Dependence of the Redshifted and Blueshifted Photoluminescence Spectra of Single<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>In</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ga</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi>As</mml:mi><mml:mo>/</mml:mo><mml:mi>GaAs</mml:mi></mml:math>Quantum Dots on the Applied Uniaxial Stress

Jöns, Klaus D.; Hafenbrak, R.; Singh, Ranber; Ding, Fei; Plumhof, J. D.; Rastelli, Armando; Schmidt, Oliver G.; Bester, Gabriel; Michler, Peter

doi:10.1103/physrevlett.107.217402

Cited by 47 publications

(54 citation statements)

References 23 publications

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“…However, because the neutral, charged, and bi-exciton lines all experience nearly identical behavior under strain [151,159], the exact nature of the exciton emission does not affect our results.…”

Section: Qed Systemmentioning

confidence: 45%

“…Methods to improve strain transfer into the sample such as using a stiffer bracket and a smaller piece of substrate may also improve tuning range. Finally, it is also possible to use a different type of quantum dots that are more sensitive to strain [159,162]. The current device implementation can be adapted to apply strain locally to individual cavities using micro-fabricated piezoelectric micro-electro-mechanical structures.…”

Section: Discussionmentioning

confidence: 99%

“…Strain tuning is an alternate method for tuning quantum dots [149][150][151][152][153][154][155][156][157][158][159][160]. In this method strain modifies the confinement of electrons and holes, thereby changing their Coulomb interaction strength [151].…”

Section: Qed Systemmentioning

confidence: 99%

See 2 more Smart Citations

Nanophotonic Quantum Interface for a Single Solid-state Spin

Sun

Kim

Solomon

et al. 2016

Conference on Lasers and Electro-Optics

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The ability to store and transmit quantum information plays a central role in virtually all quantum information processing applications. Single spins serve as pristine quantum memories whereas photons are ideal carriers of quantum information. Strong interactions between these two systems provide the necessary interface for developing future quantum networks and distributed quantum computers.They also enable a broad range of critical quantum information functionalities such as entanglement distribution, non-destructive quantum measurements and strong photon-photon interactions. Realizing spin-photon interactions in a solid-state device is particularly desirable because it opens up the possibility of chip-integrated quantum circuits that support gigahertz bandwidth operation.In this thesis, I demonstrate a nanophotonic quantum interface between a single solid-state spin and a photon, and explore its applications in quantum information processing. First, we experimentally realize a spin-photon quantum phase switch based on a strongly coupled quantum dot and photonic crystal cavity system. This device enables coherent light-matter interactions at the fundamental limit, where a single spin controls the polarization of a photon and a single photon flips the spin state. Furthermore, we theoretically propose a way to deterministically generate spin-photon entanglement based on the spin-photon quantum interface, which is an important step towards solid-state implementations of quantum repeaters and quantum networks. Next, we show both theoretically and experimentally, a new method to optically read out a solid-state spin based on the same cavity quantum electrodynamics (QED) system. This new method achieves significant improvement in spin readout fidelity over typical approaches using fluorescence light detection.In the end, we report efforts to realize tunable and robust quantum dot based cavity QED systems. We present a technique for tuning the frequency of a quantum dot that is strongly coupled to a photonic crystal cavity by applying strain. This tuning technique enables us to accurately control the detuning between a quantum dot and a cavity without affecting other emission properties of the dot, which is essential for lots of applications associated with cavity QED systems, including non-classical light generation, photon blockade, single photon level optical switch, and also our major focus, the spin-photon quantum interface.

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Section: Qed Systemmentioning

confidence: 45%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Nanophotonic Quantum Interface for a Single Solid-state Spin

Sun

Kim

Solomon

et al. 2016

Conference on Lasers and Electro-Optics

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“…Great efforts have been made trying to eliminate the FSS of excitons in QDs, and significant progress has been made in understanding [13][14][15][16] and manipulating the FSS in selfassembled QDs in recent years. Various techniques has been developed to eliminate the FSS in QDs [4,[17][18][19][20][21][22][23]. Especially, it was recently found by applying combined uniaxial stresses or stress together with electric field, it is possible to reduce to the FSS to nearly zero for general self-assembled InAs/GaAs QDs [5,23,24].…”

mentioning

confidence: 99%

Towards Scalable Entangled Photon Sources with Self-AssembledInAs/GaAsQuantum Dots

et al. 2015

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Biexciton cascade process in self-assembled quantum dots (QDs) provides an ideal system for deterministic entangled photon pair source [1,2], which is essential in quantum information science. The entangled photon pairs have recently be realized in experiments [3][4][5] after eliminating the FSS of exciton using a number of different methods. However, so far the QDs entangled photon sources are not scalable, because the wavelengths of the QDs are different from dot to dot. Here we propose a wavelength tunable entangled photon emitter on a three dimensional stressor, in which the FSS and exciton energy can be tuned independently, allowing photon entanglement between dissimilar QDs. We confirm these results by using atomistic pseudopotential calculations. This provides a first step towards future realization of scalable entangled photon generators for quantum information applications.Entangled photon pairs play a crucial role in quantum information applications, including quantum teleportation [6], quantum cryptography [7] and distributed quantum computation [8], etc. The biexciton cascade process in a self-assembled QD has been proposed [1] to generate the "event-ready" entangled photon pairs. As shown in Fig. 1(a), a biexciton decays into two photons via two paths of different polarizations |H and |V . If the two paths are indistinguishable, the final result is a polarization entangled photon pair state [1,3]However, the |H -and |V -polarized photons have a small energy difference, known as the fine structure splitting (FSS), which is typically about -40 ∼ +80 µeV in the InAs/GaAs QDs [9][10][11], much larger than the radiative linewidth (∼ 1.0 µeV) [3,12]. Such a splitting provides therefore "which way" information about the photon decay path that can destroy the photon entanglement, leaving only classically correlated photon pairs [3,12]. Great efforts have been made trying to eliminate the FSS of excitons in QDs, and significant progress has been made in understanding [13][14][15][16] and manipulating the FSS in selfassembled QDs in recent years. Various techniques has been developed to eliminate the FSS in QDs [4,[17][18][19][20][21][22][23]. Especially, it was recently found by applying combined uniaxial stresses or stress together with electric field, it is possible to reduce to the FSS to nearly zero for general self-assembled InAs/GaAs QDs [5,23,24]. However, to build practical QDs devices for applications in quantum information science, they must be scalable. One possible application for scalable entangled photon emitters is shown in Fig. 1(b) as quantum repeater to distribute entanglement over long distance. The set-up of Fig. 1(b) can also be used to generate multi-photon entanglement [25,26]. The on-demand entangled photon emitters have great advantages of over the traditional parametric down convention process to generate multi-photon entanglement, which has finite probability of generating more than one photon pair in a excitation cycle [7]. In these applications, the wavelengths of the joint photo...

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“…8 Therefore, the photon entanglement is destroyed. 3,9 Different tuning techniques to erase the FSS, such as thermal annealing, 10 applying electric fields, [11][12][13] magnetic fields, 14 and strain fields [15][16][17][18][19][20][21][22] have been explored. Recently, a new method of using a microstructured semiconductor-piezoelectric device to build scalable entangled photon sources with self-assembled QDs was proposed, 23,24 and was successfully demonstrated by combined uniaxial stresses along two orthogonal directions, i.e., along [110] and [1-10] crystal axis of GaAs.…”

mentioning

confidence: 99%

Tuning exciton energy and fine-structure splitting in single InAs quantum dots by applying uniaxial stress

Dou

et al. 2016

AIP Advances

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Exciton and biexciton emission energies as well as excitonic fine-structure splitting (FSS) in single InAs/GaAs quantum dots (QDs) have been continuously tuned in situ in an optical cryostat using a developed uniaxial stress device. With increasing tensile stress, the red shift of excitonic emission is up to 5 nm; FSS decreases firstly and then increases monotonically, reaching a minimum value of approximately 10 μeV; biexciton binding energy decreases from 460 to 106 μeV. This technique provides a simple and convenient means to tune QD structural symmetry, exciton energy and biexciton binding energy and can be used for generating entangled and indistinguishable photons.

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Dependence of the Redshifted and Blueshifted Photoluminescence Spectra of SingleInxGa1−xAs/GaAsQuantum Dots on the Applied Uniaxial Stress

Cited by 47 publications

References 23 publications

Nanophotonic Quantum Interface for a Single Solid-state Spin

Nanophotonic Quantum Interface for a Single Solid-state Spin

Towards Scalable Entangled Photon Sources with Self-AssembledInAs/GaAsQuantum Dots

Tuning exciton energy and fine-structure splitting in single InAs quantum dots by applying uniaxial stress

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