2,549 research outputs found
Adaptive low rank and sparse decomposition of video using compressive sensing
We address the problem of reconstructing and analyzing surveillance videos
using compressive sensing. We develop a new method that performs video
reconstruction by low rank and sparse decomposition adaptively. Background
subtraction becomes part of the reconstruction. In our method, a background
model is used in which the background is learned adaptively as the compressive
measurements are processed. The adaptive method has low latency, and is more
robust than previous methods. We will present experimental results to
demonstrate the advantages of the proposed method.Comment: Accepted ICIP 201
Sharing Bell nonlocality of bipartite high-dimensional pure states using only projective measurements
Bell nonlocality is the key quantum resource in some device-independent
quantum information processing. It is of great importance to study the
efficient sharing of this resource. Unsharp measurements are widely used in
sharing the nonlocality of an entangled state shared among several sequential
observers. Recently, the authors in [Phys. Rev. Lett.129, 230402(2022)] showed
that the Bell nonlocality of two-qubit pure states can be shared even when one
only uses projective measurements and local randomness. We demonstrate that
projective measurements are also sufficient for sharing the Bell nonlocality of
arbitrary high-dimensional pure bipartite states. Our results promote further
understanding of the nonlocality sharing of high-dimensional quantum states
under projective measurements.Comment: 5 pages, 3 figure
System-environment dynamics of GHZ-like states in noninertial frames
Quantum coherence, quantum entanglement and quantum nonlocality are important
resources in quantum information precessing. However, decoherence happens when
a quantum system interacts with the external environments. We study the
dynamical evolution of the three-qubit GHZ-like states in non-inertial frame
when one and/or two qubits undergo decoherence. Under the amplitude damping
channel we show that the quantum decoherence and the Unruh effect may have
quite different influences on the initial state. Moreover, the genuine
tripartite entanglement and the quantum coherence may suffer sudden death
during the evolution. The quantum coherence is most resistent to the quantum
decoherence and the Unruh effect, then comes the quantum entanglement and the
quantum nonlocality which is most fragile among the three. The results provide
a new research perspective for relativistic quantum informatics.Comment: 9 pages,7 figure
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