Coherent Optical Control of the Spin of a Single Hole in an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>InAs</mml:mi><mml:mo>/</mml:mo><mml:mi>GaAs</mml:mi></mml:math>Quantum Dot

Godden, T. M.; Quilter, J. H.; Ramsay, Andrew J.; Wu, Yanwen; Brereton, Peter; Boyle, S. J.; Luxmoore, I. J.; Puebla, Jorge; Fox, A. M.; Skolnick, M. S.

doi:10.1103/physrevlett.108.017402

Cited by 101 publications

(121 citation statements)

References 25 publications

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“…2c and d, makes it possible to develop new, original approaches to coherent electron and hole spin control. [28][29][30] The main part of this paper, Sec. III B, is devoted to a detailed microscopic model that provides quantitative evaluation of the magnetic field induced heavy-hole mixing in the Faraday geometry.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Durnev¹,

Glazov²,

Ivchenko³

et al. 2013

Phys. Rev. B

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We present a microscopic theory of the magnetic field induced mixing of heavy-hole states ±3/2 in GaAs droplet dots grown on (111)A substrates. The proposed theoretical model takes into account the striking dot shape with trigonal symmetry revealed in atomic force microscopy. Our calculations of the hole states are carried out within the Luttinger Hamiltonian formalism, supplemented with allowance for the triangularity of the confining potential. They are in quantitative agreement with the experimentally observed polarization selection rules, emission line intensities and energy splittings in both longitudinal and transverse magnetic fields for neutral and charged excitons in all measured single dots.

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Section: Introductionmentioning

confidence: 99%

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Durnev¹,

Glazov²,

Ivchenko³

et al. 2013

Phys. Rev. B

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“…The approach presented here builds on experimental progress in the coherent control of single hole spins 16,17,[22][23][24][25][26][27] and electron spins in QDMs. 9 The new design combines advantages of these approaches and makes several key improvements that significantly enhance scalability.…”

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confidence: 99%

Scalable qubit architecture based on holes in quantum dot molecules

et al. 2012

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Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently controlled by optical pulses. There are, however, many challenges to developing a scalable multibit information processing device based on spins in quantum dots, including the natural inhomogeneous distribution of quantum dot energy levels, the difficulty of creating all-optical spin manipulation protocols compatible with nondestructive readout, and the substantial electron-nuclear hyperfine interaction-induced decoherence. Here, we present a scalable qubit design and device architecture based on the spin states of single holes confined in a quantum dot molecule. The quantum dot molecule qubit enables a new strategy for optical coherent control with dramatically enhanced wavelength tunability. The use of hole spins allows the suppression of decoherence via hyperfine interactions and enables coherent spin rotations using Raman transitions mediated by a hole-spin-mixed optically excited state. Because the spin mixing is present only in the optically excited state, dephasing and decoherence are strongly suppressed in the ground states that define the qubits and nondestructive readout is possible. We present the qubit and device designs and analyze the wavelength tunability and fidelity of gate operations that can be implemented using this strategy. We then present experimental and theoretical progress toward implementing this design.Comment: 13 pages, 9 figure

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“…[3,4] Additionally, the p-type symmetry of the valence band orbitals causes a weak hyperfine interaction with the lattice nuclei, thus giving rise to decoherence times potentially longer than those of electron spins. [5,6,7,8,9,10,11] This has enabled successful hole spin initialization [12] and coherent control [10,13]. Double quantum dots (DQDs) are a natural extension which should facilitate the use of independent optical transitions for spin preparation, manipulation and readout, [14] as well as the scalability towards multiple qubit architectures.…”

Section: Introductionmentioning

confidence: 99%

Hole spin relaxation in InAs/GaAs quantum dot molecules

Segarra

Climente

Rajadell

et al. 2015

J. Phys.: Condens. Matter

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Abstract. We calculate the spin-orbit induced hole spin relaxation between Zeeman sublevels of vertically stacked InAs quantum dots. The widely used Luttinger-Kohn Hamiltonian, which considers coupling of heavy-and light-holes, reveals that hole spin lifetimes (T 1 ) of molecular states significantly exceed those of single quantum dot states. However, this effect can be overcome when cubic Dresselhaus spin-orbit interaction is strong. Misalignment of the dots along the stacking direction is also found to be an important source of spin relaxation.

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Coherent Optical Control of the Spin of a Single Hole in anInAs/GaAsQuantum Dot

Cited by 101 publications

References 25 publications

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Scalable qubit architecture based on holes in quantum dot molecules

Hole spin relaxation in InAs/GaAs quantum dot molecules

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