Voltage-Controlled Berry Phases in Two Coupled Quantum Dots

Abstract

The voltage-controlled Berry phases in two vertically coupled InGaAs/GaAs quantum dots are investigated theoretically. It is found that Berry phases can be changed dramatically from 0 to 2$\pi$ (or 2$\pi$ to 0) only simply by turning the external voltage. Under realistic conditions, as the tunneling is varied from $0.8eV$ to $0.9eV$ via a bias voltage, the Berry phases are altered obviously, which can be detected in an interference experiment. The scheme is expected to be useful in constructing quantum computation based on geometric phases in an asymmetrical double quantum dot controlled by voltage.

10 pages, 3 figures

References in corpus (5)

• Observation of Berry's Phase in a Solid State Qubit
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Frequency-selective single photon detection using a double quantum dot
• Recent advances in exciton based quantum information processing in quantum dot nanostructures
• Coherent control of a flux qubit by phase-shifted resonant microwave pulses