Decoherence of coupled electron spins via nuclear spin dynamics in quantum dots

2007/07/17 by Wen Yang, W. Yang, Ren‐Bao Liu +1
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum optics and atomic interactions #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.77.085302

published as PHYSICAL REVIEW B 77, 085302 (2008) · 4 pages 3 figures

arxiv created 2007/07/17 · openalex publication_date 2008/02/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In double quantum dots, the exchange interaction between two electron spins renormalizes the excitation energy of pair flips in the nuclear spin bath, which in turn modifies the non-Markovian bath dynamics. As the energy renormalization varies with the static Overhauser field mismatch between the quantum dots, the electron singlet-triplet decoherence resulting from the bath dynamics depends on sampling of nuclear spin states from an ensemble, leading to the transition from superexponential decoherence in single-sample dynamics to power-law decay under ensemble averaging. In contrast, the decoherence of a single electron spin in one dot is essentially the same for different choices of the nuclear spin configuration.

Citations

• Restoring Coherence Lost to a Slow Interacting Mesoscopic Spin Bath
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Universal Phase Shift and Nonexponential Decay of Driven Single-Spin Oscillations
• Universal scaling of hyperfine-induced electron spin echo decay
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Decoherence, einselection, and the quantum origins of the classical
• Single-shot read-out of an individual electron spin in a quantum dot