The integrated optical true time delay phased array antenna system has the advantages of high bandwidth,small size,low loss and strong antiinterference capability,etc.The high integration of the optically controlled p...The integrated optical true time delay phased array antenna system has the advantages of high bandwidth,small size,low loss and strong antiinterference capability,etc.The high integration of the optically controlled phased array antenna system is a necessary trend for the future development of the phased array,and it is also a major focus and difficulty in the current research of integrated microwave photonics.This paper firstly introduces the basic principle and development history of optical true time delay phased array antenna system based on microwave photonics,and briefly introduces the main implementation methods and integration platform of optical true time delay.Then,the application and development prospect of optical true time delay technology in beam control of phased array antenna system are mainly presented.Finally,according to the current research progress,the possible research directions of integrated optically controlled phased array antenna systems in the future are proposed.展开更多
Scaling up spin qubits in silicon-based quantum dots is one of the pivotal challenges in achieving large-scale semiconductor quantum computation.To satisfy the connectivity requirements and reduce the lithographic com...Scaling up spin qubits in silicon-based quantum dots is one of the pivotal challenges in achieving large-scale semiconductor quantum computation.To satisfy the connectivity requirements and reduce the lithographic complexity,utilizing the qubit array structure and the circuit quantum electrodynamics(cQED)architecture together is expected to be a feasible scaling scheme.A triple-quantum dot(TQD)coupled with a superconducting resonator is regarded as a basic cell to demonstrate this extension scheme.In this article,we investigate a system consisting of a silicon TQD and a high-impedance TiN coplanar waveguide(CPW)resonator.The TQD can couple to the resonator via the right double-quantum dot(RDQD),which reaches the strong coupling regime with a charge–photon coupling strength of g0/(2p)=175 MHz.Moreover,we illustrate the high tunability of the TQD through the characterization of stability diagrams,quadruple points(QPs),and the quantum cellular automata(QCA)process.Our results contribute to fostering the exploration of silicon-based qubit integration.展开更多
Perovskite solar cells (PSCs) have achieved a record power conversion efficiency (PCE) of 27.0%[1],rivaling that of siliconbased solar cells while halving the cost,positioning them on the brink of commercialization [2...Perovskite solar cells (PSCs) have achieved a record power conversion efficiency (PCE) of 27.0%[1],rivaling that of siliconbased solar cells while halving the cost,positioning them on the brink of commercialization [2].However,a critical forthcoming challenge is the stability.While small-area PSCs have demonstrated a remarkably prolonged lifespan under constant indoor conditions [3,4],the environmental fluctuations (e.g.,illumination,temperature,etc.) encountered in the real-world applications [5,6],along with the scaling up of perovskite solar modules(PSMs)[7,8],have not been adequately addressed.As such,the long-term outdoor stability of industrial-scale PSMs is an urgent issue remains to be demonstrated.展开更多
基金supported by Fund of State Key Laboratory of IPOC(BUPT)(No.IPOC2021ZT16),China.
文摘The integrated optical true time delay phased array antenna system has the advantages of high bandwidth,small size,low loss and strong antiinterference capability,etc.The high integration of the optically controlled phased array antenna system is a necessary trend for the future development of the phased array,and it is also a major focus and difficulty in the current research of integrated microwave photonics.This paper firstly introduces the basic principle and development history of optical true time delay phased array antenna system based on microwave photonics,and briefly introduces the main implementation methods and integration platform of optical true time delay.Then,the application and development prospect of optical true time delay technology in beam control of phased array antenna system are mainly presented.Finally,according to the current research progress,the possible research directions of integrated optically controlled phased array antenna systems in the future are proposed.
基金the National Natural Science Foun-dation of China(Grant Nos.92265113,12074368,12304560,and 12034018)China Postdoctoral Science Foundation(Grant Nos.BX20220281 and 2023M733408).
文摘Scaling up spin qubits in silicon-based quantum dots is one of the pivotal challenges in achieving large-scale semiconductor quantum computation.To satisfy the connectivity requirements and reduce the lithographic complexity,utilizing the qubit array structure and the circuit quantum electrodynamics(cQED)architecture together is expected to be a feasible scaling scheme.A triple-quantum dot(TQD)coupled with a superconducting resonator is regarded as a basic cell to demonstrate this extension scheme.In this article,we investigate a system consisting of a silicon TQD and a high-impedance TiN coplanar waveguide(CPW)resonator.The TQD can couple to the resonator via the right double-quantum dot(RDQD),which reaches the strong coupling regime with a charge–photon coupling strength of g0/(2p)=175 MHz.Moreover,we illustrate the high tunability of the TQD through the characterization of stability diagrams,quadruple points(QPs),and the quantum cellular automata(QCA)process.Our results contribute to fostering the exploration of silicon-based qubit integration.
文摘Perovskite solar cells (PSCs) have achieved a record power conversion efficiency (PCE) of 27.0%[1],rivaling that of siliconbased solar cells while halving the cost,positioning them on the brink of commercialization [2].However,a critical forthcoming challenge is the stability.While small-area PSCs have demonstrated a remarkably prolonged lifespan under constant indoor conditions [3,4],the environmental fluctuations (e.g.,illumination,temperature,etc.) encountered in the real-world applications [5,6],along with the scaling up of perovskite solar modules(PSMs)[7,8],have not been adequately addressed.As such,the long-term outdoor stability of industrial-scale PSMs is an urgent issue remains to be demonstrated.
