1,610 research outputs found
Quantum-circuit guide to optical and atomic interferometry
Atomic (qubit) and optical or microwave (modal) phase-estimation protocols
are placed on the same footing in terms of quantum-circuit diagrams. Circuit
equivalences are used to demonstrate the equivalence of protocols that achieve
the Heisenberg limit by employing entangled superpositions of Fock states, such
as N00N states. The key equivalences are those that disentangle a circuit so
that phase information is written exclusively on a mode or modes or on a qubit.
The Fock-state-superposition phase-estimation circuits are converted to use
entangled coherent-state superpositions; the resulting protocols are more
amenable to realization in the lab, particularly in a qubit/cavity setting at
microwave frequencies.Comment: To appear in Optics Communications special issue in memory of
Krzysztof Wodkiewic
Dual Gaussian-based Variational Subspace Disentanglement for Visible-Infrared Person Re-Identification
Visible-infrared person re-identification (VI-ReID) is a challenging and
essential task in night-time intelligent surveillance systems. Except for the
intra-modality variance that RGB-RGB person re-identification mainly overcomes,
VI-ReID suffers from additional inter-modality variance caused by the inherent
heterogeneous gap. To solve the problem, we present a carefully designed dual
Gaussian-based variational auto-encoder (DG-VAE), which disentangles an
identity-discriminable and an identity-ambiguous cross-modality feature
subspace, following a mixture-of-Gaussians (MoG) prior and a standard Gaussian
distribution prior, respectively. Disentangling cross-modality
identity-discriminable features leads to more robust retrieval for VI-ReID. To
achieve efficient optimization like conventional VAE, we theoretically derive
two variational inference terms for the MoG prior under the supervised setting,
which not only restricts the identity-discriminable subspace so that the model
explicitly handles the cross-modality intra-identity variance, but also enables
the MoG distribution to avoid posterior collapse. Furthermore, we propose a
triplet swap reconstruction (TSR) strategy to promote the above disentangling
process. Extensive experiments demonstrate that our method outperforms
state-of-the-art methods on two VI-ReID datasets.Comment: Accepted by ACM MM 2020 poster. 12 pages, 10 appendixe
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