2,327 research outputs found
Reversing the Weak Quantum Measurement for a Photonic Qubit
We demonstrate the conditional reversal of a weak (partial-collapse) quantum
measurement on a photonic qubit. The weak quantum measurement causes a
nonunitary transformation of a qubit which is subsequently reversed to the
original state after a successful reversing operation. Both the weak
measurement and the reversal operation are implemented linear optically. The
state recovery fidelity, determined by quantum process tomography, is shown to
be over 94% for partial-collapse strength up to 0.9. We also experimentally
study information gain due to the weak measurement and discuss the role of the
reversing operation as an information erasure
Perception-Oriented Single Image Super-Resolution using Optimal Objective Estimation
Single-image super-resolution (SISR) networks trained with perceptual and
adversarial losses provide high-contrast outputs compared to those of networks
trained with distortion-oriented losses, such as L1 or L2. However, it has been
shown that using a single perceptual loss is insufficient for accurately
restoring locally varying diverse shapes in images, often generating
undesirable artifacts or unnatural details. For this reason, combinations of
various losses, such as perceptual, adversarial, and distortion losses, have
been attempted, yet it remains challenging to find optimal combinations. Hence,
in this paper, we propose a new SISR framework that applies optimal objectives
for each region to generate plausible results in overall areas of
high-resolution outputs. Specifically, the framework comprises two models: a
predictive model that infers an optimal objective map for a given
low-resolution (LR) input and a generative model that applies a target
objective map to produce the corresponding SR output. The generative model is
trained over our proposed objective trajectory representing a set of essential
objectives, which enables the single network to learn various SR results
corresponding to combined losses on the trajectory. The predictive model is
trained using pairs of LR images and corresponding optimal objective maps
searched from the objective trajectory. Experimental results on five benchmarks
show that the proposed method outperforms state-of-the-art perception-driven SR
methods in LPIPS, DISTS, PSNR, and SSIM metrics. The visual results also
demonstrate the superiority of our method in perception-oriented
reconstruction. The code and models are available at
https://github.com/seungho-snu/SROOE.Comment: Code and trained models will be available at
https://github.com/seungho-snu/SROO
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