12,571 research outputs found
Attempt at Perfecting Non-Relativistic Quantum Mechanics Based on Interaction
Many wave phenomena are related to interactions. Considering once neglected
interactions in some cases, states of large objects and Newton's idea about
measurement, we attempt to modify some concepts and principles of
non-relativistic quantum mechanics. Our modifications may help one to
understand some typical quantum phenomena with near classical and intuitive
ideas without changing past correct results, may mediate some contradictions
logically, and then may partially perfect non-relativistic quantum mechanics.
We also give a review of the argument between Einstein and Bohr about
non-relativistic quantum mechanics simply based on interaction.Comment: 10 pages, no figur
New Understandings of Quantum Mechanics Based on Interaction
The interaction between two parts in a compound quantum system may be
reconsidered more completely than before and some new understandings and
conclusions different from current quantum mechanics are obtained, including
the conservation law in the evolution in an isolated quantum system, new
understandings of duality of particle and wave and the superposition principle
of states, three laws corresponding to Newton's laws, new understandings of
measurement and the uncertainty relation, arguments against the non-locality of
any entangled state and a simple criterion of coherence which is obtained for
the experimenter to examine the correctness of the non-locality. These may make
quantum mechanics be easily understood intuitively and some strange properties
will not appear.Comment: 9pages, no figure
Can we implement this quantum communication ?
Here I design an experimental way of a quantum communication by quantum CNOT
gates and single qubit gates without the help of classical communication.Comment: 5 pages, no figur
Super-pixel cloud detection using Hierarchical Fusion CNN
Cloud detection plays a very important role in the process of remote sensing
images. This paper designs a super-pixel level cloud detection method based on
convolutional neural network (CNN) and deep forest. Firstly, remote sensing
images are segmented into super-pixels through the combination of SLIC and
SEEDS. Structured forests is carried out to compute edge probability of each
pixel, based on which super-pixels are segmented more precisely. Segmented
super-pixels compose a super-pixel level remote sensing database. Though cloud
detection is essentially a binary classification problem, our database is
labeled into four categories: thick cloud, cirrus cloud, building and other
culture, to improve the generalization ability of our proposed models.
Secondly, super-pixel level database is used to train our cloud detection
models based on CNN and deep forest. Considering super-pixel level remote
sensing images contain less semantic information compared with general object
classification database, we propose a Hierarchical Fusion CNN (HFCNN). It takes
full advantage of low-level features like color and texture information and is
more applicable to cloud detection task. In test phase, every super-pixel in
remote sensing images is classified by our proposed models and then combined to
recover final binary mask by our proposed distance metric, which is used to
determine ambiguous super-pixels. Experimental results show that, compared with
conventional methods, HFCNN can achieve better precision and recall
SU(N) fractional quantum Hall effects in topological flat bands
We study -component interacting particles (hardcore bosons and fermions)
loaded in topological lattice models with SU-invariant interactions based
on density matrix renormalization group method. By tuning the interplay of
interspecies and intraspecies interactions, we demonstrate that a class of
SU fractional quantum Hall states can emerge at fractional filling factors
for bosons ( for fermions) in the lowest Chern
band, characterized by the nontrivial fractional Hall responses and the
fractional charge pumping. Moreover, we establish a topological
characterization based on the matrix, and discuss the close
relationship to the fractional quantum Hall physics in topological flat bands
with Chern number .Comment: 9 pages, 12 figure
Prethermal time crystals in a one-dimensional periodically driven Floquet system
Motivated by experimental observations of time-symmetry breaking behavior in
a periodically driven (Floquet) system, we study a one-dimensional spin model
to explore the stability of such Floquet discrete time crystals (DTCs) under
the interplay between interaction and the microwave driving. For intermediate
interactions and high drivings, from the time evolution of both stroboscopic
spin polarization and mutual information between two ends, we show that Floquet
DTCs can exist in a prethermal time regime without the tuning of strong
disorder. For much weak interactions the system is a symmetry-unbroken phase,
while for strong interactions it gives its way to a thermal phase. Through
analyzing the entanglement dynamics, we show that large driving fields protect
the prethermal DTCs from many-body localization and thermalization. Our results
suggest that by increasing the spin interaction, one can drive the experimental
system into optimal regime for observing a robust prethermal DTC phase.Comment: 8 pages, 9 figures; published versio
Topological characterization of hierarchical fractional quantum Hall effects in topological flat bands with SU() symmetry
We study the many-body ground states of SU() symmetric hardcore bosons on
the topological flat-band model by using controlled numerical calculations. By
introducing strong intracomponent and intercomponent interactions, we
demonstrate that a hierarchy of bosonic SU() fractional quantum Hall (FQH)
states emerges at fractional filling factors (odd ). In
order to characterize this series of FQH states, we figure the effective
matrix from the inverse of the Chern number matrix. The
topological characterization of the matrix also reveals quantized
drag Hall responses and fractional charge pumping that could be detected in
future experiments. In addition, we address the general one-to-one
correspondence to the spinless FQH states in topological flat bands with Chern
number at fillings .Comment: 7 pages, 6 figures. revised versio
Bosonic integer quantum Hall states in topological bands with Chern number two
We study the interacting bosons in topological Hofstadter bands with Chern
number two. Using exact diagonalization, we demonstrate that bosonic integer
quantum Hall (BIQH) state emerges at integer boson filling factor of
the lowest Chern band with evidences including a robust spectrum gap and
quantized topological Hall conductance two. Moreover, the robustness of BIQH
state against different interactions and next-nearest neighbor hopping is
investigated. The strong nearest neighbor interaction would favor a charge
density wave. When the onsite interaction decreases, BIQH state undergoes a
continuous transition into a superfluid state. Without next-nearest neighbor
hopping, the ground state is possibly in a metallic Fermi-liquid-like phase.Comment: 7 pages, 6 figures, References added and minor correctio
Preservation of quantum Fisher information and geometric phase of a single qubit system in a dissipative reservoir through the addition of qubits
In this paper, we have investigated the preservation of quantum Fisher
information of a single-qubit system coupled to a common zero temperature
reservoir through the addition of noninteracting qubits. The results show that,
the QFI is completely protected in both Markovian and non-Markovian regimes by
increasing the number of additional qubits. Besides, the phenomena of QFI
display monotonic decay or non-monotonic with revival oscillations depending on
the number of additional qubits in a common dissipative reservoir. Moreover, we
extend this model to investigate the effect of additional qubits N-1 and the
initial conditions of the system on the geometric phase. It is found that, the
robustness of GP against the dissipative reservoir has been demonstrated by
increasing gradually the number of additional qubits. Besides, the GP is
sensitive to the initial parameter theta, and possesses symmetric in a range
regime 0,2 pi.Comment: 6 pages, 5 figure
Fractional charge pumping of interacting bosons in one-dimensional superlattice
Motivated by experimental realizations of integer quantized charge pumping in
one-dimensional superlattices~[Nat. Phys. 12, 350 (2016); Nat. Phys. 12, 296
(2016)], we generalize and propose the adiabatic pumping of a fractionalized
charge in interacting bosonic systems. This is achieved by dynamically sweeping
the modulated potential in a class of one-dimensional interacting systems. As
concrete examples, we show the charge pumping of interacting bosons at certain
fractionally occupied fillings. We find that, for a given ground state, the
charge pumping in a complete potential cycle is quantized to the fractional
value related to the corresponding Chern number, characterized by the motion of
the charge polarization per site. Moreover, the difference between charge
polarizations of two ground states is quantized to an intrinsic constant
revealing the fractional elementary charge of quasiparticle.Comment: 8 pages,7 figures, revised manuscript; Accepted by Phys. Rev.
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