Microring resonators(MRRs)are extensively utilized in photonic chips for generating quantum light sources and enabling high-efficiency nonlinear frequency conversion.However,conventional microrings are typically optim...Microring resonators(MRRs)are extensively utilized in photonic chips for generating quantum light sources and enabling high-efficiency nonlinear frequency conversion.However,conventional microrings are typically optimized for a single specific function,limiting their versatility in multifunctional applications.In this work,we propose a reconfigurable microring resonator architecture designed to accommodate diverse application requirements.By integrating a cascaded Mach–Zehnder interferometer(MZI)as the microring coupler,the design enables independent control of the quality factors for pump,signal and idler photons through two tunable phase shifters.This capability allows for dynamic tuning and optimization of critical performance parameters,including photon-pair generation rate(PGR),spectral purity and single photon heralding efficiency(HE).The proposed structure is implemented on a silicon photonic chip,and experimental results exhibit a wide range of tunability for these parameters,with excellent agreement with theoretical predictions.This flexible and multi-functional design offers a promising pathway for high-performance,highly integrated on-chip quantum information processing systems.展开更多
A fully connected quantum network with a wavelength division multiplexing architecture plays an increasingly pivotal role in quantum information technology.With such architecture,an entanglement-based network has been...A fully connected quantum network with a wavelength division multiplexing architecture plays an increasingly pivotal role in quantum information technology.With such architecture,an entanglement-based network has been demonstrated in which an entangled photon-pair source distributes quantum entanglement resources to many users.Despite these remarkable advances,the scalability of the architecture could be constrained by the finite spectrum resource,where&(N2)wavelength channels are needed to connect N users,thus impeding further progress in real-world scenarios.Here,we propose a scheme for the wavelength division multiplexing entanglement-based network using a state-multiplexing quantum light source.With a dual-pump configuration,the feasibility of our approach is demonstrated by generating state-multiplexing photon pairs at multiple wavelength channels with a silicon nitride microring resonator chip.In our demonstration,we establish a fully connected graph between four users with six wavelength channels—saving half of which without sacrificing functionality and performance of the secure communication.A total asymptotic secure key rate of 1946.9 bps is obtained by performing the BBM92 protocol with the distributed state.The network topology of our method has great potential for developing a scalable quantum network with significantly minimized infrastructure requirements.展开更多
Quantum key distribution(QKD)guarantees informationtheoretic security through the fundamental principles of quantum mechanics.As its matures,QKD networks have achieved long-distance deployment,showing significant adva...Quantum key distribution(QKD)guarantees informationtheoretic security through the fundamental principles of quantum mechanics.As its matures,QKD networks have achieved long-distance deployment,showing significant advancements in practical quantum-security communication infrastructure[1].When transitioning to large scale quantum communication networks with complicated topologies,conventional paradigms,which are based on point-to-point QKD links connected by trusted nodes,face technical challenges on achieving scalability and optimizing resource allocation.Quantum entanglements are important resources for quantum networks.展开更多
An optimized quantum network design is demonstrated by realizing a state-multiplexing quantum light source via a dual-excitation configuration technique.This approach optimizes the usage of the finite wavelength spect...An optimized quantum network design is demonstrated by realizing a state-multiplexing quantum light source via a dual-excitation configuration technique.This approach optimizes the usage of the finite wavelength spectrum,facilitating the efficient expansion of entanglement-based fully-connected quantum networks across multiple users.展开更多
Recent advances in quantum dots （QDs） for classical and non-classical light sources are presented. We have established metal organic chemical vapor deposition （MOCVD） technology for InAs-based QD lasers at 1.3 μm...Recent advances in quantum dots （QDs） for classical and non-classical light sources are presented. We have established metal organic chemical vapor deposition （MOCVD） technology for InAs-based QD lasers at 1.3 μm and achieved ultralow threshold in QD lasers with photonic crystal （PhC） nanocavity. In addition, single photon emitters at 1.55 μm, GaN-based single photon sources operating at 200 K, and high-Q PhC nanocavity have been demonstrated.展开更多
This review addresses ongoing discussions involving nanolaser experiments,particularly those related to thresholdless lasing or few-emitter devices.A quantum-optical(quantum-mechanical active medium and radiation fiel...This review addresses ongoing discussions involving nanolaser experiments,particularly those related to thresholdless lasing or few-emitter devices.A quantum-optical(quantum-mechanical active medium and radiation field)theory is used to examine the emission properties of nanolasers under different experimental configurations.The active medium is treated as inhomogeneously broadened semiconductor quantum dots embedded in a quantum well,where carriers are introduced via current injection.Comparisons are made between a conventional laser and a nanolaser with a spontaneous emission factor of unity,as well as a laser with only a few quantum dots providing the gain.It is found that the combined exploration of intensity,coherence time,photon autocorrelation function and carrier spectral hole burning can provide a unique and consistent picture of nanolasers in the new regimes of laser operation during the transition from thermal to coherent emission.Furthermore,by reducing the number of quantum dots in the optical cavity,a clear indication of non-classical photon statistics is observed before the single-quantum-dot limit is reached.展开更多
基金Project supported by the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0301500)the National Natural Science Foundation of China(Grant No.62105366)。
文摘Microring resonators(MRRs)are extensively utilized in photonic chips for generating quantum light sources and enabling high-efficiency nonlinear frequency conversion.However,conventional microrings are typically optimized for a single specific function,limiting their versatility in multifunctional applications.In this work,we propose a reconfigurable microring resonator architecture designed to accommodate diverse application requirements.By integrating a cascaded Mach–Zehnder interferometer(MZI)as the microring coupler,the design enables independent control of the quality factors for pump,signal and idler photons through two tunable phase shifters.This capability allows for dynamic tuning and optimization of critical performance parameters,including photon-pair generation rate(PGR),spectral purity and single photon heralding efficiency(HE).The proposed structure is implemented on a silicon photonic chip,and experimental results exhibit a wide range of tunability for these parameters,with excellent agreement with theoretical predictions.This flexible and multi-functional design offers a promising pathway for high-performance,highly integrated on-chip quantum information processing systems.
基金supported by Sichuan Science and Technology Program(Nos.2022YFSY0061,2022YFSY0062,2022YFSY0063,2023YFSY0062,2023YFSY0058,2023NSFSC0048)the National Natural Science Foundation of China(Nos.62475039,62405046,92365106,62105371)Innovation Program for Quantum Science and Technology(No.2021ZD0300701).
文摘A fully connected quantum network with a wavelength division multiplexing architecture plays an increasingly pivotal role in quantum information technology.With such architecture,an entanglement-based network has been demonstrated in which an entangled photon-pair source distributes quantum entanglement resources to many users.Despite these remarkable advances,the scalability of the architecture could be constrained by the finite spectrum resource,where&(N2)wavelength channels are needed to connect N users,thus impeding further progress in real-world scenarios.Here,we propose a scheme for the wavelength division multiplexing entanglement-based network using a state-multiplexing quantum light source.With a dual-pump configuration,the feasibility of our approach is demonstrated by generating state-multiplexing photon pairs at multiple wavelength channels with a silicon nitride microring resonator chip.In our demonstration,we establish a fully connected graph between four users with six wavelength channels—saving half of which without sacrificing functionality and performance of the secure communication.A total asymptotic secure key rate of 1946.9 bps is obtained by performing the BBM92 protocol with the distributed state.The network topology of our method has great potential for developing a scalable quantum network with significantly minimized infrastructure requirements.
文摘Quantum key distribution(QKD)guarantees informationtheoretic security through the fundamental principles of quantum mechanics.As its matures,QKD networks have achieved long-distance deployment,showing significant advancements in practical quantum-security communication infrastructure[1].When transitioning to large scale quantum communication networks with complicated topologies,conventional paradigms,which are based on point-to-point QKD links connected by trusted nodes,face technical challenges on achieving scalability and optimizing resource allocation.Quantum entanglements are important resources for quantum networks.
文摘An optimized quantum network design is demonstrated by realizing a state-multiplexing quantum light source via a dual-excitation configuration technique.This approach optimizes the usage of the finite wavelength spectrum,facilitating the efficient expansion of entanglement-based fully-connected quantum networks across multiple users.
基金Special Coordination Funds for Promoting Science and Technology
文摘Recent advances in quantum dots （QDs） for classical and non-classical light sources are presented. We have established metal organic chemical vapor deposition （MOCVD） technology for InAs-based QD lasers at 1.3 μm and achieved ultralow threshold in QD lasers with photonic crystal （PhC） nanocavity. In addition, single photon emitters at 1.55 μm, GaN-based single photon sources operating at 200 K, and high-Q PhC nanocavity have been demonstrated.
基金funded by the US Department of Energy,Office of Science,Office of Basic Energy Sciences.FJ and CG acknowledge financial support from the Deutsche Forschungsgemeinschaft.
文摘This review addresses ongoing discussions involving nanolaser experiments,particularly those related to thresholdless lasing or few-emitter devices.A quantum-optical(quantum-mechanical active medium and radiation field)theory is used to examine the emission properties of nanolasers under different experimental configurations.The active medium is treated as inhomogeneously broadened semiconductor quantum dots embedded in a quantum well,where carriers are introduced via current injection.Comparisons are made between a conventional laser and a nanolaser with a spontaneous emission factor of unity,as well as a laser with only a few quantum dots providing the gain.It is found that the combined exploration of intensity,coherence time,photon autocorrelation function and carrier spectral hole burning can provide a unique and consistent picture of nanolasers in the new regimes of laser operation during the transition from thermal to coherent emission.Furthermore,by reducing the number of quantum dots in the optical cavity,a clear indication of non-classical photon statistics is observed before the single-quantum-dot limit is reached.
