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Collecting single photons from a cavity-coupled quantum dot using an adiabatic tapered fiber
Anatole Bach, Antoine Chapuis, Corentin Morin, Richard Hostein, Savvas Germanis, Benoit Eble, Mathieu Bernard, Florent Margaillan, Paola Atkinson, Valia Voliotis, Remy Braive, Kimon Moratis
Oct 15 2024 physics.optics cond-mat.mtrl-sci arXiv:2410.09832v1

@misc{2410.09832, author = {Anatole Bach and Antoine Chapuis and Corentin Morin and Richard Hostein and Savvas Germanis and Benoit Eble and Mathieu Bernard and Florent Margaillan and Paola Atkinson and Valia Voliotis and Remy Braive and Kimon Moratis}, title = {{C}ollecting single photons from a cavity-coupled quantum dot using an adiabatic tapered fiber}, year = {2024}, eprint = {2410.09832}, note = {arXiv:2410.09832v1} }
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We demonstrate efficient in-plane optical fiber collection of single photon emission from quantum dots embedded in photonic crystal cavities. This was achieved via adiabatic coupling between a tapered optical fiber and a tapered on-chip photonic waveguide coupled to the photonic crystal cavity. The collection efficiency of a dot in a photonic crystal cavity was measured to be 5 times greater via the tapered optical fiber compared to collection by a microscope objective lens above the cavity. The single photon source was also characterized by second order photon correlations measurements giving g(2)(0)=0.17 under non-resonant excitation. Numerical calculations demonstrate that the collection efficiency could be further increased by improving the dot-cavity coupling and by increasing the overlap length of the tapered fiber with the on-chip waveguide. An adiabatic coupling of near unity is predicted for an overlap length of 5 microns.
First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors
ALICE ITS project, G. Aglieri Rinella, M. Agnello, B. Alessandro, F. Agnese, R.S. Akram, J. Alme, E. Anderssen, D. Andreou, F. Antinori, N. Apadula, P. Atkinson, R. Baccomi, A. Badalà, A. Balbino, C. Bartels, R. Barthel, F. Baruffaldi, I. Belikov, S. Beole, et al (234)
May 28 2021 physics.ins-det arXiv:2105.13000v2

@misc{2105.13000, author = {ALICE ITS project and G.~Aglieri Rinella and M.~Agnello and B.~Alessandro and F.~Agnese and R.S.~Akram and J.~Alme and E.~Anderssen and D.~Andreou and F.~Antinori and N.~Apadula and P.~Atkinson and R.~Baccomi and A.~Badalà and A.~Balbino and C.~Bartels and R.~Barthel and F.~Baruffaldi and I.~Belikov and S.~Beole and P.~Becht and A.~Bhatti and M.~Bhopal and N.~Bianchi and M.B.~Blidaru and G.~Boca and J.~Bok and G.~Bonomi and M.~Bonora and M.~Borri and V.~Borshchov and E.~Botta and G.E.~Bruno and M.~Buckland and S.~Bufalino and M.~Cai and P.~Camerini and P.~Cariola and F.~Catalano and C.~Ceballos Sanchez and I.~Chakaberia and M.~Chartier and F.~Colamaria and D.~Colella and A.~Collu and M.~Concas and G.~Contin and S.~Costanza and P.~Cui and A.~Dainese and J.B.~Dainton and L.~De Cilladi and C.~De Martin and G.~De Robertis and W.~Deng and A.~Di Mauro and Y.~Ding and M.~Durkac and D.~Elia and M.R.~Ersdal and M.~Faggin and F.~Fan and A.~Fantoni and P.~Fecchio and A.~Feliciello and G.~Feofilov and A.~Ferk and J.~Ferencei and G.~Fiorenza and A.N.~Flores and E.~Fragiacomo and D.~Gajanana and A.~Gal and C.~Gao and C.~Gargiulo and P.~Gianotti and P.~Giubilato and A.~Grant and L.~Greiner and A.~Grelli and O.S.~Groettvik and F.~Grosa and C.~Guo Hu and R.~Hannigan and J.A.~Hasenbichler and H.~Helstrup and H.~Hillemanns and C.~Hills and P.~Hindley and B.~Hippolyte and B.~Hofman and G.H.~Hong and G.~Huang and J.P.~Iddon and H.~Ilyas and M.A.~Imhoff and A.~Isakov and A.~Jadlovska and S.~Jadlovska and J.~Jadlovsky and S.~Jaelani and T.~Johnson and A.~Junique and P.~Kalinak and A.~Kalweit and M.~Keil and Z.~Khabanova and H.~Khan and B.~Kim and C.~Kim and J.~Kim and J.~Kim and T.~Kim and J.~Klein and A.~Kluge and C.~Kobdaj and A.~Kotliarov and I.~Králik and F.~Krizek and T.~Kugathasan and C.~Kuhn and P.G.~Kuijer and S.~Kushpil and M.J.~Kweon and J.Y.~Kwon and Y.~Kwon and P.~La Rocca and A.~Lakrathok and R.~Langoy and P.~Larionov and E.~Laudi and T.~Lazareva and R.~Lea and R.C.~Lemmon and X.L.~Li and J.~Lien and B.~Lim and S.H.~Lim and S.~Lindsay and A.~Liu and J.~Liu and J.~Liu and M.~Lunardon and G.~Luparello and M.~Lupi and M.~Mager and A.~Maire and Q.W.~Malik and G.~Mandaglio and V.~Manzari and Y.~Mao and G.V.~Margagliotti and C.~Markert and D.~Marras and P.~Martinengo and S.~Masciocchi and M.~Masera and A.~Masoni and A.~Mastroserio and P.F.T.~Matuoka and G.~Mazza and F.~Mazzaschi and M.A.~Mazzoni and F Morel and V.~Muccifora and A.~Mulliri and L.~Musa and S.V.~Nesbo and D.~Nesterov and J.~Norman and J.~Park and R.N Patra and C.~Pastore and H.~Pei and X.~Peng and S.~Piano and C.~Pinto and S.~Pisano and S.~Politano and E.~Prakasa and F.~Prino and M.~Protsenko and M.~Puccio and A.~Rachevski and L.~Ramello and F.~Rami and I.~Ravasenga and A.~Rehman and F.~Reidt and F.~Riggi and K.~Røed and D.~Röhrich and F.~Ronchetti and A.~Rosano and M.J.~Rossewij and A.~Rossi and R.~Rui and R.~Russo and R.~Sadikin and V.~Sarritzu and J.~Schambach and S.~Senyukov and J.J.~Seo and R.~Shahoyan and S.~Shaukat and S.~Siddhanta and M.~Sitta and R.J.M.~Snellings and W.~Snoeys and A.~Songmoolnak and J.~Sonneveld and F.~Soramel and M.~Suljic and S.~Sumowidagdo and D.~Sun and X.~Sun and G.J.~Tambave and G.~Tersimonov and M.~Tkacik and M.~Toppi and A.~Trifiró and S.~Trogolo and V.~Trubnikov and R.~Turrisi and T.S.~Tveter and I.~Tymchuck and K.~Ullaland and M.~Urioni and G.L.~Usai and N.~Valle and L.V.R.~van Doremalen and T.~Vanat and J.W.~Van Hoorne and M.~Varga-Kofarago and A.~Velure and D.~Wang and Y.~Wang and J.~Wikne and J.R.~Wright and R.~Xu and P.~Yang and Z.~Yin and I.-K.~Yoo and J.H.~Yoon and S.~Yuan and V.~Zaccolo and E.~Zhang and X.~Zhang and V.~Zherebchevskii and D.~Zhou and J.~Zhu and Y.~Zhu and G.~Zinovjev and N.~Zurlo}, title = {{F}irst demonstration of in-beam performance of bent {M}onolithic {A}ctive {P}ixel {S}ensors}, year = {2021}, eprint = {2105.13000}, note = {arXiv:2105.13000v2} }
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A novel approach for designing the next generation of vertex detectors foresees to employ wafer-scale sensors that can be bent to truly cylindrical geometries after thinning them to thicknesses of 20-40$\mu$m. To solidify this concept, the feasibility of operating bent MAPS was demonstrated using 1.5$\times$3cm ALPIDE chips. Already with their thickness of 50$\mu$m, they can be successfully bent to radii of about 2cm without any signs of mechanical or electrical damage. During a subsequent characterisation using a 5.4GeV electron beam, it was further confirmed that they preserve their full electrical functionality as well as particle detection performance. In this article, the bending procedure and the setup used for characterisation are detailed. Furthermore, the analysis of the beam test, including the measurement of the detection efficiency as a function of beam position and local inclination angle, is discussed. The results show that the sensors maintain their excellent performance after bending to radii of 2cm, with detection efficiencies above 99.9% at typical operating conditions, paving the way towards a new class of detectors with unprecedented low material budget and ideal geometrical properties.
Hyperfine constants and line separations for the $^{1}S_{0}-\,^{3}P_{1}$ intercombination line in neutral ytterbium with sub-Doppler resolution
Peggy E. Atkinson, Jesse S. Schelfhout, John J. McFerran
Aug 12 2019 physics.atom-ph arXiv:1908.03350v1

@misc{1908.03350, author = {Peggy E.~Atkinson and Jesse S.~Schelfhout and John J.~McFerran}, title = {{H}yperfine constants and line separations for the $^{1}{S}_{0}-\,^{3}{P}_{1}$ intercombination line in neutral ytterbium with sub-{D}oppler resolution}, year = {2019}, eprint = {1908.03350}, note = {arXiv:1908.03350v1} }
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Optical frequency measurements of the intercombination line $(6s^{2})\,^{1}S_{0} -(6s6p)\,^{3}P_{1}$ in the isotopes of ytterbium are carried out with the use of sub-Doppler fluorescence spectroscopy on an atomic beam. A dispersive signal is generated to which a master laser is locked, while frequency counting of an auxiliary beat signal is performed via a frequency comb referenced to a hydrogen maser. The relative separations between the lines are used to evaluate the $^{3}P_{1}$-level magnetic dipole and electric quadrupole constants for the fermionic isotopes. The center of gravity for the $^3P_1$ levels in $^{171}$Yb and $^{173}$Yb are also evaluated, where we find significant disagreement with previously reported values. These hyperfine constants provide a valuable litmus test for atomic many-body computations in ytterbium.
Coupling a single solid state quantum emitter to an array of resonant plasmonic antennas
Markus Pfeiffer, Paola Atkinson, Armando Rastelli, Oliver G. Schmidt, Harald Giessen, Markus Lippitz, Klas Lindfors
Jan 11 2018 physics.optics arXiv:1801.03448v1

@misc{1801.03448, author = {Markus Pfeiffer and Paola Atkinson and Armando Rastelli and Oliver G.~Schmidt and Harald Giessen and Markus Lippitz and Klas Lindfors}, title = {{C}oupling a single solid state quantum emitter to an array of resonant plasmonic antennas}, year = {2018}, eprint = {1801.03448}, note = {arXiv:1801.03448v1} }
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Plasmon resonant arrays or meta-surfaces shape both the incoming optical field and the local density of states for emission processes. They provide large regions of enhanced emission from emitters and greater design flexibility than single nanoantennas. This makes them of great interest for engineering optical absorption and emission. Here we study the coupling of a single quantum emitter, a self-assembled semiconductor quantum dot, to a plasmonic meta-surface. We investigate the influence of the spectral properties of the nanoantennas and the position of the emitter in the unit cell of the structure. We observe a resonant enhancement due to emitter-array coupling in the far-field regime and find a clear difference from the interaction of an emitter with a single antenna.
Multiharmonic frequency-chirped transducers for surface-acoustic-wave optomechanics
Matthias Weiß, Andreas L. Hörner, Eugenio Zallo, Paola Atkinson, Armando Rastelli, Oliver G. Schmidt, Achim Wixforth, Hubert J. Krenner
Aug 02 2017 physics.app-ph cond-mat.mes-hall physics.optics arXiv:1708.00261v2

@misc{1708.00261, author = {Matthias Weiß and Andreas L.~Hörner and Eugenio Zallo and Paola Atkinson and Armando Rastelli and Oliver G.~Schmidt and Achim Wixforth and Hubert J.~Krenner}, title = {{M}ultiharmonic frequency-chirped transducers for surface-acoustic-wave optomechanics}, year = {2017}, eprint = {1708.00261}, note = {arXiv:1708.00261v2} }
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Wide passband interdigital transducers are employed to establish a stable phase-lock between a train of laser pulses emitted by a mode-locked laser and a surface acoustic wave generated electrically by the transducer. The transducer design is based on a multi-harmonic split-finger architecture for the excitation of a fundamental surface acoustic wave and a discrete number of its overtones. Simply by introducing a variation of the transducer's periodicity $p$, a frequency chirp is added. This combination results in wide frequency bands for each harmonic. The transducer's conversion efficiency from the electrical to the acoustic domain was characterized optomechanically using single quantum dots acting as nanoscale pressure sensors. The ability to generate surface acoustic waves over a wide band of frequencies enables advanced acousto-optic spectroscopy using mode-locked lasers with fixed repetition rate. Stable phase-locking between the electrically generated acoustic wave and the train of laser pulses was confirmed by performing stroboscopic spectroscopy on a single quantum dot at a frequency of 320 MHz. Finally, the dynamic spectral modulation of the quantum dot was directly monitored in the time domain combining stable phase-locked optical excitation and time-correlated single photon counting. The demonstrated scheme will be particularly useful for the experimental implementation of surface acoustic wave-driven quantum gates of optically addressable qubits or collective quantum states or for multi-component Fourier synthesis of tailored nanomechanical waveforms.
Asteroid Impact Effects And Their Immediate Hazards For Human Populations
Clemens M. Rumpf, Hugh G. Lewis, Peter M. Atkinson
Mar 23 2017 physics.space-ph physics.geo-ph arXiv:1703.07592v3

@misc{1703.07592, author = {Clemens M.~Rumpf and Hugh G.~Lewis and Peter M.~Atkinson}, title = {{A}steroid {I}mpact {E}ffects {A}nd {T}heir {I}mmediate {H}azards {F}or {H}uman {P}opulations}, year = {2017}, eprint = {1703.07592}, doi = {10.1002/2017GL073191}, note = {arXiv:1703.07592v3} }
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A set of 50,000 artificial Earth impacting asteroids was used to obtain, for the first time, information about the dominance of individual impact effects such as wind blast, overpressure shock, thermal radiation, cratering, seismic shaking, ejecta deposition and tsunami for the loss of human life during an impact event for impactor sizes between 15 to 400 m and how the dominance of impact effects changes over size. Information about the dominance of each impact effect can enable disaster managers to plan for the most relevant effects in the event of an asteroid impact. Furthermore, the analysis of average casualty numbers per impactor shows that there is a significant difference in expected loss for airburst and surface impacts and that the average impact over land is an order of magnitude more dangerous than one over water.
Population Vulnerability Models for Asteroid Impact Risk Assessment
Clemens M. Rumpf, Hugh G. Lewis, Peter M. Atkinson
Feb 21 2017 physics.space-ph physics.geo-ph arXiv:1702.05798v1

@misc{1702.05798, author = {Clemens M.~Rumpf and Hugh G.~Lewis and Peter M.~Atkinson}, title = {{P}opulation {V}ulnerability {M}odels for {A}steroid {I}mpact {R}isk {A}ssessment}, year = {2017}, eprint = {1702.05798}, doi = {10.1111/maps.12861}, note = {arXiv:1702.05798v1} }
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An asteroid impact is a low probability event with potentially devastating consequences. The Asteroid Risk Mitigation Optimization and Research (ARMOR) software tool calculates whether a colliding asteroid experiences an airburst or surface impact and calculates effect severity as well as reach on the global map. To calculate the consequences of an impact in terms of loss of human life, new vulnerability models are derived that connect the severity of seven impact effects (strong winds, overpressure shockwave, thermal radiation, seismic shaking, ejecta deposition, cratering and tsunamis) with lethality to human populations. With the new vulnerability models ARMOR estimates casualties of an impact under consideration of the local population and geography. The presented algorithms and models are employed in two case studies to estimate total casualties as well as the damage contribution of each impact effect. The case studies highlight that aerothermal effects are most harmful except for deep water impacts, where tsunamis are the dominant hazard. Continental shelves serve a protective function against the tsunami hazard caused by impactors on the shelf. Furthermore, the calculation of impact consequences facilitates asteroid risk estimation to better characterize a given threat and the concept of risk as well as its applicability to the asteroid impact scenario are presented.
Fast atom diffraction inside a molecular beam epitaxy chamber, a rich combination
M. Debiossac, P. Atkinson, A. Zugarramurdi, M. Eddrief, F. Finocchi, V. H. Etgens, A. Momeni, H. Khemliche, A.G. Borisov, P. Roncin
Dec 31 2015 cond-mat.mtrl-sci physics.atom-ph arXiv:1512.09029v1

@misc{1512.09029, author = {M.~Debiossac and P.~Atkinson and A.~Zugarramurdi and M.~Eddrief and F.~Finocchi and V.~H.~Etgens and A.~Momeni and H.~Khemliche and A.G.~Borisov and P.~Roncin}, title = {{F}ast atom diffraction inside a molecular beam epitaxy chamber, a rich combination}, year = {2015}, eprint = {1512.09029}, note = {arXiv:1512.09029v1} }
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Two aspects of the contribution of grazing incidence fast atom diffraction (GIFAD) to molecular beam epitaxy (MBE) are reviewed here: the ability of GIFAD to provide \emphin-situ a precise description of the atomic-scale surface topology, and its ability to follow larger-scale changes in surface roughness during layer-by-layer growth. Recent experimental and theoretical results obtained for the He atom beam incident along the highly corrugated $[ 1\bar{1}0 ]$ direction of the $\beta_{2}$(2$\times$4) reconstructed GaAs(001) surface are summarized and complemented by the measurements and calculations for the beam incidence along the weakly corrugated [010] direction where a periodicity twice smaller as expected is observed. The combination of the experiment, quantum scattering matrix calculations, and semiclassical analysis allows in this case to reveal structural characteristics of the surface. For the in situ measurements of GIFAD during molecular beam epitaxy of GaAs on GaAs surface we analyse the change in elastic and inelastic contributions in the scattered beam, and the variation of the diffraction pattern in polar angle scattering. This analysis outlines the robustness, the simplicity and the richness of the GIFAD as a technique to monitor the layer-by-layer epitaxial growth.
Fourier synthesis of radio frequency nanomechanical pulses with different shapes
Florian J. R. Schülein, Eugenio Zallo, Paola Atkinson, Oliver G. Schmidt, Rinaldo Trotta, Armando Rastelli, Achim Wixforth, Hubert J. Krenner
Dec 04 2014 cond-mat.mes-hall cond-mat.other physics.optics arXiv:1412.1071v2

@misc{1412.1071, author = {Florian J.~R.~Schülein and Eugenio Zallo and Paola Atkinson and Oliver G.~Schmidt and Rinaldo Trotta and Armando Rastelli and Achim Wixforth and Hubert J.~Krenner}, title = {{F}ourier synthesis of radio frequency nanomechanical pulses with different shapes}, year = {2014}, eprint = {1412.1071}, howpublished = {Nature Nanotechnology 10, 512-516 (2015)}, doi = {10.1038/NNANO.2015.72}, note = {arXiv:1412.1071v2} }
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The concept of Fourier synthesis is heavily employed in both consumer electronic products and fundamental research. In the latter, pulse shaping is key to dynamically initialize, probe and manipulate the state of classical or quantum systems. In nuclear magnetic resonance, for instance, shaped pulses have a long-standing tradition and the underlying fundamental concepts have subsequently been successfully extended to optical frequencies and even to implement quantum gate operations. Transferring these paradigms to nanomechanical systems requires tailored nanomechanical waveforms. Here, we report on an additive Fourier synthesizer for nanomechanical waveforms based on monochromatic surface acoustic waves. As a proof of concept, we electrically synthesize four different elementary nanomechanical waveforms from a fundamental surface acoustic wave at $ f_1 \sim 150$ MHz using a superposition of up to three discrete harmonics $f_n$. We employ these shaped pulses to interact with an individual sensor quantum dot and detect their deliberately and temporally modulated strain component via the opto-mechanical quantum dot response. Importantly, and in contrast to the direct mechanical actuation by bulk piezoactuators, surface acoustic waves provide much higher frequencies (> 20 GHz) to resonantly drive mechanical motion. Thus, our technique uniquely allows coherent mechanical control of localized vibronic modes of optomechanical crystals, even in the quantum limit when cooled to the vibrational ground state.
An artificial atom locked to natural atoms
N. Akopian, R. Trotta, E. Zallo, S. Kumar, P. Atkinson, A. Rastelli, O. G. Schmidt, V. Zwiller
Feb 11 2013 cond-mat.mes-hall physics.atom-ph quant-ph arXiv:1302.2005v1

@misc{1302.2005, author = {N.~Akopian and R.~Trotta and E.~Zallo and S.~Kumar and P.~Atkinson and A.~Rastelli and O.~G.~Schmidt and V.~Zwiller}, title = {{A}n artificial atom locked to natural atoms}, year = {2013}, eprint = {1302.2005}, note = {arXiv:1302.2005v1} }
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Single-photon sources that emit photons at the same energy play a key role in the emerging concepts of quantum information, such as entanglement swapping, quantum teleportation and quantum networks. They can be realized in a variety of systems, where semiconductor quantum dots, or 'artificial atoms', are arguably among the most attractive. However, unlike 'natural atoms', no two artificial atoms are alike. This peculiarity is a serious hurdle for quantum information applications that require photonic quantum states with identical energies. Here we demonstrate a single artificial atom that generates photons with an absolute energy that is locked to an optical transition in a natural atom. Furthermore, we show that our system is robust and immune to drifts and fluctuations in the environment of the emitter. Our demonstration is crucial for realization of a large number of universally-indistinguishable solid-state systems at arbitrary remote locations, where frequency-locked artificial atoms might become fundamental ingredients.