109 research outputs found
Highly entangled photons from hybrid piezoelectric-semiconductor quantum dot devices
Entanglement resources are key ingredients of future quantum technologies. If
they could be efficiently integrated into a semiconductor platform a new
generation of devices could be envisioned, whose quantum-mechanical
functionalities are controlled via the mature semiconductor technology.
Epitaxial quantum dots (QDs) embedded in diodes would embody such ideal quantum
devices, but QD structural asymmetries lower dramatically the degree of
entanglement of the sources and hamper severely their real exploitation in the
foreseen applications. In this work, we overcome this hurdle using
strain-tunable optoelectronic devices, where any QD can be tuned for the
emission of highly polarization-entangled photons. The electrically-controlled
sources violate Bell inequalities without the need of spectral or temporal
filtering and they feature the highest degree of entanglement ever reported for
QDs, with concurrence as high as 0.75(2). These quantum-devices are at present
the most promising candidates for the direct implementation of QD-based
entanglement-resources in quantum information science and technology
Inversion of the exciton built-in dipole moment in In(Ga)As quantum dots via nonlinear piezoelectric effect
We show that anisotropic biaxial stress can be used to tune the built-in
dipole moment of excitons confined in In(Ga)As quantum dots up to complete
erasure of its magnitude and inversion of its sign. We demonstrate that this
phenomenon is due to piezoelectricity. We present a model to calculate the
applied stress, taking advantage of the so-called piezotronic effect, which
produces significant changes in the current-voltage characteristics of the
strained diode-membranes containing the quantum dots. Finally, self-consistent
k.p calculations reveal that the experimental findings can be only accounted
for by the nonlinear piezoelectric effect, whose importance in quantum dot
physics has been theoretically recognized although it has proven difficult to
single out experimentally.Comment: 6 pages, 4 figure
Hints for a general understanding of the epitaxial rules for van der Waals epitaxy from Ge-Sb-Te alloys
In this study, a generalized guideline is identified to predict the interaction between two-dimensional (2D) layered materials and substrate surfaces. Additionally, the van der Waals (vdW) heterostructures commensurability, the phase formation and the strain relaxation are identified during interface growth. To achieve such a general overview, the case of Ge-Sb-Te (GST) alloys on InAs(111) is studied. In this system, low-lattice mismatch conditions are fulfilled to avoid relaxation due to formation of misfit dislocations and allow to correctly identify vdW epitaxy. At the same time, the substrate can be efficiently prepared into self- and un-passivated surfaces to clarify the role of the surface interaction. Furthermore, the GST epilayer exhibits two different highly ordered 2D structures and a three-dimensional disordered structure, allowing to directly infer the nature of the epitaxy. This study opens the way for the design and mastering of vdW epitaxial growth of 2D heterostructures as well as hybrid 2D and non-layered materials
Effect of second order piezoelectricity on excitonic structure of stress-tuned InGaAs/GaAs quantum dots
We study the effects of the nonlinear piezoelectricity and the In
distribution on the exciton energy, the electron-hole electric dipole moment,
and the fine-structure splitting in stress-tunable InGaAs/GaAs quantum dots
integrated onto a piezoelectric actuator. In particular, we investigate in
detail the contributions of various elements of the expansion of the electrical
polarization in terms of externally induced elastic strain on the latter two
important quantum dot properties. Based on the comparison of the effects of
first- and second-order piezoelectricity we provide a simple relation to
estimate the influence of applied anisotropic stress on the quantum dot dipole
moment for quantum dots significantly lattice mismatched to the host crystal
Slow and fast single photons from a quantum dot interacting with the excited state hyperfine structure of the Cesium D1-line
Hybrid interfaces between distinct quantum systems play a major role in the implementation of quantum networks. Quantum states have to be stored in memories to synchronize the photon arrival times for entanglement swapping by projective measurements in quantum repeaters or for entanglement purification. Here, we analyze the distortion of a single-photon wave packet propagating through a dispersive and absorptive medium with high spectral resolution. Single photons are generated from a single In(Ga)As quantum dot with its excitonic transition precisely set relative to the Cesium D1 transition. The delay of spectral components of the single-photon wave packet with almost Fourier-limited width is investigated in detail with a 200 MHz narrow-band monolithic Fabry-PĂ©rot resonator. Reflecting the excited state hyperfine structure of Cesium, âslow lightâ and âfast lightâ behavior is observed. As a step towards room-temperature alkali vapor memories, quantum dot photons are delayed for 5 ns by strong dispersion between the two 1.17 GHz hyperfine-split excited state transitions. Based on optical pumping on the hyperfine-split ground states, we propose a simple, all-optically controllable delay for synchronization of heralded narrow-band photons in a quantum network.DFG, 43659573, SFB 787: Halbleiter - Nanophotonik: Materialien, Modelle, BauelementeEC/H2020/679183/EU/Entanglement distribution via Semiconductor-Piezoelectric Quantum-Dot Relays/SPQRe
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Modulation of van der Waals and classical epitaxy induced by strain at the Si step edges in GeSbTe alloys
The present work displays a route to design strain gradients at the interface between substrate and van der Waals bonded materials. The latter are expected to grow decoupled from the substrates and fully relaxed and thus, by definition, incompatible with conventional strain engineering. By the usage of passivated vicinal surfaces we are able to insert strain at step edges of layered chalcogenides, as demonstrated by the tilt of the epilayer in the growth direction with respect of the substrate orientation. The interplay between classical and van der Waals epitaxy can be modulated with an accurate choice of the substrate miscut. High quality crystalline GexSb2Te3+x with almost Ge1Sb2Te4 composition and improved degree of ordering of the vacancy layers is thus obtained by epitaxial growth of layers on 3â4° stepped Si substrates. These results highlight that it is possible to build and control strain in van der Waals systems, therefore opening up new prospects for the functionalization of epilayers by directly employing vicinal substrates
Atomic Clouds as Spectrally-Selective and Tunable Delay Lines for Single Photons from Quantum Dots
We demonstrate a compact, spectrally-selective, and tunable delay line for
single photons emitted by quantum dots. This is achieved by fine-tuning the
wavelength of the optical transitions of such "artificial atoms" into a
spectral window in which a cloud of natural atoms behaves as slow-light medium.
By employing the ground-state fine-structure-split exciton confined in an
InGaAs/GaAs quantum dot as a source of single photons at different frequencies
and the hyperfine-structure-split transition of Cs-vapors as a tunable
delay-medium, we achieve a differential delay of up 2.4 ns on a 7.5 cm long
path for photons that are only 60 \mu eV (14.5 GHz) apart. To quantitatively
explain the experimental data we develop a theoretical model that accounts for
both the inhomogeneously broadening of the quantum-dot emission lines and the
Doppler-broadening of the atomic lines. The concept we proposed here may be
used to implement time-reordering operations aimed at erasing the "which-path"
information that deteriorates entangled-photon emission from excitons with
finite fine-structure-splitting.Comment: 29 pages, 5 figure
Strain-tunable entangled-light-emitting diodes with high yield and fast operation speed
Triggered sources of entangled photons play crucial roles in almost any
existing protocol of quantum information science. The possibility to generate
these non-classical states of light with high speed and using electrical pulses
could revolutionize the field. Entangled-light-emitting-diodes (ELEDs) based on
semiconductor quantum dots (QDs) are at present the only devices that can
address this task 5. However, ELEDs are plagued by a source of randomness that
hampers their practical exploitation in the foreseen applications: the very low
probability (~10-2) of finding QDs with sufficiently small
fine-structure-splitting for entangled-photon-generation. Here, we overcome
this hurdle by introducing the first strain-tunable ELEDs (S-ELEDs) that
exploit piezoelectric-induced strains to tune QDs for
entangled-photon-generation. We demonstrate that up to 30% of the QDs in
S-ELEDs emit polarization-entangled photon pairs with entanglement-fidelities
as high as f+ = 0.83(5). Driven at the highest operation speed of 400 MHz ever
reported so far, S-ELEDs emerge as unique devices for high-data rate
entangled-photon applications.Comment: 28 pages in total, including supplementary information. 5 figure
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High yield and ultrafast sources of electrically triggered entangled-photon pairs based on strain-tunable quantum dots
Triggered sources of entangled photon pairs are key components in most quantum communication protocols. For practical quantum applications, electrical triggering would allow the realization of compact and deterministic sources of entangled photons. Entangled-light-emitting-diodes based on semiconductor quantum dots are among the most promising sources that can potentially address this task. However, entangled-light-emitting-diodes are plagued by a source of randomness, which results in a very low probability of finding quantum dots with sufficiently small fine structure splitting for entangled-photon generation (âŒ10â2). Here we introduce strain-tunable entangled-light-emitting-diodes that exploit piezoelectric-induced strains to tune quantum dots for entangled-photon generation. We demonstrate that up to 30% of the quantum dots in strain-tunable entangled-light-emitting-diodes emit polarization-entangled photons. An entanglement fidelity as high as 0.83 is achieved with fast temporal post selection. Driven at high speed, that is 400âMHz, strain-tunable entangled-light-emitting-diodes emerge as promising devices for high data-rate quantum applications
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