10,255 research outputs found
Renormalization of trace distance and multipartite entanglement close to the quantum phase transitions of one- and two-dimensional spin-chain systems
We investigate the quantum phase transitions of spin systems in one and two
dimensions by employing trace distance and multipartite entanglement along with
real-space quantum renormalization group method. As illustration examples, a
one-dimensional and a two-dimensional models are considered. It is shown
that the quantum phase transitions of these spin-chain systems can be revealed
by the singular behaviors of the first derivatives of renormalized trace
distance and multipartite entanglement in the thermodynamics limit. Moreover,
we find the renormalized trace distance and multipartite entanglement obey
certain universal exponential-type scaling laws in the vicinity of the quantum
critical points
Negative refraction index of the quantum lossy left-handed transmission lines affected by the displaced squeezed Fock state and dissipation
Quantum lossy left-handed transmission lines (LHTLs) are central to the
miniaturized application in microwave band. This work discusses the NRI of the
quantized lossy LHTLs in the presence of the resistance and the conductance in
a displaced squeezed Fock state (DSFS). And the results show some novel
specific quantum characteristics of NRI caused by the DSFS and dissipation,
which may be significant for its miniaturized application in a suit of novel
microwave devices.Comment: 11 pages,5 figure
Practical Block-wise Neural Network Architecture Generation
Convolutional neural networks have gained a remarkable success in computer
vision. However, most usable network architectures are hand-crafted and usually
require expertise and elaborate design. In this paper, we provide a block-wise
network generation pipeline called BlockQNN which automatically builds
high-performance networks using the Q-Learning paradigm with epsilon-greedy
exploration strategy. The optimal network block is constructed by the learning
agent which is trained sequentially to choose component layers. We stack the
block to construct the whole auto-generated network. To accelerate the
generation process, we also propose a distributed asynchronous framework and an
early stop strategy. The block-wise generation brings unique advantages: (1) it
performs competitive results in comparison to the hand-crafted state-of-the-art
networks on image classification, additionally, the best network generated by
BlockQNN achieves 3.54% top-1 error rate on CIFAR-10 which beats all existing
auto-generate networks. (2) in the meanwhile, it offers tremendous reduction of
the search space in designing networks which only spends 3 days with 32 GPUs,
and (3) moreover, it has strong generalizability that the network built on
CIFAR also performs well on a larger-scale ImageNet dataset.Comment: Accepted to CVPR 201
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