813 research outputs found
An entanglement measure for n-qubits
Recently, Coffman, Kundu, and Wootters introduced the residual entanglement
for three qubits to quantify the three-qubit entanglement in Phys. Rev. A 61,
052306 (2000). In Phys. Rev. A 65, 032304 (2007), we defined the residual
entanglement for qubits, whose values are between 0 and 1. In this paper,
we want to show that the residual entanglement for qubits is a natural
measure of entanglement by demonstrating the following properties. (1). It is
SL-invariant, especially LU-invariant. (2). It is an entanglement monotone.
(3). It is invariant under permutations of the qubits. (4). It vanishes or is
multiplicative for product states.Comment: 16 pages, no figure
SLOCC invariant and semi-invariants for SLOCC classification of four-qubits
We show there are at least 28 distinct true SLOCC entanglement classes for
four-qubits by means of SLOCC invariant and semi-invariants and derive the
number of the degenerated SLOCC classes for n-qubits.Comment: 22 pages, no figures, 9 tables, submit the paper to a journa
Masked Image Residual Learning for Scaling Deeper Vision Transformers
Deeper Vision Transformers (ViTs) are more challenging to train. We expose a
degradation problem in deeper layers of ViT when using masked image modeling
(MIM) for pre-training. To ease the training of deeper ViTs, we introduce a
self-supervised learning framework called Masked Image Residual Learning
(MIRL), which significantly alleviates the degradation problem, making scaling
ViT along depth a promising direction for performance upgrade. We reformulate
the pre-training objective for deeper layers of ViT as learning to recover the
residual of the masked image. We provide extensive empirical evidence showing
that deeper ViTs can be effectively optimized using MIRL and easily gain
accuracy from increased depth. With the same level of computational complexity
as ViT-Base and ViT-Large, we instantiate 4.5 and 2 deeper
ViTs, dubbed ViT-S-54 and ViT-B-48. The deeper ViT-S-54, costing 3 less
than ViT-Large, achieves performance on par with ViT-Large. ViT-B-48 achieves
86.2% top-1 accuracy on ImageNet. On one hand, deeper ViTs pre-trained with
MIRL exhibit excellent generalization capabilities on downstream tasks, such as
object detection and semantic segmentation. On the other hand, MIRL
demonstrates high pre-training efficiency. With less pre-training time, MIRL
yields competitive performance compared to other approaches
No-cloning of nonorthogonal states does not require inner product preserving
The no-cloning theorem says there is no quantum copy machine which can copy any one-qubit state. Inner product preserving was always used to prove the no-cloning of nonorthogonal states. In this paper we show that the no-cloning of nonorthogonal states does not require inner product preserving and discuss the minimal properties which a linear operator possesses to copy two different states at the same device. In this paper, we obtain the following necessary and sufficient condition. For any two different states ∣ψ〉 = a∣0〉+b∣1〉∣ψ〉=a∣0〉+b∣1〉 and ∣ϕ〉 = c∣0〉+d∣1〉∣ϕ〉=c∣0〉+d∣1〉, assume that a linear operator LL can copy them, that is, L(∣ψ,0〉) = ∣ψ,ψ〉L(∣ψ,0〉)=∣ψ,ψ〉 and L(∣ϕ,0〉) = ∣ϕ,ϕ〉L(∣ϕ,0〉)=∣ϕ,ϕ〉. Then the two states are orthogonal if and only if L(∣0,0〉)L(∣0,0〉) and L(∣1,0〉)L(∣1,0〉) are unit length states. Thus we only need linearity and that L(∣0,0〉)L(∣0,0〉) and L(∣1,0〉)L(∣1,0〉) are unit length states to prove the no-cloning of nonorthogonal states. It implies that inner product preserving is not necessary for the no-cloning of nonorthogonal states.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87751/2/082102_1.pd
Fixed-point Quantum Search for Different Phase Shifts
Grover recently presented the fixed-point search algorithm. In this letter,
we study the fixed-point search algorithm obtained by replacing equal phase
shifts of by different phase shifts.Comment: 8 page
UNIDEAL: Curriculum Knowledge Distillation Federated Learning
Federated Learning (FL) has emerged as a promising approach to enable
collaborative learning among multiple clients while preserving data privacy.
However, cross-domain FL tasks, where clients possess data from different
domains or distributions, remain a challenging problem due to the inherent
heterogeneity. In this paper, we present UNIDEAL, a novel FL algorithm
specifically designed to tackle the challenges of cross-domain scenarios and
heterogeneous model architectures. The proposed method introduces Adjustable
Teacher-Student Mutual Evaluation Curriculum Learning, which significantly
enhances the effectiveness of knowledge distillation in FL settings. We conduct
extensive experiments on various datasets, comparing UNIDEAL with
state-of-the-art baselines. Our results demonstrate that UNIDEAL achieves
superior performance in terms of both model accuracy and communication
efficiency. Additionally, we provide a convergence analysis of the algorithm,
showing a convergence rate of O(1/T) under non-convex conditions.Comment: Submitted to ICASSP 202
Task Indicating Transformer for Task-conditional Dense Predictions
The task-conditional model is a distinctive stream for efficient multi-task
learning. Existing works encounter a critical limitation in learning
task-agnostic and task-specific representations, primarily due to shortcomings
in global context modeling arising from CNN-based architectures, as well as a
deficiency in multi-scale feature interaction within the decoder. In this
paper, we introduce a novel task-conditional framework called Task Indicating
Transformer (TIT) to tackle this challenge. Our approach designs a Mix Task
Adapter module within the transformer block, which incorporates a Task
Indicating Matrix through matrix decomposition, thereby enhancing long-range
dependency modeling and parameter-efficient feature adaptation by capturing
intra- and inter-task features. Moreover, we propose a Task Gate Decoder module
that harnesses a Task Indicating Vector and gating mechanism to facilitate
adaptive multi-scale feature refinement guided by task embeddings. Experiments
on two public multi-task dense prediction benchmarks, NYUD-v2 and
PASCAL-Context, demonstrate that our approach surpasses state-of-the-art
task-conditional methods.Comment: Accepted by ICASSP 202
The Simple Criteria of SLOCC Equivalence Classes
We put forward an alternative approach to the SLOCC classification of
entanglement states of three-qubit and four-qubit systems. By directly solving
matrix equations, we obtain the relations satisfied by the amplitudes of
states. The relations are readily tested since in them only addition,
subtraction and multiplication occur.Comment: The original version was submitted to PRA in Feb. 2005, the paper No.
is AA10020. 14 pages for the present version. No figure
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