Adiabatic transfer of electrons in coupled quantum dots

2002/07/10 by Tobias Brandes, T. Brandes, T. Vorrath · 3 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physrevb.66.075341

published as Phys. Rev. B 66, 075341 (2002) · 13 pages, 8 figures, to appear in Phys. Rev. B

arxiv created 2002/07/10 · openalex publication_date 2002/08/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate the influence of dissipation on one- and two-qubit rotations in coupled semiconductor quantum dots, using a (pseudo-)spin-boson model with adiabatically varying parameters. For weak dissipation, we solve a master equation, compare with direct perturbation theory, and derive an expression for the ``fidelity loss'' during a simple operation that adiabatically moves an electron between two coupled dots. We discuss the possibility of visualizing coherent quantum oscillations in electron ``pump'' currents, combining quantum adiabaticity and Coulomb blockade. In two-qubit spin-swap operations where the role of intermediate charge states has been discussed recently, we apply our formalism to calculate the fidelity loss due to charge tunneling between two dots.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Resonant Photon-Assisted Tunneling through a Double Quantum Dot: An Electron Pump from Spatial Rabi Oscillations
• Quantum-state engineering with Josephson-junction devices
• Decoherence and dissipation during a quantum XOR gate operation
• Dynamics of the dissipative two-state system

Cited by

• Teleportation on a Quantum Dot Array
• Double-dot chain as a macroscopic quantum bit
• Noise Enhancement due to Quantum Coherence in Coupled Quantum Dots