Sparse matrix operations are widely used in computational science and engineering applications such as quantum chemistry and finite element analysis,as well as modern machine learning scenarios such as social network ...Sparse matrix operations are widely used in computational science and engineering applications such as quantum chemistry and finite element analysis,as well as modern machine learning scenarios such as social network and compressed deep neural networks.The University of California,Berkeley in the famous article‘A View of the Parallel Computing Landscape’,Asanovic et al.展开更多
The reliable detection of entanglement plays a crucial role in the construction of quantum networks.The conventional entanglement witness(EW)method has high requirements for measurement device and relies on reliable i...The reliable detection of entanglement plays a crucial role in the construction of quantum networks.The conventional entanglement witness(EW)method has high requirements for measurement device and relies on reliable implementation of the measurement.With unreliable measurement device,EW process can be easily attacked by eavesdroppers,which can lead to incorrect entanglement detection results.Therefore,a feasible and secure measurement device independent entanglement witness(MDIEW)method is desired for constructing quantum networks.Here,we detect the continuous variable entanglement by a MDIEW in a quantum network.It is demonstrated that the conventional EW method can be affected when the local oscillator intensity is changed,while the MDIEW method can detect entanglement between users without being affected.Our results provide a trustworthy method to detect entanglement,which is an important step for constructing secure quantum networks.展开更多
Quantum teleportation is a crucial function in quantum networks.The implementation of photonic quantum teleportation could be highly simplified by quantum photonic circuits.To extend chip-to-chip teleportation distanc...Quantum teleportation is a crucial function in quantum networks.The implementation of photonic quantum teleportation could be highly simplified by quantum photonic circuits.To extend chip-to-chip teleportation distance,more effort is needed on both chip design and system implementation.In this work,we demonstrate a time-bin-based chip-to-chip photonic quantum teleportation over optical fibers under the scenario of a star-topology quantum network.Three quantum photonic circuits are designed and fabricated on a single chip,each serving specific functions:heralded single-photon generation at the user node,entangled photon pair generation and BSM at the relay node,and projective measurement of the teleported photons at the central node.The unbalanced Mach-Zehnder interferometers(UMZI)for time-bin encoding in these quantum photonic circuits are optimized to reduce insertion losses and suppress noise photons generated on the chip.Besides,an active feedback system is employed to suppress the impact of fiber length fluctuation between the circuits,achieving a stable quantum interference for the BSM in the relay node.As a result,a photonic quantum teleportation over optical fibers of 12.3 km is achieved based on these quantum photonic circuits,showing the potential ofchip integration for the development of quantum networks.展开更多
The storage of quantum states and information is essential for enabling large quantum networks.The direct implementation of storage in magnonic systems,which are emerging as crucial components in quantum networks,has ...The storage of quantum states and information is essential for enabling large quantum networks.The direct implementation of storage in magnonic systems,which are emerging as crucial components in quantum networks,has also garnered attention.In this study,we present experimental investigations of magnomechanical microwave storage for the first time.By reducing the ambient temperature to 8 K,we can achieve a mechanical mode with a narrow linewidth as low as 6.4 Hz,resulting in an energy decay time of 24.8 ms.Furthermore,we employ Ramsey interferometry to investigate the coherence of the magnomechanical memory.The mechanical interference can be utilized to evaluate the decoherence lifetime of 19.5 ms.Our proposed scheme provides the potential to utilize magnomechanical systems as quantum memory for photonic quantum information.展开更多
文摘Sparse matrix operations are widely used in computational science and engineering applications such as quantum chemistry and finite element analysis,as well as modern machine learning scenarios such as social network and compressed deep neural networks.The University of California,Berkeley in the famous article‘A View of the Parallel Computing Landscape’,Asanovic et al.
基金funded by the National Natural Science Foundation of China(NSFC,No.12225404,No.12434014,No.11874155,No.91436211,No.11374104,No.12174110,No.12574390,and No.12474357)Innovation Program for Quantum Science and Technology(No.2024ZD0302402)+10 种基金Innovation Program of Shanghai Municipal Education Commission(No.2021-01-07-00-08-E00100)Program of Shanghai Academic Research Leader(No.22XD1400700)Basic Research Project in Quantum Science of Shanghai Action Plan for Science Technology and Innovation(No.24LZ1400700)Fundamental Research Funds for the Central UniversitiesBasic Research Project of Shanghai Science and Technology Commission(No.20JC1416100)Natural Science Foundation of Shanghai(No.17ZR1442900,No.24ZR1418700)Minhang Leading Talents(No.201971)Shanghai Sailing Program(No.21YF1410800)Natural Science Foundation of Chongqing(No.CSTB2022NSCQ-MSX0893)Shanghai Municipal Science and Technology Major Project(No.2019SHZDZX01)and the 111 project(B12024).
文摘The reliable detection of entanglement plays a crucial role in the construction of quantum networks.The conventional entanglement witness(EW)method has high requirements for measurement device and relies on reliable implementation of the measurement.With unreliable measurement device,EW process can be easily attacked by eavesdroppers,which can lead to incorrect entanglement detection results.Therefore,a feasible and secure measurement device independent entanglement witness(MDIEW)method is desired for constructing quantum networks.Here,we detect the continuous variable entanglement by a MDIEW in a quantum network.It is demonstrated that the conventional EW method can be affected when the local oscillator intensity is changed,while the MDIEW method can detect entanglement between users without being affected.Our results provide a trustworthy method to detect entanglement,which is an important step for constructing secure quantum networks.
基金supported by the National Natural Science Foundation of China(92365210,W.Z.)the National Key R&D Program of China(2023YFB2806700,Y.H.)+2 种基金the Innovation Program for Quantum Science and Technology(2023ZD0300100,L.Y.)the Tsinghua Initiative Scientific Research Program(W.Z.)the project of Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies(JIAOT,Y.H.)。
文摘Quantum teleportation is a crucial function in quantum networks.The implementation of photonic quantum teleportation could be highly simplified by quantum photonic circuits.To extend chip-to-chip teleportation distance,more effort is needed on both chip design and system implementation.In this work,we demonstrate a time-bin-based chip-to-chip photonic quantum teleportation over optical fibers under the scenario of a star-topology quantum network.Three quantum photonic circuits are designed and fabricated on a single chip,each serving specific functions:heralded single-photon generation at the user node,entangled photon pair generation and BSM at the relay node,and projective measurement of the teleported photons at the central node.The unbalanced Mach-Zehnder interferometers(UMZI)for time-bin encoding in these quantum photonic circuits are optimized to reduce insertion losses and suppress noise photons generated on the chip.Besides,an active feedback system is employed to suppress the impact of fiber length fluctuation between the circuits,achieving a stable quantum interference for the BSM in the relay node.As a result,a photonic quantum teleportation over optical fibers of 12.3 km is achieved based on these quantum photonic circuits,showing the potential ofchip integration for the development of quantum networks.
基金funding provided by Shanghai Jiao Tong Universitysupported by the Innovation program for Quantum Science and Technology(2021ZD0303203)+3 种基金National Natural Science Foundation of China(Grant No.12293052,11934012,12104442,92050109,and 92250302)the CAS Project for Young Scientists in Basic Research(YSBR-069)Anhui Provincial Natural Science Foundation(Grant No.2308085J12)the Fundamental Research Funds for the Central Universities.
文摘The storage of quantum states and information is essential for enabling large quantum networks.The direct implementation of storage in magnonic systems,which are emerging as crucial components in quantum networks,has also garnered attention.In this study,we present experimental investigations of magnomechanical microwave storage for the first time.By reducing the ambient temperature to 8 K,we can achieve a mechanical mode with a narrow linewidth as low as 6.4 Hz,resulting in an energy decay time of 24.8 ms.Furthermore,we employ Ramsey interferometry to investigate the coherence of the magnomechanical memory.The mechanical interference can be utilized to evaluate the decoherence lifetime of 19.5 ms.Our proposed scheme provides the potential to utilize magnomechanical systems as quantum memory for photonic quantum information.
