Feedback stabilization of pure states in quantum transport

2011/03/31 by Christina Pöltl, Clive Emary, Tobias Brandes
Computer Science · Physics and Astronomy · #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.84.085302

published as Phys. Rev. B 84, 085302 (2011) · 7 pages, 5 figures

openalex publication_date 2011/08/19 · arxiv created 2011/08/22 · arxiv updated 2011/08/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We propose a feedback control scheme for generating and stabilizing pure states of transport devices, such as charge qubits, under nonequilibrium conditions. The purification of the device state is conditioned on single electron jumps and leaves a clear signal in the full counting statistics which can be used to optimize control parameters. As an example of our control scheme, we are presenting the stabilization of pure transport states in a double-quantum-dot setup with the inclusion of phonon dephasing.

Citations

• Electron counting statistics and coherent states of electric current
• Coherent and collective quantum optical effects in mesoscopic systems
• High-fidelity measurement and quantum feedback control in circuit QED
• Adiabatic transfer of electrons in coupled quantum dots