Steady Bell state generation via magnon-photon coupling

We show that parity-time ($\mathcal{PT}$) symmetry can be spontaneously broken in the recently reported energy level attraction of magnons and cavity photons. In the $\mathcal{PT}$-broken phase, magnon and photon form a high-fidelity Bell state with maximum entanglement. This entanglement is steady and robust against the perturbation of environment, in contrast to the general wisdom that expects instability of the hybridized state when the symmetry is broken. This anomaly is further understood by the compete of non-Hermitian evolution and particle number conservation of the hybridized system. As a comparison, neither $\mathcal{PT}$-symmetry broken nor steady magnon-photon entanglement is observed inside the normal level repulsion case. Our results may open a novel window to utilize magnon-photon entanglement as a resource for quantum technologies.Comment: 5 pages, 4 figure

Heavy- and light-flavor symmetry partners of the Tcc+(3875)T_{cc}^+(3875), the X(3872)X(3872) and the X(3960)X(3960) from light-meson exchange saturation

The spectrum of the charmed meson-(anti)meson system is a fundamental tool for disentangling the nature of a few exotic hadrons, including the recently discovered $T_{cc}^+(3875)$ tetraquark, the $X(3960)$, or the $X(3872)$, the nature of which is still not clear after almost two decades of its discovery. Here we consider that the charmed meson-(anti)meson short-range interaction is described by the exchange of light-mesons ($\sigma$, $\rho$, $\omega$). The effects of light-meson exchanges are recast into a simple contact-range theory by means of a saturation procedure, resulting in a compact description of the two-hadron interaction. From this, if the $T_{cc}^+$ were to be an isoscalar $D^* D$ molecule, then there should exist an isoscalar $J=1$ $D^* D^*$ partner, as constrained by heavy-quark spin symmetry. Yet, within our model, the most attractive two charmed meson configurations are the isovector $J=0$ $D^* D^*$ molecule and its sextet $D_s^* D^*$ and $D_s^* D_s^*$ flavor partners. Finally, we find a tension between the molecular descriptions of the $T_{cc}^+$ and that of the $X(3872)$ and $X(3960)$, where most parameter choices suggest that if the $T_{cc}^+$ is purely molecular then the $X(3872)$ overbinds (or conversely, if the $X(3872)$ is a molecule the $T_{cc}^+$ does not bind). This might be consequential for determining the nature of these states.Comment: 13 pages, 4 table

肾上腺素在膝关节镜手术中的应用

Objective: To explore the preparation method of epinephrine for knee arthroscopy, and to find the best temperature and concentration. Methods: A total of 60 cases of knee arthroscopy in our department, from September 2011 to January 2013, was divided into 6 groups. Condition for group A: low temperature (8℃), and low concentration (3000ml saline+0.5ml epinephrine); Group B:low temperature, but high concentration (3000ml saline+1ml epinephrine); Group C: normal temperature (23℃), and low concentration; Group D: normal temperature (23℃), and high concentration; Group E: heating (37℃),but low concentration; Group F: heating (37℃),and high concentration. Each group was used for the operation, and the effect of hemostasis and the changes of vital signs of the patients were observed during the operation. Results: The bleeding amounts in Group C and Group E were more than other groups, and the red blood cell counts increased significantly in the flushing fluid of the two groups. The effect of hemostasis in Group A, B, D and F was good. The patients in Group A, B, C, and D experienced a rapid rise or fall in temperature due to massive application of douching fluid. The patients in Group F didn’t experience much interference. Conclusion: The application of heating epinephrine imposes less interference to the patients’ vital signs during knee arthroscopy. Moreover, the effect of hemostasis is good, and the safety of the operation improved. It is worth to be popularized.目的  探讨膝关节镜手术中肾上腺素关节灌注液的配制方法，寻找最佳配制温度及浓度。方法  将我科2011年9月—2013年1月进行的60例膝关节镜手术随机分为6组：A组为低温（8℃）、低浓度组（3000ml生理盐水+0.5ml肾上腺素），B组为低温高浓度组（3000ml生理盐水+1ml肾上腺素），C组为常温（23℃）低浓度组，D组为常温高浓度组，E组为加温（37℃）低浓度组，F组为加温高浓度组，术中将各组分别于手术中灌注，观察患者术中的止血效果及患者生命体征的变化。结果  C组及E组患者术中出血较多，冲洗液中红细胞计数较其他组明显增加；A组、B组、D组、F组患者术中止血效果良好，术野清晰，但A组、B组、C组、D组患者因大量灌洗液的应用，患者体温均产生了不同程度的波动；F组对患者的生命体征干扰较少，效果良好。结论  膝关节镜手术中应用加温后的肾上腺素关节灌洗液对患者的生命体征干扰较少，术中止血效果好，提高了手术的安全性，值得推广

Interactive Speech and Noise Modeling for Speech Enhancement

Speech enhancement is challenging because of the diversity of background noise types. Most of the existing methods are focused on modelling the speech rather than the noise. In this paper, we propose a novel idea to model speech and noise simultaneously in a two-branch convolutional neural network, namely SN-Net. In SN-Net, the two branches predict speech and noise, respectively. Instead of information fusion only at the final output layer, interaction modules are introduced at several intermediate feature domains between the two branches to benefit each other. Such an interaction can leverage features learned from one branch to counteract the undesired part and restore the missing component of the other and thus enhance their discrimination capabilities. We also design a feature extraction module, namely residual-convolution-and-attention (RA), to capture the correlations along temporal and frequency dimensions for both the speech and the noises. Evaluations on public datasets show that the interaction module plays a key role in simultaneous modeling and the SN-Net outperforms the state-of-the-art by a large margin on various evaluation metrics. The proposed SN-Net also shows superior performance for speaker separation.Comment: AAAI 2021 (Accepted

The PψsΛ(4338)P_{\psi s}^{\Lambda}(4338) pentaquark and its partners in the molecular picture

The LHCb collaboration has detected a new hidden-charm pentaquark with the quantum numbers of a $\Lambda$ baryon: the $P_{\psi s}^{\Lambda}(4338)$. In the molecular picture this pentaquark will be interpreted as a $\bar{D} \Xi_c$ molecule. Here we briefly comment on the relation of the new $P_{\psi s}^{\Lambda}(4338)$ with the $P^{\Lambda}_{\psi s}(4459)$. We find that the $P_{\psi s}^{\Lambda}(4338)$ and $P_{\psi s}^{\Lambda}(4459)$ both accept a common molecular description in terms of the same parameters, which predicts the existence of a few additional $P_{\psi}^N$, $P_{\psi s}^{\Lambda}$, $P_{\psi s}^{\Sigma}$ and $P_{\psi s s}^{\Xi}$ pentaquarks composed of a charmed antimeson and an antitriplet charmed baryon. The most robust of these predicted pentaquarks is a $P_{\psi s}^{\Lambda}$ with a mass in the $(4235-4255)\,{\rm MeV}$ range, while other two interesting ones are a $P_{\psi}^{N}(4150)$ and a $P_{\psi}^{\Sigma}(4335)$, the later basically at the same mass as the $P_{\psi}^{\Lambda}(4338)$, with which it might mix owing to isospin symmetry breaking effects.Comment: 5 pages, 1 tabl