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Coherent optical manipulation of ele...

Dutt, M. V. Gurudev.

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Coherent optical manipulation of electron spin in charged semiconductor quantum dots.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Coherent optical manipulation of electron spin in charged semiconductor quantum dots./
Author:	Dutt, M. V. Gurudev.
Description:	179 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5200.
Contained By:	Dissertation Abstracts International65-10B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3150194
ISBN:	0496097679

Coherent optical manipulation of electron spin in charged semiconductor quantum dots.
Dutt, M. V. Gurudev.

Coherent optical manipulation of electron spin in charged semiconductor quantum dots. - 179 p.

Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5200.

Thesis (Ph.D.)--University of Michigan, 2004.

In this work, we study the resonant nonlinear optical response obtained when optical fields are used to excite charged semiconductor quantum dots (QDs). The basic physics of charged excitons (trions) created by optical excitation of charged QDs is of interest from the point of view of optically driven spin based quantum computing (QC).

ISBN: 0496097679Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Coherent optical manipulation of electron spin in charged semiconductor quantum dots.
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020 $a 0496097679
035 $a (UnM)AAI3150194
035 $a AAI3150194
040 $a UnM $c UnM
100 1 $a Dutt, M. V. Gurudev. $3 1937744
245 1 0 $a Coherent optical manipulation of electron spin in charged semiconductor quantum dots.
300 $a 179 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5200.
500 $a Chair: Duncan G. Steel.
502 $a Thesis (Ph.D.)--University of Michigan, 2004.
520 $a In this work, we study the resonant nonlinear optical response obtained when optical fields are used to excite charged semiconductor quantum dots (QDs). The basic physics of charged excitons (trions) created by optical excitation of charged QDs is of interest from the point of view of optically driven spin based quantum computing (QC).
520 $a Stimulated Raman excitation, resonantly enhanced by the optical dipole coupling to the trion state, was used to optically generate electron spin coherence in the ground state of charged QDs. The evolution of the spin coherence was monitored through quantum beats in the phase-sensitively detected four wave mixing signal. The decay of the beats is a measure of the spin coherence time, which was found to be at least an order of magnitude greater than either the trion dipole coherence, or the Raman coherence time between excitons in a single neutral QD. A fascinating outcome of the experiment was the first observation of a contribution to the spin coherence induced by the vacuum field, which is also responsible for spontaneous emission from the trion state, known as spontaneously generated coherence (SGC).
520 $a QC demands that coherent optical manipulations should be performed within the spin coherence time. We performed coherent optical control experiments, with a pair of phase-locked pump pulses, that showed the quantum nature of the coherence through interference of different quantum mechanical pathways. We showed both in experiment and theory that we can manipulate the spin coherence on the time scale of the Larmor frequency, as well as on an ultrafast femtosecond time scale, corresponding to the optical frequency of the trion state.
520 $a Finally, resonant optical excitation of both the bright and nominally forbidden transitions from a single electron spin in a QD to the trion state were demonstrated. This allows for direct optical access to all the transitions required for optically driven QC with QD electron spins. We used frequency-domain nonlinear spectroscopy measurements on single QD trions to obtain the trion dipole decoherence and decay rates. Further, we demonstrated that the single electron spin coherence could be generated and detected optically, and found that the spin coherence time was significantly greater than in ensemble measurements at the same magnetic field.
590 $a School code: 0127.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Optics. $3 1018756
650 4 $a Physics, Atomic. $3 1029235
690 $a 0611
690 $a 0752
690 $a 0748
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 65-10B.
790 1 0 $a Steel, Duncan G., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3150194