ICPS 2014

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14:00-14:15
Oral: Su-Hyun Gong
Strong Purcell Enhancement by Deterministic Plasmonic Nanofocusing in Single Quantum Dot
Co-authors: Je-Hyung Kim, Young-Ho Ko, Christophe Rodriguez, Jonghwa Shin, Yong-Hee Lee, Le Si Dang, Xiang Zhang, Yong-Hoon Cho

14:15-14:30
Oral: Kobi Cohen
Highly Directional Emission of Photons from Nanocrystal Quantum Dots Positioned on Circular Plasmonic Lens Antennas
Co-authors: Moshe Harats, Nitzan Livneh, Shira Yochelis, Yossi Paltiel, Ronen Rapaport

14:30-14:45
Oral: T. Sverre Theuerholz
Theory of Quantum Emission Statistics of Nanoplasmonic Hybrid Systems
Co-authors: Michael Gegg, Andreas Knorr, Marten Richter

14:45-15:00
Oral: Fabrice Laussy
Violation of Cauchy-Schwarz & Bell's Inequalities in the Light Emitted by a Quantum Dot
Co-authors: Carlos Sánchez-Muñoz, Elena del Valle, Carlos Tejedor

15:00-15:30
Invited: Bart de Nijs
Squeezing Light into Nanogaps: Plasmonics in the Sub-nm & Quantum Domains

Coupling between plasmonic nano-components generates strongly red-shifted resonances combined with intense local field amplification on the nanoscale. This allows directly seeing molecules as well as excitations in semiconductors. We have recently explored plasmonic coupling which can be tuned dynamically, through reliable bottom-up self-assembly. The crucial aspect of these systems is the extreme sensitivity to separation, and how quantum tunneling starts to be directly seen at room temperature in ambient conditions. We recently demonstrated how quantum plasmonics controls the very smallest space that light can be squeezed into. We also demonstrate the possibility to track few molecules using the extreme enhancements. We show how the new generation of 2D semiconductors can couple to such nano-scale gaps utilizes our nanoparticle on mirror geometry.

[1] Nature 491, 574 (2012); Revealing the quantum regime in tunnelling plasmonics.
[2] Nano Letters 10, 1787 (2010); Actively-Tuned Plasmons on Elastomeric Au NP Dimers.
[3] ACS Nano 5, 3878 (2011); Precise sub-nm plasmonic junctions within Au NP assemblies.
[4] Nano Lett 11, 5339 (2011); Surface-Enhanced CARS on Nanostructured Au Surfaces.
[5] Nano Lett 13, 5033 (2013); Controlling sub-nm plasmonic gaps using graphene.

Co-authors: Lindsey Ibbotson, David Leipold, Erich Runge, G. Vijaya Prakash, Jeremy Baumberg

15:30-15:45
Oral: Chris Phillips
Quantum Metamaterials & Strongly-Coupled Systems; New Physics from Semiconductor Nano-structures
Co-authors: Alex Bak, Francis Murphy, Hemmel Amrania, Vincenzo Giannini, Simone De Liberato, Stefan A. Maier

15:45-16:00
Oral: David Colas
Spacetime Rabi Oscillations
Co-authors: Fabrice Laussy

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8:30-8:45
Oral: Marco Felici
Single Photons on Demand from Novel Site-Controlled GaAsN/GaAsN:H Quantum Dots
Co-authors: Simone Birindelli, Johannes Wildmann, Giorgio Pettinari, Antonio Polimeni, Mario Capizzi, Annamaria Gerardino, Silvia Rubini, Faustino Martelli, Armando Rastelli, Rinaldo Trotta

8:45-9:00
Oral: Clement Jarlov
Effect of Dephasing on the Coupling of Quantum Dot Excitons & Optical Cavities
Co-Authors: Etienne Wodey, Alexey Lyasota, Milan Calic, Pascal Gallo, Alok Rudra, Benjamin Dwir, Elyahou Kapon

9:00-9:30
Invited: Julia Kabuss
Theory of an Optically Driven Quantum Dot Phonon Laser

Recent technological progress in the area of nanophononics and the design of high $Q$ phonon cavities [acoustic nanocavities, nanomechanical oscillators] constitutes the basis for new applications, such as phonon lasers. As an acoustic pendent to the optical lasers, the concept of stimulated emission can be generalized onto phononic systems. As a source of coherent and nonequilibrium phonons, we propose a optically pumped quantum-dot-acoustic cavity system, operated as a phonon laser. Next to a full quantum theory approach [J. Kabuss et al. Phys. Rev. Lett. 109, 054301 (2012)], where we study the statistical properties of the phonon emission, we further develop an effective semiclassical treatment [J. Kabuss et al., Phys. Rev. B, 88, 064305 (2013)]. Deriving analytical formulas for the statistics, phonon number and threshold properties we give an analysis of the operational limits and regimes of such a phonon source. Even though the equations exhibit new contributions, we find a strong resemblance to an incoherently pumped single atom laser exhibiting the typical self-quenching behavior. In contrast to the incoherently pumped atom case, however, a medium pure dephasing as present in the semiconductor case conveniently counteracts this feature.

Co-authors: Alexander Carmele, Andreas Knorr

9:30-9:45
Oral: Thorsten Reichert
Directed Emission from InGaAs Quantum Dots into Guided Photonic Crystal Waveguide Modes: Purcell Effect & Disorder
Co-authors: Stefan Lichtmannecker, Julia Wembacher, Max Bichler, Michael Kaniber, Jonathan J. Finley

9:45-10:00
Oral: Michele Montinaro
Quantum Dot Opto-Mechanics in a Fully Self-Assembled Nanowire
Co-authors: Gunter Wüst, Mathieu Munsch, Yannik Fontana, Eleonora Russo-Averchi, Daniel Rüffer, Martin Heiss, Anna Fontcuberta i Morral, Richard J. Warburton, Martino Poggio

10:00-10:15
Oral: Tomasz Jakubczyk
Inhibition & Enhancement of the Spontaneous Emission of Quantum Dots in Micropillar Cavities with Radial Bragg Reflectors
Co-authors: Helena Franke, Tomasz Smolenski, Maciej Sciesiek, Wojciech Pacuski, Andrzej Golnik, Rudiger Schmidt-Grund, Marius Grundmann, Carsten Kruse, Detlef Hommel, Piotr Kossacki

10:15-10:30
Oral: Mirco Kolarczik
Quantum Coherence Induces Pulse Shape Modification in a Semiconductor Optical Amplifier at Room Temperature
Co-authors: Nina Owschimikow, Julian Korn, Benjamin Lingnau, Yücel Kaptan, Dieter Bimberg, Eckehard Schöll, Kathy Lüdge, Ulrike Woggon 

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11:00-11:15
Oral: Christof P. Dietrich
Bose-Einstein Condensation of Whispering Gallery Mode Exciton-Polaritons in ZnO Micro-Wire Resonators
Co-authors: Robert Johne, Tom Michalsky, Chris Sturm, Paul Eastham, Helena Franke, Marius Grundmann, Rüdiger Schmidt-Grund

11:15-11:30
Oral: Gregory Fuchs
A Single-Molecule Approach to ZnO Defect Studies: Single Photons & Single Defects
Co-authors: Nicholas Jungwirth, Yun-Yi Pai, Hung Shen Chang, Evan MacQuarrie

11:30-11:45
Oral: Kazuki Kaneko
Simultaneous Control of Position, Density, Preferential Orientation of Nitrogen-Vacancy Centers in CVD-Grown Diamond Thin Film on Micropatterned Substrate
Co-authors: Tomohiro Gomi, Koji Fujisawa, Hideyuki Watanabe, Hitoshi Umezawa, Shinichi Shikata, Kohei M. Itoh, Junko Ishi-Hayase

11:45-12:00
Oral: Konstantin Litvinenko
Phosphorus Atoms in Silicon for Quantum Information Applications & as Analogues of Free Hydrogen Atoms on High Magnetic Field White Dwarf Stars
Co-authors: Juerong Li, Ellis Bowyer, Ben Murdin, Carl Pidgeon, Hans Engelkamp, Sergeij Pavlov, H. Hubers

12:00-12:15
Oral: F. Liu
Phonon-Assisted Population Inversion of a Single Quantum Dot
Co-authors: J.H. Quilter, A.J. Brash, M. Glässl, A.J. Ramsay, A.M. Fox, M.S. Skolnick

12:15-12:30
Oral: Maxim Makhonin
On-Demand Coherent Single Photon Source in Waveguide Geometry for Quantum Optical Circuit Implementation
Co-authors: James Dixon, Rikki Coles, Ben Royal, Edmund Clarke, Mark Fox, Maurice Skolnick

12:30-12:45
Oral: Raphael Proux
Controlling the Indistinguishability of Photons from a Resonantly Excited Semiconductor Quantum Dot
Co-authors: Maria Maragkou, Emmanuel Baudin, Christophe Voisin, Philippe Roussignol, Carole Diederichs

12:45-13:00
Oral: Gunther Reithmaier
Ultra-Slow Exciton Relaxation in InGaAs Quantum Dots Probed Using an Integrated Superconducting Single Photon Detector
Co-authors: Fabian Flassig, Peter Hasch, Max Bichler, Michael Kaniber, Jonathan Finley 

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14:30-14:45
Oral: Gustavo D. Cipagauta
Detuning-Control of Exciton Entanglement in Two Quantum Dots Coupled to a Photonic Mode
Co-authors: Karen M. Fonseca-Romero

14:45-15:00
Oral: Amir Capua
Direct Observation of Wavefunction Decoherence & Control over the Electronic Quantum State in a Room-Temperature InAs/InP Quantum Dot Semiconductor Optical Amplifier
Co-authors: Ouri Karni, Gadi Eisenstein, Vitalii Ivanov, Vitalii Sichkovskyi, Johann Peter Reithmaier

15:00-15:30
Invited: Jonathan H. Prechtel
Coherent Population Trapping on a Single Hole Spin in a Semiconductor Quantum Dot
Co-authors: Andreas V. Kuhlmann, Julien Houel, Arne Ludwig, Andreas D. Wieck, Richard J. Warburton

The coherence of an electron spin qubit in a semiconductor quantum dot (QD) is limited by the hyperfine interaction with the nuclear spins. Switching to a hole spin may bypass this problem. The hyperfine interaction of a pure heavy hole spin has a dipole-dipole term along the growth direction only such that the coupling to the nuclear spins is highly suppressed in an in-plane magnetic field [1]. We explore here the extent to which this ideal limit can be achieved in practice using coherent population trapping (CPT), a quantum interference which arises between two ground states, here the hole spin states, and a common upper level, here the exciton state of an InGaAs quantum dot. CPT enables a precise spectroscopic measurement of the hole Zeeman splitting ZH and also a probe of hole spin decoherence. The long hole spin coherence enables us to achieve CPT dips of just 33 neV (8 MHz) width.

We find that ZH depends on vertical electric field, F. While ZH is QD-dependent, dZH/dF is largely the same for all QDs in our sample. We show that via this mechanism, charge noise results in significant hole spin dephasing in our good but imperfect device. The interaction with the nuclear spins is quantified by polarizing the nuclear spins optically, measuring ZH with CPT. In an in-plane magnetic field of 3 T, ZH remains the same (to within our error of 20 neV) even as the electron Zeeman energy changes by 12 eV. This demonstrates a remarkably effective decoupling of the hole spin from the nuclear spins.

[1] J. Fischer et al, Phys. Rev. B 78, 155329 (2008).

15:30-15:45
Oral: Carlos Anton
Momentum Space Interferences as an Evidence of Remote Quantum Coherence of Condensates
Co-authors: Guilherme Tosi, Maria Dolores Martin, Zacharias Hatzopoulos, Georgios Konstantinidis, Peter Eldridge, Pavlos Savvidis, Carlos Tejedor, Luis Viña

15:45-16:00
Oral: Yves Leandre Delley
Coherent Spin Qubits in Optically Active InGaAs Quantum Dots
Co-authors: Wei-bo Gao, Aymeric Delteil, Priska Studer, Martin Kroner, Stefan Fält, Werner Wegscheider, Ataç İmamoğlu

16:00-16:15
Oral: John Bradley
Nano-Epitaxy as a Platform for Quantum Photonics
Co-authors: Andrew Foster, Andrey Krysa, Ben Royall, Paul Fry, Maurice Skolnick, Luke Wilson

16:15-16:30
Oral: Clemens Matthiesen
Measuring the Local Environment of a Quantum Dot
Co-authors: Megan Stanley, Jack Hansom, Claire Le Gall, Mete Atature

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10:20-10:35
Oral: Bart de Nijs
Image Excitons & Plasmon-Exciton Strong Coupling in 2D Perovskite Semiconductors
Co-authors: Wendy Niu, Lindsey Ibbotson, David Leipold, Erich Runge, G. Vijaya Prakash, Jeremy Baumberg

10:35-10:50
Oral: Danqing Wang
Progress Towards Coupling of InGaN QDs & GaN Nanobeam Cavities
Co-authors: Tim Puchtler

10:50-11:20
Invited: Robert Stockill
Direct Photonic Coupling of a Quantum Dot & a Trapped Ion
Co-authors: Claire Le Gall, Matthias Steiner, Hendrik-Marten Meyer, Clemens Matthiesen, Jakob Reichel, Edmund Clarke, Arne Ludwig, Michael KohlMete Atature

Confined spins in solids and electronic states of single atoms present two well-studied, contrasting systems which may be suitable for the construction of a hybrid network of complementary quantum devices. However, their disparate physical properties raise the question of the feasibility of realising a direct interface. Here, we present the first successful photonic coupling between a semiconductor quantum dot (QD) and a single atom. We show that resonantly scattered photons from a self-assembled InGaAs QD can be absorbed by a single Ytterbium ion trapped in a high-finesse fibre-based cavity.

An optical link in the near-infrared is formed by bringing the quantum dot into resonance with an atomic Yb+ transition at 935 nm. By monitoring ion state transfer due to quantum dot photon absorption we extract photon absorption rates. We find a peak efficiency of above 1% per QD photon arriving at the ion-cavity system.

Whilst the natural spectral linewidths of the quantum dot and ion transitions differ by a factor of >60, sub linewidth emission spectra have been demonstrated from QDs through low power coherent scattering (s « 1), enabling bandwidth matching to the narrow ion transition. We study the extent to which efficient coupling relies on coherent scattering. Furthermore we observe ion absorption rates dependent on spin state preparation of a negatively charged quantum dot. Based on these results, the exchange of quantum information between these highly contrasting systems is within experimental reach.

11:20-11:35
Oral: Savvas Germanis
Near RT Emission from a Single Piezoelectric InAs Quantum Dot & Temperature Dependent Anti-Bunching Experiments
Co-authors: Léonard Monniello, Richard Hostein, Antonis Stavrinidis, George Constantinidis, Zacharias Hatzopoulos, Valia Voliotis, Nikos Pelekanos

11:35-11:50
Oral: Andreas V. Kuhlmann
Spin Noise in a Self-Assembled Semiconductor Quantum Dot
Co-authors: Jonathan H. Prechtel, Julien Houel, Arne Ludwig, Dirk Reuter, Andreas D. Wieck, Richard J. Warburton

11:50-12:05
Oral: Hidekazu Kumano
Second-Order & Bosonic Interference Properties of a Quantum Dot with Silver Microcolumnar Photon Reflector
Co-authors: Liu Xiangming, Hideaki Nakajima, Satoru Odashima, Ikuo Suemune

12:05-12:20
Stephan Kapfinger
Radio Frequency Acousto-Mechanical Tuning of a Photonic Molecule 
Co-authors: Thorsten Reichert, Michael Kaniber, Jonathan J. Finley, Achim Wixforth, Hubert J. Krenner 

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8:30-8:45
Oral: Inah Yeo
Strain-Mediated Coupling Between a Nano-Mechanical Oscillator & a Single Quantum Dot
Co-authors: Pierre-Louis de Assis, Arnaud Gloppe, Eva Dupont-Ferrier, Pierre Verlot, Nitin Malik, Emmanuel Dupuy, Julien Claudon, Jean-Michel Gérard, Alexia Auffèves, Gilles Nogues, Signes Seidelin, Jean-Philippe Poizat, Olivier Arcizet, Maxime Richard

8:45-9:00
Oral: Lloyd Tinkler
Picosecond Spatio-Temporal Solitons in Highly Nonlinear Exciton-Polariton Waveguides
Co-authors: Paul Walker, Dmitry Skryabin, Alexey Yulin, Ben Royall, Dimitrii Krizhanovskii, Maurice Skolnick, Ian Farrer, David Ritchie

9:00-9:15
Oral: Luis Vina
Quantum Ping-Pong & Shunting of Polariton Condensate Wave Trains: Implementation of a Logic & Gate
Co-authors: C. Anton, T. C. H. Liew, J. Cuadra, M. D. Martín, P. S. Eldridge, Z. Hatzopoulos, G. Stavrinidis, P. G. Savvidis

9:15-9:30
Oral: Tobias Gokus
Nanoscale Free-Carrier Profiling of Individual Semiconductor Nanowires by Infrared Near-Field Microscopy
Co-authors: Andreas Huber, Johannes Stiegler, Rainer Hillenbrand

9:30-9:45
Oral: Emma Schmidgall
Three Photon Radiative Cascades from a Single Quantum Dot
Co-authors: Liron Gantz, Dan Cogan, Eli Bordo, David Gershoni

9:45-10:00
Oral: Ido Schwartz
Deterministic Writing & Control of the Dark Exciton State Using Short Single Optical Pulses
Co-authors: Ido Schwartz, Liron Gantz, Dan Cogan, David Gershoni

10:00-10:15
Oral: Glenn Solomon
Temporal Variations in the Nonclassical Light Properties from a Single Quantum-Dot State
Co-authors: T. Thomay, E.B. Flagg, E. Goldschmidt, V. Loo, S.V. Polyakov, A. Migdall

10:15-10:30
Oral: Baoquan Sun
Tuning Biexciton Antibinding-Binding Transition & Fine Structure Splitting
Co-authors: Xuefei Wu, Xiuming Dou, Kun Ding, Ying Yu, Haiqiao Ni, Zhichuan Niu, Yang Ji, Shushen Li, Desheng Jiang, Guang-can Guo, Hai Wei, Lixin He

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11:00-11:15
Oral: Nikola Prtljaga
Electrical Control of On-Chip Single-Photon Routing
Co-authors: Chris Bentham, Igor Itskevich, Rikki Coles, Nikola Prtljaga, Ben Royall, Maurice Skolnick, Luke Wilson

11:15-11:30
Oral: Maaike Bouwes Bavinck
Crystal-Phase Quantum Devices
Co-authors: Simone Assali, Thuy Vu, Klaus Joens, Jia Wang, Marcel Verheijen, Jos Haverkort, Erik Bakkers, Jean-Christophe Harmand, Val Zwiller, Nika Akopian

11:30-11:45
Oral: Ekaterina Chernysheva
Single Photon Emitters Based on (In,Ga)N Quantum Disks Embedded into Ordered Arrays of GaN Nanowires
Co-authors: Snezana Lazic, Zarko Gacevic, Noemi García-Lepetit, Steven Albert, Ana Bengochea-Encabo, Marcus Müller, Frank Bertram, Juergen Christen, Herko van der Meulen, Jose Manuel Calleja, Enrique Calleja

11:45-12:00
Oral: Somsak Panyakeow
GaSb/GaAs, InSb/GaAs & InAs/GaAs Quantum Dots on Ge for Nanophotonic Devices
Co-authors: Suwit Kiravittaya, Supachok Thainoi, Songphol Kanjanachuchai, Somchai Ratanathammaphan

12:00-12:15
Oral: Nikola Prtljaga
Integration of Quantum Emitter with On-Chip Beam-Splitter for Quantum Information Processing
Co-authors: Rikki J Coles, John O'Hara, Benjamin Royall, Anthony M Fox, Edmund Clarke, Maurice S Skolnick

12:15-12:30
Oral: Elena del Valle
Engineering Quantum Light Sources through Frequency Filtering
Co-authors: Alejandro González-Tudela, Carlos Sánchez-Muñoz, Carlos Tejedor, Fabrice Laussy

12:30-12:45
Oral: Je-Hyung Kim
A High Efficiency Single Photon Source from Dislocation- & Polarization Field-Eliminated Group III-Nitride Vertical Nanostructures
Co-authors: Young-Ho Ko, Su-Hyun Gong, Suk-Min Ko, Yong-Hoon Cho

12:45-13:00
Oral: Carlos Sanchez Munoz
Emitters of N-photon bundles
Co-authors: Elena del Valle, Alejandro González Tudela, Carlos Tejedor, Fabrice P. Laussy