6,874 research outputs found
Robust interface between flying and topological qubits
Hybrid architectures, consisting of conventional and topological qubits, have
recently attracted much attention due to their capability in consolidating the
robustness of topological qubits and the universality of conventional qubits.
However, these two kinds of qubits are normally constructed in significantly
different energy scales, and thus this energy mismatch is a major obstacle for
their coupling that supports the exchange of quantum information between them.
Here, we propose a microwave photonic quantum bus for a direct strong coupling
between the topological and conventional qubits, in which the energy mismatch
is compensated by the external driving field via the fractional ac Josephson
effect. In the framework of tight-binding simulation and perturbation theory,
we show that the energy splitting of the topological qubits in a finite length
nanowire is still robust against local perturbations, which is ensured not only
by topology, but also by the particle-hole symmetry. Therefore, the present
scheme realizes a robust interface between the flying and topological qubits.
Finally, we demonstrate that this quantum bus can also be used to generate
multipartitie entangled states with the topological qubits.Comment: Accepted for publication in Scientific Report
Optimized Design on the Width and Spacing of the Cross Passageway in Tunnels
AbstractCross passageways have been commonly applied in the evacuation system of tunnels, and the width and spacing of the cross passageways decide the evacuation capacity of the tunnel. In design, increasing the width of the cross passageways and reducing their spacing can improve the evacuation ability of tunnels. However, it will certainly increase the cost of the project. Under the precondition of meeting evacuation requirements, an optimization model was established in this article, which aimed at reducing the cost of the project. Finally, discussions on the application of this optimization model were carried on, and this method may provide reference for designing cross passageways
Interactive Text-to-SQL Generation via Editable Step-by-Step Explanations
Relational databases play an important role in business, science, and more.
However, many users cannot fully unleash the analytical power of relational
databases, because they are not familiar with database languages such as SQL.
Many techniques have been proposed to automatically generate SQL from natural
language, but they suffer from two issues: (1) they still make many mistakes,
particularly for complex queries, and (2) they do not provide a flexible way
for non-expert users to validate and refine incorrect queries. To address these
issues, we introduce a new interaction mechanism that allows users to directly
edit a step-by-step explanation of a query to fix errors. Our experiments on
multiple datasets, as well as a user study with 24 participants, demonstrate
that our approach can achieve better performance than multiple SOTA approaches.
Our code and datasets are available at https://github.com/magic-YuanTian/STEPS.Comment: Accepted to EMNLP 202
Implementing universal nonadiabatic holonomic quantum gates with transmons
Geometric phases are well known to be noise-resilient in quantum
evolutions/operations. Holonomic quantum gates provide us with a robust way
towards universal quantum computation, as these quantum gates are actually
induced by nonabelian geometric phases. Here we propose and elaborate how to
efficiently implement universal nonadiabatic holonomic quantum gates on simpler
superconducting circuits, with a single transmon serving as a qubit. In our
proposal, an arbitrary single-qubit holonomic gate can be realized in a
single-loop scenario, by varying the amplitudes and phase difference of two
microwave fields resonantly coupled to a transmon, while nontrivial two-qubit
holonomic gates may be generated with a transmission-line resonator being
simultaneously coupled to the two target transmons in an effective resonant
way. Moreover, our scenario may readily be scaled up to a two-dimensional
lattice configuration, which is able to support large scalable quantum
computation, paving the way for practically implementing universal nonadiabatic
holonomic quantum computation with superconducting circuits.Comment: v3 Appendix added, v4 published version, v5 published version with
correction
Text Mining-Based Patent Analysis for Automated Rule Checking in AEC
Automated rule checking (ARC), which is expected to promote the efficiency of
the compliance checking process in the architecture, engineering, and
construction (AEC) industry, is gaining increasing attention. Throwing light on
the ARC application hotspots and forecasting its trends are useful to the
related research and drive innovations. Therefore, this study takes the patents
from the database of the Derwent Innovations Index database (DII) and China
national knowledge infrastructure (CNKI) as data sources and then carried out a
three-step analysis including (1) quantitative characteristics (i.e., annual
distribution analysis) of patents, (2) identification of ARC topics using a
latent Dirichlet allocation (LDA) and, (3) SNA-based co-occurrence analysis of
ARC topics. The results show that the research hotspots and trends of Chinese
and English patents are different. The contributions of this study have three
aspects: (1) an approach to a comprehensive analysis of patents by integrating
multiple text mining methods (i.e., SNA and LDA) is introduced ; (2) the
application hotspots and development trends of ARC are reviewed based on patent
analysis; and (3) a signpost for technological development and innovation of
ARC is provided
Microwave electrometry with multi-photon coherence in Rydberg atoms
A scheme for measurement of microwave (MW) electric field is proposed via
multi-photon coherence in Rydberg atoms. It is based on the three-photon
electromagnetically induced absorption (TPEIA) spectrum. In this process, the
multi-photon produces a narrow absorption peak, which has a larger magnitude
than the electromagnetically induced transparency (EIT) peak under the same
conditions. The TPEIA peak is sensitive to MW fields, and can be used to
measure MW electric field strength. It is interesting to find that the
magnitude of TPEIA peaks shows a linear relationship with the MW field
strength. The simulation results show that the minimum detectable strength of
the MW fields is about 1/10 that based on an common EIT effect, and the probe
sensitivity is improved by about 4 times. Furthermore, the MW sensing based on
three-photon coherence shows a broad tunability, and the scheme may be useful
for designing novel MW sensing devices.Comment: 6 pages,13 figure
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