ENGINEERING THE
QUANTUM
FUTURE
ABOUT US
The Center for
Quantum Nanoscience
Drawing on director Andreas Heinrich's scientific leadership, our Center has filled its world-class facility with ground-breaking tools and inquisitive minds immersed in a culture of exploration.
We are laying the foundation for future technology by exploring the use of quantum behavior atom by atom on surfaces with highest precision.
Area for QNS
Microscopy Labs
Facility for the High
Performance STM
as a Discussion and
Collaboration Space
EVENTS
Join our seminars and meet the QNS visitors!
https://www.traditionrolex.com/13
april
01aprallday31marJinhyoung LeeSungkyunkwan University (SKKU)(All Day) KST
Event Details
Jinhyoung Lee Affiliation: Sungkyunkwan University (SKKU) Research Interests: Atomic Force Microscopy, Scanning Tunneling Microscopy, Twistronicsvan der Waals
Event Details
Jinhyoung Lee
Affiliation: Sungkyunkwan University (SKKU)
Research Interests: Atomic Force Microscopy, Scanning Tunneling Microscopy, Twistronicsvan der Waals Materials
Time
April 1 (Monday) - March 31 (Monday)
Event Details
Joong Il Jake Choi Affiliation: Center for Nanomaterials and Chemical Reactions, IBS Research Interests: Surface Science Title
Event Details
Joong Il Jake Choi
Affiliation: Center for Nanomaterials and Chemical Reactions, IBS
Research Interests: Surface Science
Title: Lead-Halide Perovskite Surface Degradation: Insights from In Situ Atomic-Scale Analysis
Abstract: While organic-inorganic hybrid perovskites are emerging as promising materials for next-generation photovoltaic applications, the origins and the pathways of the instability of perovskites remain speculative. In particular, the degradation of perovskite surfaces by ambient water is a crucial sub-ject for determining the long-term viability of perovskite-based solar cells. Herein, we employ vari-able-pressure atomic force microscopy (VP-AFM) and near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) to carry out surface characterization and atomic-scale analysis of the reac-tion mechanisms for methylammonium lead bromide (MA(CH3NH3)PbBr3) single-crystal surfaces in environments ranging from ultra-high vacuum (UHV) to ambient pressures. MAPbBr3 single crystals grown in a solution process are mechanically cleaved at UHV to obtain an atomically clean surface. We observe surface inhomogeneity on the freshly cleaved MAPbBr3 surface: the coexist-ence of MA-terminated layers with cubic layer heights, and full and partial coverage of PbBr2-terminated defective layers with lower layer heights. Consecutive topography and friction force measurements in low pressure water (pwater ≈ 10–5 mbar) show the creation of degraded patches that are one atomic layer deep, gradually increasing their coverage until fully covers the surface at water exposure of 4.7 × 104 Langmuir. At the perimeters of these degraded patches, a higher friction coef-ficient was observed, along with an interstitial step height, which we attribute to a structure equiva-lent to that of the MA–Br terminated surface. Combined with NAP-XPS analysis, our results demonstrate that water vapor induces the dissociation of surface methylammonium ligands, eventu-ally resulting in the depletion of the surface MA and the full coverage of hydrocarbon species after exposure to 0.01 mbar of water vapor.
Time
(Tuesday) 10:00 am - 11:00 am
may
06mayallday09Markus AspelmeyerUniversity of Vienna(All Day) KST
Event Details
Markus Aspelmeyer Affiliation: University of Vienna Research Interests: Quantum Optomechanics, Quantum Measurement, Levitated Superconducting Gravimeters, Microscopic Source
Event Details
Markus Aspelmeyer
Affiliation: University of Vienna
Research Interests: Quantum Optomechanics, Quantum Measurement, Levitated Superconducting Gravimeters, Microscopic Source Masses, Gravitational Quantum Physics
Time
may 6 (Monday) - 9 (Thursday)
Event Details
Markus Aspelmeyer Affiliation: University of Vienna Research Interests: Quantum Optomechanics, Quantum Measurement, Levitated Superconducting Gravimeters, Microscopic Source
Event Details
Markus Aspelmeyer
Affiliation: University of Vienna
Research Interests: Quantum Optomechanics, Quantum Measurement, Levitated Superconducting Gravimeters, Microscopic Source Masses, Gravitational Quantum Physics
Title: Quantum sources of gravity: the next frontier of macrosopic quantum physics
Abstract: No experiment today provides evidence that gravity requires a quantum description. The growing ability to achieve quantum optical control over massive solid-state objects may change that situation — by enabling experiments that directly probe the phenomenology of quantum states of gravitational source masses. This can lead to experimental outcomes that are inconsistent with the predictions of a purely classical field theory of gravity. Such ‘Quantum Cavendish’ experiments will rely on delocalized motional quantum states of sufficiently massive objects and gravity experiments on the micrometer scale. I review the current status in the lab and the challenges to be overcome for future experiments.
Register here
Time
(Tuesday) 5:00 pm - 6:00 pm KST
Location
Center for Quantum Nanoscience
Research Cooperation Building,52 Ewhayeodae-gil, Daehyeon-dong
13mayallday31decLily WattThe University of British Columbia(All Day) KST
Event Details
Lily Watt Affiliation: The University of British Columbia Research Interests: Engineering physics, quantum technologies, machine learning for
Event Details
Lily Watt
Affiliation: The University of British Columbia
Research Interests: Engineering physics, quantum technologies, machine learning for robotics
applications
Time
May 13 (Monday) - December 31 (Tuesday)
21mayalldayChristian SchönenbergerUniversität Basel(All Day: tuesday) KST
Event Details
Christian Schönenberger Affiliation: Universität Basel Research Interests: nanoscience, nanoelectronics, quantum physics, quantum electronics
Event Details
Christian Schönenberger
Affiliation: Universität Basel
Research Interests: nanoscience, nanoelectronics, quantum physics, quantum electronics
Time
All Day (Tuesday)
21may3:30 pm4:30 pmChristian SchönenbergerUniversität Basel3:30 pm - 4:30 pm KST
Event Details
Christian Schönenberger Affiliation: Universität Basel Research Interests: nanoscience, nanoelectronics, quantum physics, quantum electronics Title:
Event Details
Christian Schönenberger
Affiliation: Universität Basel
Research Interests: nanoscience, nanoelectronics, quantum physics, quantum electronics
Title: Nanowire-based semi- and superconducting qubits
Abstract: There are a wide variety of physical qubit realizations even in the solid-state alone: transmon, fluxonium, charge, spin, valley, Andreev, and impurity-based qubits. In the quantum- and nanoelectronics group at the University of Basel, we currently work on a range of qubits realized in InAs and GeSi core shell semiconducting nanowires. We have realized Andreev, spin and gatemon qubits. Since time does not permit to address all our results in one lecture, I will focus on two experiments: a) on a singlet-triplet spin qubit based on a double quantum dot realized in a high-quality InAs nanowire, in which zinc-blende and wurzite segments can be controlled with atomic precission; and b) on Andreev qubits realized in InAs nanowires that are coated by a superconducting Al layer in-situ in order to proximitized InAs. For both cases we demonstrate strong coupling to microwave photons in a coplanar transmission line resonator. In case of the Andreev qubits, we could even demonstrate remote qubit-qubit coupling. For this purpose, we have engineered a dedicated coupler circuit that consist of two capacitively linked λ quarter resonators. This system has two distinct modes, a coupler and a readout mode. If both qubits are tuned into resonance to the coupler mode, qubit-qubit operation is possible without loss to the readout line. The challenge for future applications in this platform lies on reaching a large enough parity protection.
Time
(Tuesday) 3:30 pm - 4:30 pm
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Ewha Womans University 52 Ewhayeodae-gil,
Daehyeon-dong, Seodaemun-gu