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Global versus local optimality in feedback-controlled qubit purification: new insights from minimizing Rényi entropies
Colin Teo, Joshua Combes, Howard M. Wiseman
It was first shown by Jacobs, in 2003, that the process of qubit state purification by continuous measurement of one observable can be enhanced, on average, by unitary feedback con…
Loss-Tolerant Tests Of Einstein-Podolsky-Rosen-Steering
David A. Evans, Eric G. Cavalcanti, Howard M. Wiseman
We analyse two classes of Einstein-Podolsky-Rosen (EPR)-steering inequalities, the violation of which can be used to demonstrate EPR-steering with an entangled two-qubit Werner sta…
Precision bounds for noisy nonlinear quantum metrology
Marcin Zwierz, Howard M. Wiseman
We derive the ultimate bounds on the performance of nonlinear measurement schemes in the presence of noise. In particular, we investigate the precision of the second-order estimati…
Discord in relation to resource states for measurement-based quantum computation
Eleanor G. Rieffel, Howard M. Wiseman
We consider the issue of what should count as a resource for measurement-based quantum computation (MBQC). While a state that supports universal quantum computation clearly should…
Stochastic Heisenberg limit: Optimal estimation of a fluctuating phase
Dominic W. Berry, Michael J. W. Hall, Howard M. Wiseman
The ultimate limits to estimating a fluctuating phase imposed on an optical beam can be found using the recently derived continuous quantum Cramer-Rao bound. For Gaussian stationar…