Weak measurement of quantum dot spin qubits

Jordan, Andrew N.; Trauzettel, Björn; Burkard, Guido

Weak measurement of quantum dot spin qubits

Files

0706.0180v1.pdf(223.36 KB)

Date

2007

Authors

Jordan, Andrew N.

Trauzettel, Björn

Burkard, Guido

Publication type

Journal article

Published in

Physical Review / B ; 76 (2007). - 155324

Abstract

The theory of weak quantum measurements is developed for quantum dot spin qubits. Building on recent experiments, we propose a control cycle to prepare, manipulate, weakly measure, and perform quantum state tomography. This is accomplished using a combination of the physics of electron spin resonance, spin blockade, and Coulomb blockade, resulting in a charge transport process. We investigate the influence of the surrounding nuclear spin environment, and find a regime where this environment significantly simplifies the dynamics of the weak measurement process, making this theoretical proposal realistic with existing experimental technology. We further consider spin-echo refocusing to combat dephasing, as well as discuss a realization of quantum undemolition , whereby the effects of quantum state disturbance are undone.

Subject (DDC)

530 Physics

Keywords

Coulomb blockade,Nuclear spin,Paramagnetic resonance,Quantum dots,Spin echo (EPR)

Cite This

ISO 690

JORDAN, Andrew N., Björn TRAUZETTEL, Guido BURKARD, 2007. Weak measurement of quantum dot spin qubits. In: Physical Review / B. 76, 155324. Available under: doi: 10.1103/PhysRevB.76.155324

BibTex

@article{Jordan2007measu-5042,
  year={2007},
  doi={10.1103/PhysRevB.76.155324},
  title={Weak measurement of quantum dot spin qubits},
  volume={76},
  journal={Physical Review / B},
  author={Jordan, Andrew N. and Trauzettel, Björn and Burkard, Guido},
  note={Article Number: 155324}
}

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