Photonics has proven to be a very attractive platform for quantum technologies,offering key features such as high-fidelity qubits and room-temperature signal processing.Advancements in integrated photonics are expecte...Photonics has proven to be a very attractive platform for quantum technologies,offering key features such as high-fidelity qubits and room-temperature signal processing.Advancements in integrated photonics are expected to further enhance these capabilities as the technology evolves from few-photon architectures to systems capable of generating and processing tens,possibly hundreds,of photons,marking critical progress toward scalable quantum information processing.Although each integrated platform has its own unique advantages and limitations,thin-film lithium niobate(TFLN)photonics has recently emerged as a strong contender thanks to its low-loss characteristics,large electro-optic and nonlinear coefficients,broad transparency window,and ultra-fast modulation capabilities.In this review,we examine the latest developments in TFLN quantum photonics and identify promising directions and challenges for future research in this field.展开更多
In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with ...In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with Purcell enhancement),interconnectivity with spin qubits,and a scalable on-chip platform.However,in the past two decades,the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50%,and the distances were limited from a few meters to kilometers.Here,we report quantum interference between two single photons from independent QDs separated by a 302 km optical fiber.The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities.Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band.The observed interference visibility is 0.670.02(0.930.04)without(with)temporal filtering.Feasible improvements can further extend the distance to∼600 km.Our work represents a key step to long-distance solid-state quantum networks.展开更多
基金the Villum Fonden Young Investigator project(QUANPIC,Ref.00025298)the NQCP(Novo Nordic Foundation Quantum Computing Programme)the Danish National Research Foundation(DRNF)Research Centre of Excellence,SPOC(Silicon Photonics for Optical Communications)(Ref.DNRF123)。
文摘Photonics has proven to be a very attractive platform for quantum technologies,offering key features such as high-fidelity qubits and room-temperature signal processing.Advancements in integrated photonics are expected to further enhance these capabilities as the technology evolves from few-photon architectures to systems capable of generating and processing tens,possibly hundreds,of photons,marking critical progress toward scalable quantum information processing.Although each integrated platform has its own unique advantages and limitations,thin-film lithium niobate(TFLN)photonics has recently emerged as a strong contender thanks to its low-loss characteristics,large electro-optic and nonlinear coefficients,broad transparency window,and ultra-fast modulation capabilities.In this review,we examine the latest developments in TFLN quantum photonics and identify promising directions and challenges for future research in this field.
基金the National Natural Science Foundation of China(91836303)the National Key R&D Program of China(2019YFA0308700)+1 种基金the Chinese Academy of Sciences,the Anhui Initiative in Quantum Information Technologies,the Natural Science Foundation of Shandong Province(ZR2020LLZ007)the ShanghaiMunicipal Science and Technology Major Project(2019SHZDZX01).
文摘In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with Purcell enhancement),interconnectivity with spin qubits,and a scalable on-chip platform.However,in the past two decades,the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50%,and the distances were limited from a few meters to kilometers.Here,we report quantum interference between two single photons from independent QDs separated by a 302 km optical fiber.The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities.Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band.The observed interference visibility is 0.670.02(0.930.04)without(with)temporal filtering.Feasible improvements can further extend the distance to∼600 km.Our work represents a key step to long-distance solid-state quantum networks.
