338 citations
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6 papers · 2 filters
Quantitative complementarity between local and nonlocal character of quantum states in a three-qubit system
Xinhua Peng, Jingfu Zhang, Jiangfeng Du +1
Local or nonlocal character of quantum states can be quantified and is subject to various bounds that can be formulated as complementarity relations. Here, we investigate the local…
Generalization of short coherent control pulses: extension to arbitrary rotations
S. Pasini, G. S. Uhrig
We generalize the problem of the coherent control of small quantum systems to the case where the quantum bit (qubit) is subject to a fully general rotation. Following the ideas dev…
Measuring complete quantum states with a single observable
Xinhua Peng, Jiangfeng Du, Dieter Suter
Experimental determination of an unknown quantum state usually requires several incompatible measurements. However, it is also possible to determine the full quantum state from a s…
NMR implementation of Factoring Large Numbers with GaußSums: Suppression of Ghost Factors
Xinhua Peng, Dieter Suter
Finding the factors of an integer can be achieved by various experimental techniques, based on an algorithm developed by Schleich et al., which uses specific properties of Gaußsums…
Numerical Analysis of Optimized Coherent Control Pulses
P. Karbach, S. Pasini, G. S. Uhrig
Numerically we simulate the effect of optimized coherent control pulses with a finite duration on a qubit in a bath of spins. The pulses of finite duration are compared with ideal…
Exact Results on Dynamical Decoupling by -Pulses in Quantum Information Processes
Götz S. Uhrig
The aim of dynamical decoupling consists in the suppression of decoherence by appropriate coherent control of a quantum register. Effectively, the interaction with the environment…