Rabi Spectroscopy of Super-Bloch Oscillations in Optical Lattice Clock

Super-Bloch oscillations(SBOs) is giant Bloch oscillations (BOs) when applying both static and periodically driving force to free atoms in lattice at the condition that Bloch oscillations are close to integer times of driving frequencies. Rather than observe SBOs in real space, this paper presents a method to observe it using Rabi spectroscopy of Optical lattice clock(OLC). An effective model of OLC with atoms been added both static and time-periodical forces is derived. Based on that, we propose an experimental scheme and give the Rabi spectrum under lab achievable parameters. Utilizing the precision spectroscopy of OLC, force with a large range could be accurately measured by measuring the Period of SBOs. We also gave the best parameter condition of measuring gravity by calculating Fisher information. Our work paves the way to study other exotic dynamics behaviors in Floquet driving OLC

Karakterizacija i antioksidativna svojstva hidrolizata proteina konoplje dobivenih pomoću enzima Neutrase®

Hemp protein hydrolysates with various yields of trichloroacetic acid (TCA)-soluble peptides (Ysp) and surface hydrophobicity (Ho) were obtained by Neutrase® hydrolysis from hemp protein isolate (HPI). The peptide profiles, amino acid composition and antioxidant activities (DPPH radical scavenging ability, reducing power and Fe2+ chelating ability) of the hydrolysates, obtained at 60–240 min, were evaluated. Higher DPPH radical scavenging (IC50, 2.3–2.4 mg/mL) and Fe2+ chelating (IC50, 1.7–1.8 mg/mL) abilities were observed for the hydrolysates with Ysp in the range of 28–30 and 18–28 %, respectively, while the high reducing power was only observed for the hydrolysate with Ysp of 18 %. The DPPH radical scavenging and Fe2+ chelating abilities were closely correlated with the peptide profiles and Ho of the hydrolysates. The peptide profiles of the hydrolysates with higher hydrophobic amino acids exhibited higher DPPH radical scavenging and Fe2+ chelating abilities.Hidrolizom izolata proteina pomoću enzima Neutrase® dobiveni su hidrolizati proteina konoplje s različitim prinosom peptida topljivih u trikloroctenoj kiselini (Ysp) i hidrofobnošću površine (Ho). Ispitan je peptidni profil, sastav aminokiselina i antioksidativna aktivnost (sposobnost uklanjanja DPPH radikala, reducirajuća snaga i sposobnost stvaranja helata Fe2+) hidrolizata dobivenih nakon 60-240 min. Uočena je veća sposobnost hidrolizata s Ysp=28-30 % da uklone DPPH radikale (IC50; 2,3-2,4 mg/mL), te veća mogućnost stvaranja helata Fe2+ s hidrolizatima vrijednosti Ysp=18-28 % (IC50; 1,7-1,8 mg/mL). Velika je reducirajuća snaga samo u hidrolizata s Ysp=18 %. Sposobnost uklanjanja DPPH radikala i stvaranja helata Fe2+ povezana je s peptidnim profilom i hidrofobnošću površine hidrolizata (Ho). Hidrolizati s većim udjelom hidrofobnih aminokiselina pokazali su bolju sposobnost uklanjanja DPPH radikala i stvaranja helata Fe2

Full-heavy tetraquark states and their evidences in the LHCb di-J/ψJ/\psi spectrum

In the framework of a nonrelativistic potential quark model (NRPQM) for heavy quark system, we investigate the mass spectrum of the $P$-wave tetraquark states of $cc\bar{c}\bar{c}$ and $bb\bar{b}\bar{b}$. The Hamiltonian contains a linear confinement potential and parameterized one-gluon-exchange potential which includes a Coulomb type potential and spin-dependent potentials. The full-heavy tetraquark system is solved by a harmonic oscillator expansion method. With the same parameters fixed by the charmonium and bottomonium spectra, we obtained the full spectra for the $S$ and $P$-wave heavy tetraquark states. We find that the narrow structure around 6.9 GeV recently observed at LHCb in the di-$J/\psi$ invariant mass spectrum can be naturally explained by the $P$-wave $cc\bar{c}\bar{c}$ states. Meanwhile, the observed broad structure around $6.2\sim 6.8$ GeV can be consistently explained by the $S$-wave states around 6.5 GeV predicted in our previous work. Some contributions from those suppressed low-lying $P$-wave states around 6.7 GeV are also possible. Other decay channels are implied in such a scenario and they can be investigated by future experimental analysis. Considering the large discovery potential at LHCb, we give our predictions of the $P$-wave $bb\bar{b}\bar{b}$ states which can be searched for in the future.Comment: 5 page, 1 figur

Quantum interface between frequency-uncorrelated down-converted entanglement and atomic-ensemble quantum memory

Photonic entanglement source and quantum memory are two basic building blocks of linear-optical quantum computation and long-distance quantum communication. In the past decades, intensive researches have been carried out, and remarkable progress, particularly based on the spontaneous parametric down-converted (SPDC) entanglement source and atomic ensembles, has been achieved. Currently, an important task towards scalable quantum information processing (QIP) is to efficiently write and read entanglement generated from a SPDC source into and out of an atomic quantum memory. Here we report the first experimental realization of a quantum interface by building a 5 MHz frequency-uncorrelated SPDC source and reversibly mapping the generated entangled photons into and out of a remote optically thick cold atomic memory using electromagnetically induced transparency. The frequency correlation between the entangled photons is almost fully eliminated with a suitable pump pulse. The storage of a triggered single photon with arbitrary polarization is shown to reach an average fidelity of 92% for 200 ns storage time. Moreover, polarization-entangled photon pairs are prepared, and one of photons is stored in the atomic memory while the other keeps flying. The CHSH Bell's inequality is measured and violation is clearly observed for storage time up to 1 microsecond. This demonstrates the entanglement is stored and survives during the storage. Our work establishes a crucial element to implement scalable all-optical QIP, and thus presents a substantial progress in quantum information science.Comment: 28 pages, 4 figures, 1 tabl

QoS-aware User Association and Transmission Scheduling for Millimeter-Wave Train-ground Communications

With the development of wireless communication, people have put forward higher requirements for train-ground communications in the high-speed railway (HSR) scenarios. With the help of mobile relays (MRs) installed on the roof of the train, the application of Millimeter-Wave (mm-wave) communication which has rich spectrum resources to the train-ground communication system can realize high data rate, so as to meet users' increasing demand for broad-band multimedia access. Also, full-duplex (FD) technology can theoretically double the spectral efficiency. In this paper, we formulate the user association and transmission scheduling problem in the mm-wave train-ground communication system with MR operating in the FD mode as a nonlinear programming problem. In order to maximize the system throughput and the number of users meeting quality of service (QoS) requirements, we propose an algorithm based on coalition game to solve the challenging NP-hard problem, and also prove the convergence and Nash-stable structure of the proposed algorithm. Extensive simulation results demonstrate that the proposed coalition game based algorithm can effectively improve the system throughput and meet the QoS requirements of as many users as possible, so that the communication system has a certain QoS awareness.Comment: 14 page

Karakterizacija i antioksidativna svojstva hidrolizata proteina konoplje dobivenih pomoću enzima Neutrase®

Hemp protein hydrolysates with various yields of trichloroacetic acid (TCA)-soluble peptides (Ysp) and surface hydrophobicity (Ho) were obtained by Neutrase® hydrolysis from hemp protein isolate (HPI). The peptide profiles, amino acid composition and antioxidant activities (DPPH radical scavenging ability, reducing power and Fe2+ chelating ability) of the hydrolysates, obtained at 60–240 min, were evaluated. Higher DPPH radical scavenging (IC50, 2.3–2.4 mg/mL) and Fe2+ chelating (IC50, 1.7–1.8 mg/mL) abilities were observed for the hydrolysates with Ysp in the range of 28–30 and 18–28 %, respectively, while the high reducing power was only observed for the hydrolysate with Ysp of 18 %. The DPPH radical scavenging and Fe2+ chelating abilities were closely correlated with the peptide profiles and Ho of the hydrolysates. The peptide profiles of the hydrolysates with higher hydrophobic amino acids exhibited higher DPPH radical scavenging and Fe2+ chelating abilities.Hidrolizom izolata proteina pomoću enzima Neutrase® dobiveni su hidrolizati proteina konoplje s različitim prinosom peptida topljivih u trikloroctenoj kiselini (Ysp) i hidrofobnošću površine (Ho). Ispitan je peptidni profil, sastav aminokiselina i antioksidativna aktivnost (sposobnost uklanjanja DPPH radikala, reducirajuća snaga i sposobnost stvaranja helata Fe2+) hidrolizata dobivenih nakon 60-240 min. Uočena je veća sposobnost hidrolizata s Ysp=28-30 % da uklone DPPH radikale (IC50; 2,3-2,4 mg/mL), te veća mogućnost stvaranja helata Fe2+ s hidrolizatima vrijednosti Ysp=18-28 % (IC50; 1,7-1,8 mg/mL). Velika je reducirajuća snaga samo u hidrolizata s Ysp=18 %. Sposobnost uklanjanja DPPH radikala i stvaranja helata Fe2+ povezana je s peptidnim profilom i hidrofobnošću površine hidrolizata (Ho). Hidrolizati s većim udjelom hidrofobnih aminokiselina pokazali su bolju sposobnost uklanjanja DPPH radikala i stvaranja helata Fe2