Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits.The performance of these quantum devices heavily rel...Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits.The performance of these quantum devices heavily relies on the quality of the induced superconducting gap.A hard gap.展开更多
We study a gate-tunable superconducting qubit(gatemon) based on a thin InAs-Al hybrid nanowire.Using a gate voltage to control its Josephson energy,the gatemon can reach the strong coupling regime to a microwave cavit...We study a gate-tunable superconducting qubit(gatemon) based on a thin InAs-Al hybrid nanowire.Using a gate voltage to control its Josephson energy,the gatemon can reach the strong coupling regime to a microwave cavity.In the dispersive regime,we extract the energy relaxation time T_(1)~0.56 μs and the dephasing time T_(2)^(*)~0.38 μs.Since thin In As-Al nanowires can have fewer or single sub-band occupation and recent transport experiment shows the existence of nearly quantized zero-bias conductance peaks,our result holds relevancy for detecting Majorana zero modes in thin InAs-Al nanowires using circuit quantum electrodynamics.展开更多
Inspired by a recent experiment[Phys.Rev.Lett.122253201(2019)]that an unprecedented quantum interference was observed in the way of stimulated Raman adiabatic passage(STIRAP)due to the coexisting resonant-and detuned-...Inspired by a recent experiment[Phys.Rev.Lett.122253201(2019)]that an unprecedented quantum interference was observed in the way of stimulated Raman adiabatic passage(STIRAP)due to the coexisting resonant-and detuned-STIRAPs,we comprehensively study this effect.Our results uncover the scheme robustness towards any external-field fluctuations coming from laser intensity noise and imperfect resonance condition,as well as the persistence of high-contrast interference pattern even when more nearby excited levels are involved.We verify that an auxiliary dynamical phase accumulated in hold time caused by the presence of the quasi-dark state in detuned-STIRAP can sensitively manipulate the visibility and frequency of the interference pattern,representing a new hallmark to measure the hyperfine energy accurately.The robust stability of the scheme comes from the intrinsic superiority embedded in the STIRAP mechanism that preserves the coherence of population transfer,which promises a remarkable performance of quantum interference in a practical implementation.展开更多
Grasping the boundary of antibacterial function may be better for the sealing of soft tissue around dental implant abutment.Inspired by‘overdone is worse than undone’,we prepared a sandwich-structured dental implant...Grasping the boundary of antibacterial function may be better for the sealing of soft tissue around dental implant abutment.Inspired by‘overdone is worse than undone’,we prepared a sandwich-structured dental implant coating on the percutaneous part using graphene oxide(GO)wrapped under mineralized collagen.Our unique coating structure ensured the high photothermal conversion capability and good photothermal stability of GO.The prepared coating not only achieved suitable inhibition on colonizing bacteria growth of Streptococcus sanguinis,Fusobacterium nucleatum and Porphyromonas gingivalis but also disrupted the wall/membrane permeability of free bacteria.Further enhancements on the antibacterial property were generally observed through the additional incorporation of dimethylaminododecyl methacrylate.Additionally,the coating with sandwich structure significantly enhanced the adhesion,cytoskeleton organization and proliferation of human gingival fibroblasts,which was effective to improve soft tissue sealing.Furthermore,cell viability was preserved when cells and bacteria were cultivated in the same environment by a coculture assay.This was attributed to the sandwich structure and mineralized collagen as the outmost layer,which would protect tissue cells from photothermal therapy and GO,as well as accelerate the recovery of cell activity.Overall,the coating design would provide a useful alternative method for dental implant abutment surface modification and functionalization.展开更多
基金supported by Tsinghua University Initiative Scientific Research Programthe National Natural Science Foundation of China(Grant No.92065206)+1 种基金the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302400)the support from National Postdoctoral Researcher Program of China(Grant No.GZC20231368)。
文摘Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits.The performance of these quantum devices heavily relies on the quality of the induced superconducting gap.A hard gap.
基金supported by the Tsinghua University Initiative Scientific Research Programthe Alibaba Innovative Research Program+1 种基金the National Natural Science Foundation of China (Grant Nos.12204047,92065106,and 61974138)the support from Youth Innovation Promotion Association,Chinese Academy of Sciences (Grant Nos.2017156 and Y2021043)。
文摘We study a gate-tunable superconducting qubit(gatemon) based on a thin InAs-Al hybrid nanowire.Using a gate voltage to control its Josephson energy,the gatemon can reach the strong coupling regime to a microwave cavity.In the dispersive regime,we extract the energy relaxation time T_(1)~0.56 μs and the dephasing time T_(2)^(*)~0.38 μs.Since thin In As-Al nanowires can have fewer or single sub-band occupation and recent transport experiment shows the existence of nearly quantized zero-bias conductance peaks,our result holds relevancy for detecting Majorana zero modes in thin InAs-Al nanowires using circuit quantum electrodynamics.
基金the National Natural Science Foundation of China(Grant Nos.11474094 and 11104076)the Science and Technology Commission of Shanghai Municipality,China(Grant No.18ZR1412800).
文摘Inspired by a recent experiment[Phys.Rev.Lett.122253201(2019)]that an unprecedented quantum interference was observed in the way of stimulated Raman adiabatic passage(STIRAP)due to the coexisting resonant-and detuned-STIRAPs,we comprehensively study this effect.Our results uncover the scheme robustness towards any external-field fluctuations coming from laser intensity noise and imperfect resonance condition,as well as the persistence of high-contrast interference pattern even when more nearby excited levels are involved.We verify that an auxiliary dynamical phase accumulated in hold time caused by the presence of the quasi-dark state in detuned-STIRAP can sensitively manipulate the visibility and frequency of the interference pattern,representing a new hallmark to measure the hyperfine energy accurately.The robust stability of the scheme comes from the intrinsic superiority embedded in the STIRAP mechanism that preserves the coherence of population transfer,which promises a remarkable performance of quantum interference in a practical implementation.
基金supported by the National Natural Science Foundation of China(NSFC,No.31971265,31971257)the Project in the Science and Technology Support Program of Sichuan Province(No.2021YFSY0010).
文摘Grasping the boundary of antibacterial function may be better for the sealing of soft tissue around dental implant abutment.Inspired by‘overdone is worse than undone’,we prepared a sandwich-structured dental implant coating on the percutaneous part using graphene oxide(GO)wrapped under mineralized collagen.Our unique coating structure ensured the high photothermal conversion capability and good photothermal stability of GO.The prepared coating not only achieved suitable inhibition on colonizing bacteria growth of Streptococcus sanguinis,Fusobacterium nucleatum and Porphyromonas gingivalis but also disrupted the wall/membrane permeability of free bacteria.Further enhancements on the antibacterial property were generally observed through the additional incorporation of dimethylaminododecyl methacrylate.Additionally,the coating with sandwich structure significantly enhanced the adhesion,cytoskeleton organization and proliferation of human gingival fibroblasts,which was effective to improve soft tissue sealing.Furthermore,cell viability was preserved when cells and bacteria were cultivated in the same environment by a coculture assay.This was attributed to the sandwich structure and mineralized collagen as the outmost layer,which would protect tissue cells from photothermal therapy and GO,as well as accelerate the recovery of cell activity.Overall,the coating design would provide a useful alternative method for dental implant abutment surface modification and functionalization.