194 citations · 703 across the 7 of their papers we have counts for
7 papers
Pure quantum dephasing of a solid state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine-mediated interactions
L. Cywinski, W. M. Witzel, S. Das Sarma
We investigate decoherence due to pure dephasing of a localized spin qubit interacting with a nuclear spin bath. Although in the limit of a very large magnetic field the only decoh…
Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
L. Cywinski, W. M. Witzel, S. Das Sarma
We investigate pure dephasing decoherence (free induction decay and spin echo) of a spin qubit interacting with a nuclear spin bath. While for infinite magnetic field B the only de…
Wavefunction considerations for the central spin decoherence problem in a nuclear spin bath
W. M. Witzel, S. Das Sarma
Decoherence of a localized electron spin in a solid state material (the ``central spin'' problem) at low temperature is believed to be dominated by interactions with nuclear spins…
Universal pulse sequence to minimize spin dephasing in the central spin decoherence problem
B. Lee, W. M. Witzel, S. Das Sarma
We present a remarkable finding that a recently discovered [G. S. Uhrig, Phys. Rev. Lett. 98, 100504 (2007)] series of pulse sequences, designed to optimally restore coherence to a…
Concatenated dynamical decoupling in a solid-state spin bath
W. M. Witzel, S. Das Sarma
Concatenated dynamical decoupling (CDD) pulse sequences hold much promise as a strategy to mitigate decoherence in quantum information processing. It is important to investigate th…
Nuclear Spins as Quantum Memory in Semiconductor Nanostructures
W. M. Witzel, S. Das Sarma
We theoretically consider solid state nuclear spins in a semiconductor nanostructure environment as long-lived, high-fidelity quantum memory. In particular, we calculate, in the li…