15,501 research outputs found
Topological crystalline protection in a photonic system
Topological crystalline insulators are a class of materials with a bulk
energy gap and edge or surface modes, which are protected by crystalline
symmetry, at their boundaries. They have been realized in electronic systems:
in particular, in SnTe. In this work, we propose a mechanism to realize
photonic boundary states topologically protected by crystalline symmetry. We
map this one-dimensional system to a two-dimensional lattice model with
opposite magnetic fields, as well as opposite Chern numbers in its even and odd
mirror parity subspaces, thus corresponding to a topological mirror insulator.
Furthermore, we test how sensitive and robust edge modes depend on their mirror
parity by performing time dependent evolution simulation of edge modes in a
photonic setting with realistic experimental parameters.Comment: 10 pages, 7 figure
Phase-space density in heavy-ion collisions revisited
We derive the phase space density of bosons from a general boson
interferometry formula.
We find that the phase space density is connected with the two-particles and
the single particle density distribution functions. If the boson density is
large, the two particles density distribution function can not be expressed as
a product of two single particle density distributions. However, if the boson
density is so small that two particles density distribution function can be
expressed as a product of two single particle density distributions, then
Bertsch's formula is recovered. For a Gaussian model, the effects of
multi-particles Bose-Einstein correlations on the mean phase space density are
studied.Comment: 18 Pages, Four eps files, EPJC in Pres
Semiquantum key distribution using entangled states
Recently, Boyer et al. presented a novel semiquantum key distribution
protocol [M. Boyer, D. Kenigsberg, and T. Mor, Phys. Rev. Lett. 99, 140501
(2007)], by using four quantum states, each of which is randomly prepared by Z
basis or X basis. Here we present a semiquantum key distribution protocol by
using entangled states in which quantum Alice shares a secret key with
classical Bob. We also show the protocol is secure against eavesdropping.Comment: 6 page
Two ultracold atoms in a completely anisotropic trap
As a limiting case of ultracold atoms trapped in deep optical lattices, we
consider two interacting atoms trapped in a general anisotropic harmonic
oscillator potential, and obtain exact solutions of the Schrodinger equation
for this system. The energy spectra for different geometries of the trapping
potential are compared.Comment: 4 pages, 2 figure
The Saccharomyces cerevisiae Mob2p-Cbk1p kinase complex promotes polarized growth and acts with the mitotic exit network to facilitate daughter cell-specific localization of Ace2p transcription factor.
The Saccharomyces cerevisiae mitotic exit network (MEN) is a conserved signaling network that coordinates events associated with the M to G1 transition. We investigated the function of two S. cerevisiae proteins related to the MEN proteins Mob1p and Dbf2p kinase. Previous work indicates that cells lacking the Dbf2p-related protein Cbk1p fail to sustain polarized growth during early bud morphogenesis and mating projection formation (Bidlingmaier, S., E.L. Weiss, C. Seidel, D.G. Drubin, and M. Snyder. 2001. Mol. Cell. Biol. 21:2449-2462). Cbk1p is also required for Ace2p-dependent transcription of genes involved in mother/daughter separation after cytokinesis. Here we show that the Mob1p-related protein Mob2p physically associates with Cbk1p kinase throughout the cell cycle and is required for full Cbk1p kinase activity, which is periodically activated during polarized growth and mitosis. Both Mob2p and Cbk1p localize interdependently to the bud cortex during polarized growth and to the bud neck and daughter cell nucleus during late mitosis. We found that Ace2p is restricted to daughter cell nuclei via a novel mechanism requiring Mob2p, Cbk1p, and a functional nuclear export pathway. Furthermore, nuclear localization of Mob2p and Ace2p does not occur in mob1-77 or cdc14-1 mutants, which are defective in MEN signaling, even when cell cycle arrest is bypassed. Collectively, these data indicate that Mob2p-Cbk1p functions to (a) maintain polarized cell growth, (b) prevent the nuclear export of Ace2p from the daughter cell nucleus after mitotic exit, and (c) coordinate Ace2p-dependent transcription with MEN activation. These findings may implicate related proteins in linking the regulation of cell morphology and cell cycle transitions with cell fate determination and development
Integrating Emotion Recognition with Speech Recognition and Speaker Diarisation for Conversations
Although automatic emotion recognition (AER) has recently drawn significant
research interest, most current AER studies use manually segmented utterances,
which are usually unavailable for dialogue systems. This paper proposes
integrating AER with automatic speech recognition (ASR) and speaker diarisation
(SD) in a jointly-trained system. Distinct output layers are built for four
sub-tasks including AER, ASR, voice activity detection and speaker
classification based on a shared encoder. Taking the audio of a conversation as
input, the integrated system finds all speech segments and transcribes the
corresponding emotion classes, word sequences, and speaker identities. Two
metrics are proposed to evaluate AER performance with automatic segmentation
based on time-weighted emotion and speaker classification errors. Results on
the IEMOCAP dataset show that the proposed system consistently outperforms two
baselines with separately trained single-task systems on AER, ASR and SD.Comment: Interspeech 202
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