The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the re...The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral coupling.We present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level.展开更多
A new metal-organic network, [Cd（CH_3OH）_2（epa）]_n（1）, was synthesized from an achiral coupled cinnamic acid, 3,3？-（（ethane-1,2-diylbis（oxy））bis（2,1-phenylene））diacrylic acid（H_2epa）, and Cd（NO3）2&#...A new metal-organic network, [Cd（CH_3OH）_2（epa）]_n（1）, was synthesized from an achiral coupled cinnamic acid, 3,3？-（（ethane-1,2-diylbis（oxy））bis（2,1-phenylene））diacrylic acid（H_2epa）, and Cd（NO3）2·4H2O under solvothermal conditions. The complex crystallizes in orthorhombic, space group P2_12_12 with a = 9.8286（8）, b = 21.0004（16）, c = 5.5169（4） A, V = 1138.71（15） A3, M_r = 528.81, D_c = 1.542 Mg/cm3, F（000） = 536, Z = 2, the final R = 0.0345 and wR = 0.1101 for 2006 observed reflections（I 〉 2σ（I））. In 1 the epa^（2＋） anions alternately bridge the Cd（II） cations to form a one-dimensional（1D） infinite homochiral helical chain of [Cd（epa）]n. The chiral homohelical chains via hydrogen bonds formed a two-dimensional（2D） network. The photoluminescence of 1 was also investigated in solid state at ambient temperature.展开更多
We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,an...We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,and the solution indicates the few-photon reflection and transmission properties.When inputting two photons of equal energy to resonate with the cavity,the propagation characteristics of the two photons will be interesting,which is different from the previous anti-bunching effects with a quantum emitter.More importantly,when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons,influence of the bound state will become larger to result in disappearance of antibunching effect.However,the bound state has no effect on probability of routing to another waveguide.展开更多
We propose a new mechanism to achieve nonreciprocal quantum entanglement in a cavity magnomechanical system by exploiting the chiral cavity-magnon coupling.The system consists of a magnon mode,a mechanical vibration m...We propose a new mechanism to achieve nonreciprocal quantum entanglement in a cavity magnomechanical system by exploiting the chiral cavity-magnon coupling.The system consists of a magnon mode,a mechanical vibration mode,and two degenerate counter-propagating microwave cavity modes in a torus-shaped cavity.We show that nonreciprocal stationary microwave-magnon and-phonon bipartite entanglements and photon-magnon-phonon tripartite entanglement can be achieved by respectively driving different circulating cavity modes that hold a chiral coupling to the magnon mode.The nonreciprocal entanglements are shown to be robust against various experimental imperfections.We specifically show how such nonreciprocal entanglement can realize the channel multiplexing quantum teleportation from a microwave field to a solidstate magnon mode.The work may find promising applications of the cavity magnomechanical systems in noise-tolerant quantum processing,channel multiplexing quantum teleportation,and chiral magnonic quantum networks.展开更多
Auxetic materials have been extensively studied for their design,fabrication and mechanical properties.These material systems exhibit unique mechanical characteristics such as high impact resistance,shear strength,and...Auxetic materials have been extensively studied for their design,fabrication and mechanical properties.These material systems exhibit unique mechanical characteristics such as high impact resistance,shear strength,and energy absorption capacity.Most existing auxetic materials are two-dimensional(2D)and demonstrate half-auxetic behavior,characterized by a negative Poisson's ratio when subjected to either tensile or compressive forces.Here,we present novel three-dimensional(3D)auxetic mechanical metamaterials,termed coupling chiral cuboids,capable of achieving negative Poisson's ratio under both tension and compression.We perform experiments,theoretical analysis,and numerical simulations to validate the wholly auxetic response of the proposed coupling chiral cuboids.Parametric studies are carried out to investigate the effects of structural parameters on the elastic modulus and Poisson's ratio of the coupling chiral cuboids.The results imply that the Poisson's ratio sign-switching from negative to positive can be implemented by manipulating the thickness of Z-shaped ligaments.Finally,the potential application of the coupling chiral cuboids as inner cores for impact-resistant sandwich panels is envisioned and validated.Test results demonstrate a remarkable 49.3%enhancement in energy absorption compared to conventional solidmaterials.展开更多
The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied ...The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied by a non-vanishing longitudinal resistance that is several k?.Meanwhile,the non-vanishing longitudinal resistance exhibits a universal exponential decay with the increase in magnetic field.We propose that the coupling of chiral edge states,which has not been properly evaluated in the previous theories,can give rise to the non-vanishing longitudinal resistance.The coupling between the chiral edges states along the opposite boundaries can be assisted by magnetic domains or defects inside the sample bulk,which has been already identified in recent experiments.Our theory provides a potential mechanism to understand the experimental result in both magnetic topological insulator and moirésuperlattice systems.展开更多
We propose a scheme to simultaneously achieve nonreciprocal unconventional and conventional photon blockade in a single photonic resonator based on the joint of chiral cavity-atom coupling and parametric amplification...We propose a scheme to simultaneously achieve nonreciprocal unconventional and conventional photon blockade in a single photonic resonator based on the joint of chiral cavity-atom coupling and parametric amplification,which significantly enhances the nonreciprocal photon blockade(NPB) and is termed universal NPB.We demonstrate that the nonreciprocal unconventional photon blockade dominates in weak coupling regime characterized by chiral and backscattering couplings smaller than decay rate when driving the device from one side but not from the other side,whereas the nonreciprocal unconventional and conventional photon blockades simultaneously account for the NPB in the strong coupling regime.This broadens the parameter space of realizing the NPB and demonstrates a stronger NPB in the strong coupling regime.Furthermore,the nonreciprocity can be improved by approximately three orders of magnitude due to the presence of the parametric amplification.Our findings pave the way for the development of quantum nonreciprocal devices,with potential applications in quantum information processing and chiral networks.展开更多
基金Supported by the Anhui Provincial Natural Science Foundation under Grant No 1608085MA09the National Natural Science Foundation of China under Grant Nos 11774262,61675006,11474003 and 61472282
文摘The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral coupling.We present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level.
基金supported by Scientific and Technological Research Program of Chongqing Municipal Education Commission(No.KJ100602,KJ130638)Program for Innovation Team Building at Institutions of Higher Education in Chongqing(KJTD201309)
文摘A new metal-organic network, [Cd（CH_3OH）_2（epa）]_n（1）, was synthesized from an achiral coupled cinnamic acid, 3,3？-（（ethane-1,2-diylbis（oxy））bis（2,1-phenylene））diacrylic acid（H_2epa）, and Cd（NO3）2·4H2O under solvothermal conditions. The complex crystallizes in orthorhombic, space group P2_12_12 with a = 9.8286（8）, b = 21.0004（16）, c = 5.5169（4） A, V = 1138.71（15） A3, M_r = 528.81, D_c = 1.542 Mg/cm3, F（000） = 536, Z = 2, the final R = 0.0345 and wR = 0.1101 for 2006 observed reflections（I 〉 2σ（I））. In 1 the epa^（2＋） anions alternately bridge the Cd（II） cations to form a one-dimensional（1D） infinite homochiral helical chain of [Cd（epa）]n. The chiral homohelical chains via hydrogen bonds formed a two-dimensional（2D） network. The photoluminescence of 1 was also investigated in solid state at ambient temperature.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11975095,12075082,and 11935006)the Science and Technology Innovation Program of Hunan Province,China(Grant No.2020RC4047)。
文摘We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,and the solution indicates the few-photon reflection and transmission properties.When inputting two photons of equal energy to resonate with the cavity,the propagation characteristics of the two photons will be interesting,which is different from the previous anti-bunching effects with a quantum emitter.More importantly,when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons,influence of the bound state will become larger to result in disappearance of antibunching effect.However,the bound state has no effect on probability of routing to another waveguide.
基金supported by National Key Research and Development Program of China(2022YFA1405200,2024YFA1408900)National Natural Science Foun-dation of China(12474365,92265202)Zhejiang Provincial Natural Science Foundation of China(LR25A050001).
文摘We propose a new mechanism to achieve nonreciprocal quantum entanglement in a cavity magnomechanical system by exploiting the chiral cavity-magnon coupling.The system consists of a magnon mode,a mechanical vibration mode,and two degenerate counter-propagating microwave cavity modes in a torus-shaped cavity.We show that nonreciprocal stationary microwave-magnon and-phonon bipartite entanglements and photon-magnon-phonon tripartite entanglement can be achieved by respectively driving different circulating cavity modes that hold a chiral coupling to the magnon mode.The nonreciprocal entanglements are shown to be robust against various experimental imperfections.We specifically show how such nonreciprocal entanglement can realize the channel multiplexing quantum teleportation from a microwave field to a solidstate magnon mode.The work may find promising applications of the cavity magnomechanical systems in noise-tolerant quantum processing,channel multiplexing quantum teleportation,and chiral magnonic quantum networks.
基金support of the National Key R&D Program of China(2023YFC3008100)the Startup Fund of the One-Hundred Talent Program at the Zhejiang University.A.H.A.acknowledges the support of the National Science Foundation(NSF)CAREER award(CMMI-2235494).
文摘Auxetic materials have been extensively studied for their design,fabrication and mechanical properties.These material systems exhibit unique mechanical characteristics such as high impact resistance,shear strength,and energy absorption capacity.Most existing auxetic materials are two-dimensional(2D)and demonstrate half-auxetic behavior,characterized by a negative Poisson's ratio when subjected to either tensile or compressive forces.Here,we present novel three-dimensional(3D)auxetic mechanical metamaterials,termed coupling chiral cuboids,capable of achieving negative Poisson's ratio under both tension and compression.We perform experiments,theoretical analysis,and numerical simulations to validate the wholly auxetic response of the proposed coupling chiral cuboids.Parametric studies are carried out to investigate the effects of structural parameters on the elastic modulus and Poisson's ratio of the coupling chiral cuboids.The results imply that the Poisson's ratio sign-switching from negative to positive can be implemented by manipulating the thickness of Z-shaped ligaments.Finally,the potential application of the coupling chiral cuboids as inner cores for impact-resistant sandwich panels is envisioned and validated.Test results demonstrate a remarkable 49.3%enhancement in energy absorption compared to conventional solidmaterials.
基金supported by the National Natural Science Foundation of China(Grant Nos.12074108,and 12147102)Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQ-MSX0568)+4 种基金supported by the National Natural Science Foundation of China(Grant No.12074107)the Program of Outstanding Young and Middle-aged Scientific and Technological Innovation Team of Colleges and Universities in Hubei Province(Grant No.T2020001)the Innovation Group Project of the Natural Science Foundation of Hubei Province of China(Grant No.2022CFA012)supported by the Würzburg-Dresden Cluster of Excellence ct.qmat,EXC2147(Grant No.390858490)the Deutsche Forschungsgemeinschaft(Grant No.SFB 1170)。
文摘The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied by a non-vanishing longitudinal resistance that is several k?.Meanwhile,the non-vanishing longitudinal resistance exhibits a universal exponential decay with the increase in magnetic field.We propose that the coupling of chiral edge states,which has not been properly evaluated in the previous theories,can give rise to the non-vanishing longitudinal resistance.The coupling between the chiral edges states along the opposite boundaries can be assisted by magnetic domains or defects inside the sample bulk,which has been already identified in recent experiments.Our theory provides a potential mechanism to understand the experimental result in both magnetic topological insulator and moirésuperlattice systems.
基金supported by the Natural Science Foundation of Jilin Province (Grant No.20240101013JC)the National Natural Science Foundation of China (Grant Nos.12375020,62475226,and 12074094)。
文摘We propose a scheme to simultaneously achieve nonreciprocal unconventional and conventional photon blockade in a single photonic resonator based on the joint of chiral cavity-atom coupling and parametric amplification,which significantly enhances the nonreciprocal photon blockade(NPB) and is termed universal NPB.We demonstrate that the nonreciprocal unconventional photon blockade dominates in weak coupling regime characterized by chiral and backscattering couplings smaller than decay rate when driving the device from one side but not from the other side,whereas the nonreciprocal unconventional and conventional photon blockades simultaneously account for the NPB in the strong coupling regime.This broadens the parameter space of realizing the NPB and demonstrates a stronger NPB in the strong coupling regime.Furthermore,the nonreciprocity can be improved by approximately three orders of magnitude due to the presence of the parametric amplification.Our findings pave the way for the development of quantum nonreciprocal devices,with potential applications in quantum information processing and chiral networks.
