how to measure the entanglement between two qubits as well as the collective dynamics of qubit arrays.

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