Dynamics of a Charge Qubit Encoded in a Double Quantum Dot

• Authors: J. Łuczak , B. Bułka
• Languages of publication: EN

Abstracts

EN

We study the short time dynamics of a charge qubit encoded in two coherently coupled quantum dots connected to external electrodes. In the regime of sequential tunneling the waiting time distribution is used to investigate in details statistics of the tunneling events and their correlations. We show that the coherent rotation of the qubit state on the Bloch sphere can be seen in tunneling events when an electron is injected and leave the system. Decoherence, relaxation of the qubit state as well as leakage processes are studied by means of transient currents.

Keywords

EN

03.67.Lx; 73.63.Kv; 73.23.Ra

Discipline

• 73.23.Ra: Persistent currents
• 73.63.Kv: Quantum dots
• 03.67.Lx: Quantum computation architectures and implementations

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 3
• Pages: 748-750

Dates

published

2018-03

Contributors

author

J. Łuczak

• Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179 Poznań, Poland

author

B. Bułka

• Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179 Poznań, Poland

References

• [1] K.D. Petersson, J.R. Petta, H. Lu, A.C. Grossard, Phys. Rev. Lett. 105, 246804 (2010), doi: 10.1103/PhysRevLett.105.246804
• [2] V. Srinivasa, J.M. Taylor, Phys. Rev. B 92, 235301 (2015), doi: 10.1103/PhysRevB.92.235301
• [3] L. Gaudreau, G. Granger, A. Kam, G.C. Aers, S.A. Studenikin, P. Zawadzki, M. Pioro-Ladriere, Z.R. Wasilewski, A.S. Sachrajda, Nature Phys. 8, 54 (2012), doi: 10.1038/nphys2149
• [4] D. Vion, A. Aassime, A. Cottet, P. Joyez, H. Pothier, C. Urbina, D. Esteve, M.H. Devoret, Science 296, 886 (2002), doi: 10.1126/science.1069372
• [5] G. Shinkai, T. Hayashi, T. Ota, T. Fujisawa, Phys. Rev. Lett. 103, 056802 (2009), doi: 10.1103/PhysRevLett.103.056802
• [6] T. Brandes, Ann. Phys. (Berlin) 17, 477 (2008), doi: 10.1002/andp.200810306
• [7] M. Busl, G. Platero, Phys. Rev. B 82, 205304 (2010), doi: 10.1103/PhysRevB.82.205304

Identifiers

DOI

10.12693/APhysPolA.133.748