194 citations · 917 across the 15 of their papers we have counts for
15 papers
Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
Jo-Tzu Hung, Łukasz Cywiński, Xuedong Hu +1
We investigate theoretically the hyperfine-induced dephasing of two-electron-spin states in a double quantum dot with a finite singlet-triplet splitting J. In particular, we derive…
Quantum Decoherence of the Central Spin in a Sparse System of Dipolar Coupled Spins
Wayne M. Witzel, Malcolm S. Carroll, Lukasz Cywinski +1
The central spin decoherence problem has been researched for over 50 years in the context of both nuclear magnetic resonance and electron spin resonance. Until recently, theoretica…
Master equation approach to the central spin decoherence problem: the uniform coupling model and the role of projection operators
Edwin Barnes, Łukasz Cywiński, S. Das Sarma
The generalized Master equation of the Nakajima-Zwanzig (NZ) type has been used extensively to investigate the coherence dynamics of the central spin model with the nuclear bath in…
Electron spin decoherence in isotope-enriched silicon
Wayne M. Witzel, Malcolm S. Carroll, Andrea Morello +2
Silicon is promising for spin-based quantum computation because nuclear spins, a source of magnetic noise, may be eliminated through isotopic enrichment. Long spin decoherence time…
Spin echo decay at low magnetic fields in a nuclear spin bath
L. Cywinski, V. V. Dobrovitski, S. Das Sarma
We investigate theoretically the spin echo signal of an electron localized in a quantum dot and interacting with a bath of nuclear spins. We consider the regime of very low magneti…
Quantum dot spin qubits in Silicon: Multivalley physics
Dimitrie Culcer, Lukasz Cywinski, Qiuzi Li +2
Research on Si quantum dot spin qubits is motivated by the long spin coherence times measured in Si, yet the orbital spectrum of Si dots is increased as a result of the valley degr…