Detector backaction on the self-consistent bound state in quantum point contacts

2008/09/10 by Y. Yoon, Min-Sung Kang, M. -G. Kang +11
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.79.121304

arxiv created 2008/09/10 · openalex publication_date 2009/03/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Bound-state (BS) formation in quantum point contacts (QPCs) may offer a convenient way to localize and probe single spins. In this Rapid Communication, we investigate how such BSs are affected by monitoring them with a second QPC, which is coupled to the BS via wave-function overlap. We show that this coupling leads to a unique detector backaction, in which the BS is weakened by increasing its proximity to the detector. We also show, however, that this interaction between the QPCs can be regulated at will by using an additional gate to control their wave-function overlap.

Citations

• Detection of Local-Moment Formation Using the Resonant Interaction between Coupled Quantum Wires
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot
• Single-shot read-out of an individual electron spin in a quantum dot
• Effects of Configuration Interaction on Intensities and Phase Shifts