Research PapersNo Access

OPTICAL PHONON EFFECT IN AN ASYMMETRIC QUANTUM DOT QUBIT

ZHAO-HUA DING

College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China

Search for more papers by this author

YONG SUN

College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China

Search for more papers by this author

, and

JING-LIN XIAO

College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China

Corresponding author.

Search for more papers by this author

https://doi.org/10.1142/S0219749912500773Cited by:31 (Source: Crossref)

Abstract

We investigate the eigenenergies and the eigenfunctions of the ground and the first excited states of an electron, which is strongly coupled to LO-phonon in an asymmetric quantum dot (QD) by using variational method of Pekar type. The present system may be used as a two-level qubit. When the electron is in the superposition state of the ground and the first excited states, the probability density of the electron oscillates in the QD with a certain period. It is found that the oscillation period is an increasing function of the transverse and the longitudinal effective confinement lengths of the QD, whereas it is a decreasing one of the electron–phonon coupling strength.

Keywords:

PACS: 71.38.-k, 63.20.kd, 63.22.-m

References

M. A. Nielsen and I. L. Chang , Quantum Computation and Quantum Information ( Cambridge University Press , Cambridge , 2000 ) . Google Scholar
I. D'Amico , Microelectron. J. 37 , 1440 ( 2006 ) . Crossref, Web of Science, Google Scholar
C. H. Bennett and D. P. DiVincenzo , Nature 404 , 247 ( 2000 ) . Crossref, Web of Science, Google Scholar
P. Hawrylak and M. Korkusinski , Solid State Commun. 136 , 508 ( 2005 ) . Crossref, Web of Science, Google Scholar
S. D. Sarma et al. , Solid State Commun. 133 , 737 ( 2005 ) . Crossref, Web of Science, Google Scholar
G. P. Berman , G. D. Doolen and V. I. Tsifrinovich , Superlatt. Microstruct. 27 , 89 ( 2000 ) . Crossref, Web of Science, Google Scholar
A. Barenco et al. , Phys. Rev. Lett. 74 , 4803 ( 1995 ) . Crossref, Web of Science, Google Scholar
S. S. Li et al. , J. Appl. Phys. 90 , 6151 ( 2001 ) . Crossref, Web of Science, Google Scholar
S. S. Li et al. , Proc. Natl. Acad. Sci. USA 98 , 11847 ( 2001 ) . Crossref, Web of Science, Google Scholar
J. K. Sun , H. J. Li and J. L. Xiao , Physica B 404 , 1961 ( 2009 ) . Crossref, Web of Science, Google Scholar
W. P. Li et al. , J. Low Temp. Phys. 160 , 112 ( 2010 ) . Crossref, Web of Science, Google Scholar
J. W. Yin et al. , Chin. Phys. B 18 , 446 ( 2009 ) . Crossref, Web of Science, Google Scholar
Z. W. Wang and J. L. Xiao , Acta. Phys. Sin. 56 , 678 ( 2007 ) . Crossref, Web of Science, Google Scholar
Z. W. Wang et al. , Commun. Theor. Phys 49 , 311 ( 2008 ) . Crossref, Web of Science, Google Scholar