We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet.At a pump power of 800μW,the photon pairs generation rate reaches 6.9 MHz with th...We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet.At a pump power of 800μW,the photon pairs generation rate reaches 6.9 MHz with the coincidence-toaccidental ratio[CAR]better than 1150.The long-term stability of the biphoton source is characterized by measuring the Hong-Ou-Mandel interference visibility and CAR within a continuous operation period of more than 10 h.Benefiting from the advantages of compact size,light weight,and high stability,this device provides a convenient resource for various field turnkey quantum communication and metrology applications.展开更多
Quantum imaging with spatially entangled photons offers advantages such as enhanced spatial resolution,robustness against noise,and counterintuitive phenomena,while a biphoton spatial aberration generally degrades its...Quantum imaging with spatially entangled photons offers advantages such as enhanced spatial resolution,robustness against noise,and counterintuitive phenomena,while a biphoton spatial aberration generally degrades its performance.Biphoton aberration correction has been achieved by using classical beams to detect the aberration source or scanning the correction phase on biphotons if the source is unreachable.Here,a new method named position-correlated biphoton Shack-Hartmann wavefront sensing is introduced,where the phase pattern added on photon pairs with a strong position correlation is reconstructed from their position centroid distribution at the back focal plane of a microlens array.Experimentally,biphoton phase measurement and adaptive imaging against the disturbance of a plastic film are demonstrated.This single-shot method is a more direct and efficient approach toward quantum adaptive optics,suitable for integration into quantum microscopy,remote imaging,and communication.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12033007,61875205,91836301,12103058,and 61801458)the Western Young Scholar Project of CAS(Nos.XAB2019B17 and XAB2019B15)+2 种基金the Frontier Science Key Research Project of CAS(No.QYZDB-SSWSLH007)the Strategic Priority Research Program of CAS(No.XDC07020200)the Youth Innovation Promotion Association,CAS(Nos.2022413 and 2021408)。
文摘We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet.At a pump power of 800μW,the photon pairs generation rate reaches 6.9 MHz with the coincidence-toaccidental ratio[CAR]better than 1150.The long-term stability of the biphoton source is characterized by measuring the Hong-Ou-Mandel interference visibility and CAR within a continuous operation period of more than 10 h.Benefiting from the advantages of compact size,light weight,and high stability,this device provides a convenient resource for various field turnkey quantum communication and metrology applications.
基金funded by the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0301200 and 2021ZD0301400)the National Natural Science Foundation of China(Grant Nos.92365205,11821404,and W2411001)the USTC Major Frontier Research Program(Grant No.LS2030000002).
文摘Quantum imaging with spatially entangled photons offers advantages such as enhanced spatial resolution,robustness against noise,and counterintuitive phenomena,while a biphoton spatial aberration generally degrades its performance.Biphoton aberration correction has been achieved by using classical beams to detect the aberration source or scanning the correction phase on biphotons if the source is unreachable.Here,a new method named position-correlated biphoton Shack-Hartmann wavefront sensing is introduced,where the phase pattern added on photon pairs with a strong position correlation is reconstructed from their position centroid distribution at the back focal plane of a microlens array.Experimentally,biphoton phase measurement and adaptive imaging against the disturbance of a plastic film are demonstrated.This single-shot method is a more direct and efficient approach toward quantum adaptive optics,suitable for integration into quantum microscopy,remote imaging,and communication.
