Relaxation, dephasing, and quantum control of electron spins in double quantum dots

By Jacob M. Taylor, Jason R. Petta, A. Johnson, A. Yacoby, Charles M. Marcus, Mikhail D. Lukin. 2006

263 citations recorded by the source corpus.

Recent experiments have demonstrated quantum manipulation of two-electron spin states in double quantum dots using electrically controlled exchange interactions. Here we present a detailed theory for electron-spin dynamics in two-electron double-dot systems that was used to guide those experiments and analyze the results. Specifically, we analyze both spin- and charge-relaxation and dephasing mechanisms that are relevant to experiments and discuss practical approaches for quantum control of two-electron systems. We show that both charge and spin dephasing play important roles in the dynamics of the two-spin system, but neither represents a fundamental limit for electrical control of spin degrees of freedom in semiconductor quantum bits.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/8d4d621f6cbd61a2889b2017452175b443a93b1a

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In Atomic and Molecular Physics, and Optics

1. Franco Nori
2. Sahel Ashhab
3. J. You
4. Z. Xiang
5. I. Carusotto
6. A. Imamoğlu
7. Antonio Badolato
8. A. Högele

In Electrical and Electronic Engineering

1. Sahel Ashhab
2. I. Carusotto
3. A. Imamoğlu
4. Franco Nori

Citations in the corpus

• Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “Furthermore, rapid progress has been made with quantum dots (Loss and DiVincenzo, 1998; Taylor et al., 2007), which can be fabricated on a chip and controlled relatively easily using electric signals.”
• Confluence of resonant laser excitation and bidirectional quantum-dot nuclear-spin polarization (2009, background): “Suppression of the long-timescale Overhauser field fluctuations by laser dragging may be used to ensure that the time/ensemble averaged spin coherence measurements yield a dephasing time that is limited only by the fundamental spin decoherence processes [24, 25, 26].”
• Coherent control of three-spin states in a triple quantum dot (2011, background): “The hyperfine interaction [16] couples the state ∆1/2 to the state Q3/2 (Q1/2) at their anticrossing (asymptotic approach), see Fig.”