Seminars 2017

2017-04-19: Applied Physics Seminar
Title: Quantum technology and the control of coherence in quantum networks
Speaker: Prof. Giorgos Tsironis, Center for Quantum Complexity and Nanotechnology, Department of Physics, University of Crete
Location: Room FB42, KTH AlbaNova
Time: 09:15-10:00
Abstract: Macroscopic quantum devices are becoming reality not only for computational purposes but also as sensors and for other general applications.  A quantum superconducting chip with reasonable number of qubits -of order 20- is close to being build with decoherence times in the order of milliseconds.  In this talk we will focus on superconducting technology and analyze the emergence of coherence in coupled networks of meta-atoms made of units such as SQUIDS and Josephson junctions.  These networks may operate classically in a negative permeability regime, induce intrinsic nonlinear localized modes, tame disorder through hysteretic loops or transmit through nonlinear frequency bands. In the quantum regime, on the other hand, meta-atoms may interact through injected electromagnetic fields and form propagating “quantum breathers”, i.e. compound semiclassical propagating modes induced by the nonlinearity of the qubit-field interaction.   These coherent modes generate self-induced transparency in the medium and in certain cases may also induce superradiance.

2017-05-12: PhD defence by Saroosh Shabbir
Title: Majorana Representation in Quantum Optics - SU(2) Interfermometry and Uncertainty Relations
Candidate: Saroosh Shabbir
Time: 13:00
Location: Seminar room FA31, AlbaNova University Center
Opponent: Prof. Maria Checkova, Max-Planck Institute for the Science of Light, Erlangen, Germany
Supervisor: Prof. Gunnar Björk, Department of Applied Physics KTH, Stockholm

2017-04-19: Quantum Materials and Photonics seminar
Title: New silicon photonic components enabled by MEMS technology
Speaker: Asst Prof. Kristinn B. Gylfason, MST, KTH
Location: Room FA31, KTH AlbaNova
Time: 11:00-12:00
Abstract: Silicon photonics is the study and application of integrated optical systems which use silicon as an optical medium, usually by confining light in optical waveguides etched into the surface of silicon-on-insulator (SOI) wafers. Microelectromechanical systems (MEMS) refers to the technology of mechanics on the microscale actuated by electrostatic actuators. Due to the low power requirements of electrostatic actuation, MEMS components are very power efficient, making them well suited for dense integration and mobile operation. MEMS components are conventionally also implemented in silicon, and due to the success of the silicon MEMS platform, MEMS sensors such as accelerometers, gyros, and microphones are now standard in every smartphone. By combining these two successful technologies in a single SOI wafer, new active photonic components with extremely low power consumption can be made. We discuss our recent experimental work on tunable filters, tunable fiber-to-chip couplers, and thermal emitters and detectors enabled by the marriage of silicon MEMS and silicon photonics.

2017-04-18: Seminar by PRL Editor
Title: Successful Letters in Physical Review Letters: An Editor’s perspective
Speaker: Dr. Serena Dalena,  Associate Editor of PRL
Location: Room FA32, KTH AlbaNova
Time: 15:00-16:00, April 18, 2017.
Abstract: Physical Review Letters publishes over 20,000 pages of scientific content per year while maintaining its presence as the premier physics journal. The purpose of this talk is to shed light into PRL editorial process and policy and address the many questions frequently raised by the thousands of active authors, referees and readers. How do the editors determine which papers to publish in PRL? What how-tos should you know as an author and a referee? Why should you submit your work to us? How are journals in general and PRL in particular reorienting amid increasing competition and other challenges? I plan to address these and related issues during my presentation and the subsequent discussion.

2017-04-07: PhD defence by Miguel Iglesias Olmedo
Title: Impairment Mitigation in High Capacity and Cost-efficient Optical Data Links
Candidate: Miguel Iglesias Olmedo
Time: 10 AM
Location: Hall B, Electrum, KTH Kista
Opponent: Prof. Marco Santagustina, University of Padova, Italy
Supervisor: Prof. Sergei Popov, Adj. Prof. Gunnar Jocobsen

2017-04-06: Seminar by Marco Santagiustina
Title: Research activities at the Photonic and Electromagnetics Group (PEG) of the University of Padova
Speaker: Prof. Marco Santagiustina
Time: April 6, 14:30
Place: Darlington, B4, Electrum, KTH Kista
Abstract: A survey of the ongoing research activities of PEG will be given. In the field of fiber optics the group has contributed
to the modelling and characterization of linear and nonlinear effects and the mastering of back-scattering techniques has opened
a new research area in the field of fiber optics sensors. Modelling complex photonic waveguides has been also an active research topic that will be briefly described.

2017-04-06: KTH-IEEE seminar on "Cultural Competence"
Title: Cultural Competence - A Key Skill to Work Successfully in International Teams
Speaker: Ekaterina von Gertten, Aperian Global
Organizer: Elena Vasilieva, KTH, IEEE WIE, IEEE Sweden
Time: 6 Apr 2017, 17:00 – 19:00
Location: KTH, Electrum, sal B
Abstract: In collaboration with Royal Institute of Technology, IEEE and Aperian Global, we invite you to join us for an evening of insights & discussion. In such a fast developing globalized world, the majority of us are members of an international team. This means that one has to create relationships and get work done through communicating across cultural boundaries. Cultural competence is now considered one of the key skills to succeed with an international career and the lack of it is viewed as one of the biggest obstacles for achieving efficiency in diverse teams. During the presentation, participants will: (1) Learn how our cultural background shapes our personalities & behaviors in the workplace; (2) Explore cultural dimensions & GlobeSmart, the industry-leading cultural inventory; (3) Gain tools & strategies for developing cultural agility
More info CulturalCompetenceKeynote Flyer.pdf (pdf 476 kB)

2017-03-29: Quantum Materials and Photonics seminar
Title: Quantum dots in nanowires, a novel solid-state platform for quantum optics and hybrid nanomechanics
Speaker: Dr. Julien Claudon, CEA in Grenoble, France
Time: 29 March, 1-2pm
Location: FA31, KTH AlbaNova
Abstract: Abstract in PDF (pdf 159 kB)

2017-03-22: Quantum Materials and Photonics seminar
Filamentation of ultrashort laser pulses in air
Speaker: Andre Mysyrowicz, from Laboratoire d'Optique Appliquée, France
Time: 22 March, 1-2 pm
Location: Room FA31, KTH AlbaNova
Abstract Abstract_QMP_20170322 (pdf 131 kB)

2017-03-15: Quantum Materials and Photonics seminar
Qubiz: Tunnelling the Barrier – Bringing Quantum Technologies to Market
Speaker: Cathal Mahon from Qubiz, Quantum Innovation Center, Copenhagen
Time: 11-12 noon
Location: FB42, KTH AlbaNova
Abstract: Qubiz: Quantum Innovation Center is a National Center dedicated to leveraging the very strong and unique research position within Quantum Physics in Denmark with a view to Commercializing Quantum Technologies. It represents Innovation Fund Denmark’s biggest single investment (potentially up to 22M€) with almost an additional 30 M€ from University and Industrial Partners over the planned 5-year period.

2017-02-22: Quantum Materials and Photonics seminar
Title: Rare earth ion doped crystals for quantum technology
Speaker: Stefan Kröll, Lund University
Time: 11-12 noon
Location: KTH AlbaNova
Abstract: Rare earth ions doped into inorganic crystals can remain in quantum superposition states during several hours and it is possible to entangle ions in spatially remote crystals with each other. This talk will review how rare earth ion doped crystals can be used in quantum tasks and in particular as quantum memories. If time permits the talk may also touch on slow light effects in these materials. The talk will be aimed to a general physics audience with interest in coherent interactions between light and matter.

2017-02-22: Quantum Materials and Photonics seminar
Title: The latest (monolayer WSe2) and greatest (InGaAs quantum dots) in solid-state quantum emitters
Speaker: Brian Gerardot,  Quantum Photonics Laboratory, Heriot-Watt University
Time: 11-12 noon
Location: FA31, KTH AlbaNova
Abstract: Motivated by potential technologies that exploit quantum mechanical superposition and entanglement, I will present our recent progress in the application of quantum optical techniques to coherently probe and manipulate solid-state quantum emitters. I will first discuss resonance fluorescence from single self-assembled InGaAs quantum dots, focusing particularly on the generation of ultra-coherent, indistinguishable photons in spite of the presence of environmental noise induced by nearby fluctuating nuclear spins or electronic charges.  I will then present recent work on a “new” quantum emitter: a localised exciton in a WSe2 monolayer. Such a two-dimensional transition metal dichalcogenide semiconductor is an intriguing host for a quantum emitter due its unique optical, electronic, and structural properties. I will show how such emitters can be both spatially and spectrally localised via strain gradients and probe their magneto- and quantum-optical properties.  These results raise the prospect to deterministically strain-engineer arrays of quantum emitters in two-dimensional semiconductors.

2017-02-21: Seminar by Val Zwiller
Title: Communicating with light
Speaker: Val Zwiller, QNP and ADOPT, KTH
Time: 5-6:30 PM
Location: Dome of Visions, Valhallavägen 79 
Abstract: The seminar describes how light as an electromagnetic wave can be used in optical communications (fiber optics) and imaging.

2017-02-14: Quantum Materials and Photonics seminar
Title: Nanophotonic circuits for unconventional computing
Speaker: Prof. Wolfram Pernice, University of Muenster, Germany
Time: 11am-12noon
Location: FA32, KTH AlbaNova
Abstract: Nanophotonic circuits employ waveguiding devices to route light across quasi-planar integrated optical chips in analogy to electrical wires in integrated electrical circuits. Using materials with high refractive index allows for confining light into sub-wavelength dimensions as efficient optical wires. This way complex systems can be assembled from individual photonic building blocks using reliable nanofabrication routines. Besides applications in classical information processing and sensing, nanophotonic circuits provide interesting options for optical computing when combined with functional materials. Here I will give an overview of two recent efforts to realize the constituents for non-traditional computing architectures. Both approaches employ near-field coupling to nanophotonic waveguides as a resource to tailor light-matter interactions within an on-chip circuit architecture. I will introduce phase-change nanophotonic circuits as a platform for arithmetic processing, where calculation and storage of results are carried out in the same physical location. This approach allows for performing basic arithmetic on chip in an all-optical fashion. As an alternative, I will describe how nanophotonic circuits provide a rich toolbox for non-classical computations when operated at the single photon level. In this case, nanoscale fabrication enables the scalable realization of the building blocks required for linear optical quantum computing. I will present recent results on establishing such a platform with pure electronic control and nanoscale footprint.

2017-02-10: Quantum Materials and Photonics seminar
Title: Atomistic Modeling of Excitonic States in Semiconducting Nanostructures
Speaker: Prof. Michał Zieliński, Nicolaus Copernicus University
Time: 11am-12noon
Location: FA31, KTH AlbaNova
Abstract: See the attachment (pdf 201 kB)

2017-02-08: Quantum Materials and Photonics seminar
Title: Quantum optics with new toys
Speaker: Prof. Radek Łapkiewicz, University of Warsaw
Time: 11am-12noon
Location: FA32, KTH AlbaNova
I will discuss a few experiments with photons, trying to convince you that:
1. It is possible to image objects without detecting the light scattered by them.
2. Correlations between two particles can be witnessed by detecting only one particle.
3. Spatial phase of a single photon can be measured.
The experiments share the idea of replacing single pixel detectors with cameras in the classic setups of Leonard Mandel.

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