As one promising way to solve the challenging issues of data sparsity and cold start in recommender systems, crossdomain recommendation has gained increasing research interest recently. Cross-domain recommendation aims to improve the recommendation performance by means of transferring explicit or implicit feedback from the auxiliary domain to the target domain. Although the side information of review texts and item contents has been proven to be useful in recommendation, most existing works only use one kind of side information and cannot deeply fuse this side information with ratings. In this paper, we propose a Review and Content based Deep Fusion Model named RC-DFM for crossdomain recommendation. We first extend Stacked Denoising Autoencoders (SDAE) to effectively fuse review texts and item contents with the rating matrix in both auxiliary and target domains. Through this way, the learned latent factors of users and items in both domains preserve more semantic information for recommendation. Then we utilize a multi-layer perceptron to transfer user latent factors between the two domains to address the data sparsity and cold start issues. Experimental results on real datasets demonstrate the superior performance of RC-DFM compared with state-of-the-art recommendation methods.Deeply Fusing Reviews and Contents for Cold Start Users in Cross-Domain Recommendation Systems
We propose two alternative entanglement concentration protocols (ECPs) using the Faraday rotation of photonic polarization. Through the single-photon input-output process in cavity QED, it is shown that the maximally entangled atomic (photonic) state can be extracted from two partially entangled states. The distinct feature of our protocols is that we can concentrate both atomic and photonic entangled states via photonic Faraday rotation, and thus they may be universal and useful for entanglement concentration in the experiment. Furthermore, as photonic Faraday rotation works in low-Q cavities and only involves virtual excitation of atoms, our ECPs are insensitive to both cavity decay and atomic spontaneous emission.PACS numbers: 03.67.-a, 03.67. Bg, 42.50.Dv Entanglement is the key resource in quantum information processing (QIP), such as quantum teleportation [1], quantum key distribution [2] and quantum dense coding [3]. In order to complete such QIP protocols perfectly, the maximally entangled states are usually required. However, the entanglement will inevitably degrade in the process of distribution and storage due to the interaction between system and its external environment. To overcome the dissipation and decoherence, Bennett et al. proposed the protocols of entanglement purification [4] and entanglement concentration [5]. By use of entanglement purification protocols (EPPs), one can distill a set of mixed entangled states into a subset of highly entangled states with local operation and classical communication [4]. However, EPPs can only improve the quality of the mixed state and can not get the maximally entangled state. On the other hand, entanglement concentration protocols (ECPs) [5] can be used to convert the partially entangled pairs to the maximally entangled ones. In the early days, many efforts have been devoted to photonic ECPs with linear [6,7] or nonlinear [8] optical elements. Recently, ECPs of solid state qubits (such as atomic [9][10][11] or electric qubits [12]) have also been investigated frequently.Cavity quantum electrodynamics (QED) system [13] is an excellent platform for understanding the fundamental principle of quantum mechanics and investigating QIP. In most of QIP protocols based on cavity QED, they usually require that atoms strongly interact with high-Q cavity field, which guarantees not only entanglement preparation but also further implementation of QIP tasks. However, as the high-Q cavity is well isolated from the environment, it seems unsuitable for efficiently accomplishing the input-output process of photons, which is the key step to implement long-distance QIP in a scalable fashion. Recently, An et al. [14] proposed a novel scheme to
In this work, using the Gaussian Process, we explore the potentiality of future gravitational wave (GW) measurement to probe cosmic opacity through comparing its opacity-free luminosity distance (LD) with the opacity-dependent one from type Ia supernovae (SNIa). GW data points are simulated from the third generation Einstein Telescope, and SNIa data are taken from the Joint Light Analysis (JLA) or Pantheon compilation. The advantages of using Gaussian Process are that one may match SNIa data with GW data at the same redshift and use all available data to probe cosmic opacity. We obtain that the error bar of the constraint on cosmic opacity can be reduced to σ ǫ ∼ 0.011 and 0.006 at 1σ confidence level (CL) for JLA and Pantheon respectively in a cosmological-independent way. Thus, the future GW measurements can give competitive results on the cosmic opacity test. Furthermore, we propose a method to probe the spatial homogeneity of the cosmic transparency through comparing the reconstructed LD from the mock GW with the reconstructed one from SNIa data in a flat ΛCDM with the Gaussian Process. The result shows that a transparent universe is favored at 1σ CL, although the best-fit value of cosmic opacity is redshift-dependent.
Exploring the properties and applications of topological quantum states is essential to better understand topological matter. Here, we theoretically study a quasi-one-dimensional topological atom array. In the low-energy regime, the atom array is equivalent to a topological superatom. Driving the superatom in a cavity, we study the interaction between light and topological quantum states. We find that the edge states exhibit topology-protected quantum coherence, which can be characterized from the photon transmission. This quantum coherence helps us to find a superradiance-subradiance transition, and we also study its finite-size scaling behavior. The superradiance-subradiance transition also exists in symmetry-breaking systems. More importantly, it is shown that the quantum coherence of the subradiant edge state is robust to random noises, allowing the superatom to work as a topologically protected quantum memory. We suggest a relevant experiment with three-dimensional circuit QED. Our study may have applications in quantum computation and quantum optics based on topological edge states.
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