15,311 research outputs found
Holographic Storage of Biphoton Entanglement
Coherent and reversible storage of multi-photon entanglement with a multimode
quantum memory is essential for scalable all-optical quantum information
processing. Although single photon has been successfully stored in different
quantum systems, storage of multi-photon entanglement remains challenging
because of the critical requirement for coherent control of photonic
entanglement source, multimode quantum memory, and quantum interface between
them. Here we demonstrate a coherent and reversible storage of biphoton
Bell-type entanglement with a holographic multimode atomic-ensemble-based
quantum memory. The retrieved biphoton entanglement violates Bell's inequality
for 1 microsecond storage time and a memory-process fidelity of 98% is
demonstrated by quantum state tomography.Comment: 5 pages, 4 figures, accepted by Phys. Rev. Let
Learning Multiplex Embeddings on Text-rich Networks with One Text Encoder
In real-world scenarios, texts in a network are often linked by multiple
semantic relations (e.g., papers in an academic network are referenced by other
publications, written by the same author, or published in the same venue),
where text documents and their relations form a multiplex text-rich network.
Mainstream text representation learning methods use pretrained language models
(PLMs) to generate one embedding for each text unit, expecting that all types
of relations between texts can be captured by these single-view embeddings.
However, this presumption does not hold particularly in multiplex text-rich
networks. Along another line of work, multiplex graph neural networks (GNNs)
directly initialize node attributes as a feature vector for node representation
learning, but they cannot fully capture the semantics of the nodes' associated
texts. To bridge these gaps, we propose METERN, a new framework for learning
Multiplex Embeddings on TExt-Rich Networks. In contrast to existing methods,
METERN uses one text encoder to model the shared knowledge across relations and
leverages a small number of parameters per relation to derive relation-specific
representations. This allows the encoder to effectively capture the multiplex
structures in the network while also preserving parameter efficiency. We
conduct experiments on nine downstream tasks in five networks from both
academic and e-commerce domains, where METERN outperforms baselines
significantly and consistently. The code is available at
https://github.com/PeterGriffinJin/METERN-submit.Comment: 9 pages, 11 appendix page
No-compressing of quantum phase information
We raise a general question of quantum information theory whether the quantum
phase information can be compressed and retrieved. A general qubit contains
both amplitude and phase information, while an equatorial qubit contains only a
phase information. We study whether it is possible to compress the phase
information of n equatorial qubits into m general qubits with m being less than
n, and still those information can be retrieved perfectly. We prove that this
process is not allowed by quantum mechanics.Comment: 4 pages, 1 figur
DiffULD: Diffusive Universal Lesion Detection
Universal Lesion Detection (ULD) in computed tomography (CT) plays an
essential role in computer-aided diagnosis. Promising ULD results have been
reported by anchor-based detection designs, but they have inherent drawbacks
due to the use of anchors: i) Insufficient training targets and ii)
Difficulties in anchor design. Diffusion probability models (DPM) have
demonstrated outstanding capabilities in many vision tasks. Many DPM-based
approaches achieve great success in natural image object detection without
using anchors. But they are still ineffective for ULD due to the insufficient
training targets. In this paper, we propose a novel ULD method, DiffULD, which
utilizes DPM for lesion detection. To tackle the negative effect triggered by
insufficient targets, we introduce a novel center-aligned bounding box padding
strategy that provides additional high-quality training targets yet avoids
significant performance deterioration. DiffULD is inherently advanced in
locating lesions with diverse sizes and shapes since it can predict with
arbitrary boxes. Experiments on the benchmark dataset DeepLesion show the
superiority of DiffULD when compared to state-of-the-art ULD approaches
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