3 papers
quant-ph2018
Measurement-Disturbance Tradeoff Outperforming Optimal Cloning
Lukas Knips, Jan Dziewior, Anna-Lena K. Hashagen +3
One of the characteristic features of quantum mechanics is that every measurement that extracts information about a general quantum system necessarily causes an unavoidable disturb…
quant-ph2018
Approximate Randomized Benchmarking for Finite Groups
Daniel Stilck França, Anna-Lena Hashagen
We investigate randomized benchmarking in a general setting with quantum gates that form a representation, not necessarily an irreducible one, of a finite group. We derive an estim…
quant-ph2018
Universality and Optimality in the Information-Disturbance Tradeoff
Anna-Lena K. Hashagen, Michael M. Wolf
We investigate the tradeoff between the quality of an approximate version of a given measurement and the disturbance it induces in the measured quantum system. We prove that if the…