The recent emergence of thin-film lithium niobate(TFLN)has extended the landscape of integrated photonics.This has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high...The recent emergence of thin-film lithium niobate(TFLN)has extended the landscape of integrated photonics.This has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high-quality dry etching.However,fabrication imperfections still limit the propagation loss to a few dB/m,restricting the impact of this platform.Here,we demonstrate TFLN microresonators with a record-high intrinsic quality(Q)factor of twenty-nine million,corresponding to an ultra-low propagation loss of 1.3 dB/m.We present spectral analysis and the statistical distribution of Q factors across different resonator geometries.Our work pushes the fabrication limits of TFLN photonics to achieve a Q factor within 1 order of magnitude of the material limit.展开更多
Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch ...Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum systems.However,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated chip.Here,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLN)phase modulator.We achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon pairs.We further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single photons.Our results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.展开更多
基金Defense Advanced Research Projects Agency(HR001120C0137)U.S.Navy(N68335-22-C-0413)+6 种基金Air Force Office of Scientific Research(FA9550-20-1-01015)Air Force Research Laboratory(FA864921P0781)National Aeronautics and Space Administration(80NSSC22K0262,80NSSC23PB442)National Science Foundation(EEC-1941583,OMA-2137723,2138068)Office of Naval Research(N00014-22-C-1041)National Institutes of Health(5R21EY031895-02)National Research Foundation of Korea。
文摘The recent emergence of thin-film lithium niobate(TFLN)has extended the landscape of integrated photonics.This has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high-quality dry etching.However,fabrication imperfections still limit the propagation loss to a few dB/m,restricting the impact of this platform.Here,we demonstrate TFLN microresonators with a record-high intrinsic quality(Q)factor of twenty-nine million,corresponding to an ultra-low propagation loss of 1.3 dB/m.We present spectral analysis and the statistical distribution of Q factors across different resonator geometries.Our work pushes the fabrication limits of TFLN photonics to achieve a Q factor within 1 order of magnitude of the material limit.
基金supported by Harvard Quantum Initiative(HQI),ARO/DARPA(W911NF2010248),AFOSR(FA9550-20-1-01015),DARPA LUMOS(HR0011-20-C-0137),DOE(DE-SC0020376),NSF(EEC-1941583,ECCS-1839197),and AFRL(FA9550-21-1-0056)support by HQI post-doctoral fellowship and A*STAR SERC Central Research Fund(CRF)support by the AQT Intelligent Quantum Networks and Technologies(INQNET)research program.
文摘Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum systems.However,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated chip.Here,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLN)phase modulator.We achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon pairs.We further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single photons.Our results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.
