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15 papers · 2 filters
Rigorous Performance Bounds for Quadratic and Nested Dynamical Decoupling
Yuhou Xia, Gotz S. Uhrig, Daniel A. Lidar
We present rigorous performance bounds for the quadratic dynamical decoupling (QDD) pulse sequence which protects a qubit from general decoherence, and for its nested generalizatio…
Frequency modulated pulses for quantum bits coupled to time-dependent baths
Benedikt Fauseweh, Stefano Pasini, Götz S. Uhrig
We consider the coherent control of a quantum bit by the use of short pulses with finite duration τ_p. By shaping the pulse, we perturbatively decouple the dynamics of the bath fro…
Constraints on measurement-based quantum computation in effective cluster states
D. Klagges, K. P. Schmidt
The aim of this work is to study the physical properties of a one-way quantum computer in an effective low-energy cluster state. We calculate the optimal working conditions as a fu…
Perfect state transfer in XX chains induced by boundary magnetic fields
Thorben Linneweber, Joachim Stolze, Götz S. Uhrig
A recent numerical study of short chains found near-perfect quantum state transfer between the boundary sites of a spin-1/2 XX chain if a sufficiently strong magnetic field acts on…
Spin chains for robust state transfer: Modified boundary couplings vs. completely engineered chains
Analia Zwick, Gonzalo A. Alvarez, Joachim Stolze +1
Quantum state transfer in the presence of noise is one of the main challenges in building quantum computers. We compare the quantum state transfer properties for two classes of qub…
Robust dynamical decoupling
Alexandre M. Souza, Gonzalo A. Álvarez, Dieter Suter
Quantum computers, which process information encoded in quantum mechanical systems, hold the potential to solve some of the hardest computational problems. A substantial obstacle f…