Tuesday, June 11, 2013

1306.2145 (Yu-Ran Zhang et al.)

Quantum Zeno dynamics of noisy quantum channel    [PDF]

Yu-Ran Zhang, Heng Fan
The quantum Zeno effect shows that frequent observations can slow down or even stop the unitary time evolution of an unstable quantum system. We investigate the quantum Zeno dynamics of the system which experiences a specific quantum dynamical map in an open system. An achievable upper bound of the quantum Zeno time is given via the variational methods stemming from the noisy quantum metrology. We exemplify that the maximal entangled states interacting with an appropriate model of environment can have a longer quantum Zeno time than the ones in closed system. It is of interest in that the noise affecting the accuracy in the entanglement-enhanced parameter estimation can conversely be favorable for the quantum Zeno dynamics of entangled states.
View original: http://arxiv.org/abs/1306.2145

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