167 research outputs found
Topological pumping of photons in nonlinear resonator arrays
We show how to implement topological or Thouless pumping of interacting
photons in one dimensional nonlinear resonator arrays, by simply modulating the
frequency of the resonators periodically in space and time. The interplay
between interactions and the adiabatic modulations enables robust transport of
Fock states with few photons per site. We analyze the transport mechanism via
an effective analytic model and study its topological properties and its
protection to noise. We conclude by a detailed study of an implementation with
existing circuit QED architectures.Comment: 5 pages, 4 figures, and Supplemental Material. Comments are welcom
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A comparative impact of cause-related marketing and sponsorship leveraged internet display advertising
Cause-related marketing (CRM) and sponsorship activities have become an increasingly popular corporate social responsibility (CSR) strategy, whereby firms partner with non-profit organisations (NPOs) to achieve varieties of business objectives, while still supporting NPOs social causes. Advances in internet technology and e-commerce activities have facilitated the widespread use of internet CRM and sponsorship advertisement frames targeting potential donors and online customers. Typically, firms communicate through ads in a variety of ways, such as offering a precise donation amount (PDA) to the charity organisation in question, or by declaring mutually beneficial collaboration of the firms brand with the non-profit organisation (NPO), by stating an imprecise donation (IDA)offer. This study compares the effectiveness of PDA ads (both at low and high donation amounts) with imprecise donation amount (IDA) internet display advertisement frames, in terms of attitude and purchase intention from a fundraising perspective. Using a web-based experimental survey design involving the national representative sample, the results of the ANCOVA analysis revealed that there is no significant difference in attitudes between precise and imprecise donation ad frames(PDA & IPA). However, PDA advertisements were found to indicate higher purchase intention than the IDA ad frame; regardless of the perceived donation amounts were either low or high. Furthermore, PDA ads with higher donation amounts (versus low donation amount) engender greater purchase. This study contributes to the understanding of the effective use of cause-related and sponsorship internet ads, for consumer segmentation and targeting
Exploring Andragogy: Understanding the Implications for Teaching in Higher Education
Andragogy is the theory and practice of educating adults. What are the differences between teaching HE students of different age groups? Do these differences become more prevalent with age, and does this matter? Should we revise our teaching practices to maximise engagement with mature students
Zinc Finger Artificial Transcription Factor-Mediated Chloroplast Genome Interrogation in Arabidopsis thaliana
The large majority of core photosynthesis proteins in plants are encoded by nuclear genes, but a small portion have been retained in the plastid genome. These plastid-encoded chloroplast proteins fulfill essential roles in the process of photochemistry. Here, we report the use of nuclear-encoded, chloroplast-targeted zinc finger artificial transcription factors (ZF-ATFs) with effector domains of prokaryotic origin to modulate the expression of chloroplast genes, and to enhance the photochemical activity and growth characteristics of Arabidopsis thaliana plants. This technique was named chloroplast genome interrogation. Using this novel approach, we obtained evidence that ZF-ATFs can indeed be translocated to chloroplasts of Arabidopsis plants, can modulate their growth and operating light use efficiency of PSII, and finally can induce statistically significant changes in the expression levels of several chloroplast genes. Our data suggest that the distortion of chloroplast gene expression might be a feasible approach to manipulate the efficiency of photosynthesis in plants
Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
Bi2Se3 is one of a handful of known topological insulators. Here we show that
copper intercalation in the van der Waals gaps between the Bi2Se3 layers,
yielding an electron concentration of ~ 2 x 10^20cm-3, results in
superconductivity at 3.8 K in CuxBi2Se3 for x between 0.12 and 0.15. This
demonstrates that Cooper pairing is possible in Bi2Se3 at accessible
temperatures, with implications for study of the physics of topological
insulators and potential devices.Comment: 6 pages, 4 figure
Spectral signatures of many-body localization with interacting photons
Statistical mechanics is founded on the assumption that a system can reach
thermal equilibrium, regardless of the starting state. Interactions between
particles facilitate thermalization, but, can interacting systems always
equilibrate regardless of parameter values\,? The energy spectrum of a system
can answer this question and reveal the nature of the underlying phases.
However, most experimental techniques only indirectly probe the many-body
energy spectrum. Using a chain of nine superconducting qubits, we implement a
novel technique for directly resolving the energy levels of interacting
photons. We benchmark this method by capturing the intricate energy spectrum
predicted for 2D electrons in a magnetic field, the Hofstadter butterfly. By
increasing disorder, the spatial extent of energy eigenstates at the edge of
the energy band shrink, suggesting the formation of a mobility edge. At strong
disorder, the energy levels cease to repel one another and their statistics
approaches a Poisson distribution - the hallmark of transition from the
thermalized to the many-body localized phase. Our work introduces a new
many-body spectroscopy technique to study quantum phases of matter
Rolling quantum dice with a superconducting qubit
One of the key challenges in quantum information is coherently manipulating
the quantum state. However, it is an outstanding question whether control can
be realized with low error. Only gates from the Clifford group -- containing
, , and Hadamard gates -- have been characterized with high
accuracy. Here, we show how the Platonic solids enable implementing and
characterizing larger gate sets. We find that all gates can be implemented with
low error. The results fundamentally imply arbitrary manipulation of the
quantum state can be realized with high precision, providing new practical
possibilities for designing efficient quantum algorithms.Comment: 8 pages, 4 figures, including supplementary materia
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