A5023633659- Quantum Information and Cryptography
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Laser-Matter Interactions and Applications
- Neural Networks and Reservoir Computing
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Random lasers and scattering media
- Photonic Crystals and Applications
- Optical Network Technologies
- Molecular Communication and Nanonetworks
- Plasmonic and Surface Plasmon Research
- Optical Wireless Communication Technologies
- Advanced Fluorescence Microscopy Techniques
- Chaos-based Image/Signal Encryption
- Quantum Electrodynamics and Casimir Effect
- Metamaterials and Metasurfaces Applications
- Terahertz technology and applications
- Non-Invasive Vital Sign Monitoring
- Optical Coherence Tomography Applications
- Nonlinear Photonic Systems
Nanjing University
2013-2025
Collaborative Innovation Center of Advanced Microstructures
2013-2024
University of Science and Technology of China
2007-2024
Chinese Academy of Sciences
2024
Suzhou Institute of Biomedical Engineering and Technology
2024
National Laboratory of Solid State Microstructures
2021-2023
Sun Yat-sen University
2020
Southeast University
2009-2016
Centre for Quantum Computation and Communication Technology
2008
The University of Queensland
2008
A consequent tendency toward high-performance quantum information processing is to develop the fully integrated photonic chip. Here, we report on-chip generation and manipulation of entangled photons based on reconfigurable lithium-niobate waveguide circuits. By introducing a periodically poled structure into circuits, two individual photon-pair sources with controllable electro-optic phase shift are produced within Hong-Ou-Mandel interferometer, resulting in deterministically separated...
Entanglement distribution has been accomplished using a flying drone, and this mobile platform can be generalized for multiple nodes with optical relay among them. Here we develop the first to reshape wave front of photons their low diffraction loss in free-space transmission. Using two drones, where one distributes entangled other serves as node, achieve entanglement Clauser-Horne-Shimony-Holt S parameter 2.59±0.11 at 1 km distance. Key components source, tracking, are developed high...
The quantum satellite is a cornerstone towards practical free-space network and overcomes the photon loss over large distance. However, challenges still exist including real-time all-location coverage multi-node construction, which may be complemented by diversity of modern drones. Here we demonstrate first drone-based entanglement distribution at all-weather conditions 200 meters (test field limited), Clauser-Horne-Shimony-Holt S-parameter exceeds 2.49, within 35 kg take-off weight. With...
Lithium niobate on insulator (LNOI) is a unique platform for integrated photonic applications and especially high-efficiency nonlinear frequency converters because of the strong optical field confinement. In this work, we fabricated 6-mm-long periodically poled LNOI ridge waveguide with an optimized duty cycle (50:50) using active domain structure monitoring method. The performance single-pass second-harmonic generation difference-frequency in nanophotonic was characterized, normalized...
A high-flux entangled-photon source is a key resource for quantum optical study and application. Here, it realized in lithium niobate on isolator (LNOI) chip, with 2.79 \ifmmode\times\else\texttimes\fi{} ${10}^{11}$ Hz/mW photon-pair rate 1.53 ${10}^{9}$ Hz/(nm mW) spectral brightness. These data are boosted by over 2 orders of magnitude compared existing technologies. 160-nm-broad bandwidth engineered eight-channel multiplexed energy-time entanglement. Harnessed high-extinction-frequency...
Communication in quantum wireless multihop networks is useful global networks. We propose a scheme for faithful communication networks, by performing teleportation between two distant nodes which do not initially share entanglement with each other. The required among intermediate established through swapping based on arbitrary types of Bell pairs. All the measurement outcomes and pairs are sent to destination node independently. initial state can be finally recovered corresponding local...
Qubit entanglement is a valuable resource for quantum information processing, where increasing its dimensionality provides pathway towards higher capacity and increased error resilience in communications, cluster computation phase measurements. Time-frequency entanglement, continuous variable subspace, enables the high-dimensional encoding of multiple qubits per particle, bounded only by spectral correlation bandwidth readout timing jitter. Extending from two discrete polarization variables,...
An integrated realization of photonic entangled states becomes an inevitable tendency toward quantum optics. Here we report the compact engineering steerable path-entangled from a monolithic quadratic nonlinear crystal. The crystal acts as coherent beam splitter to distribute photons into designed spatial modes, producing heralded single-photon and appealing beamlike two-photon path entanglement. We characterize entanglement by implementing beating experiments. Such multifunctional source...
Abstract Photonic quantum information processing system has been widely used in communication, metrology and lithography. The recent emphasis on the miniaturized photonic platform is thus motivated by urgent need for realizing large-scale computing. Although integrated logic gates algorithms based path encoding have successfully demonstrated, technology handling another commonly polarization-encoded qubits yet to be fully developed. Here, we show implementation of a polarization-dependent...
We propose two schemes for realizing quantum secure direct communication (QSDC) by using a set of ordered two-photon three-dimensional hyperentangled states entangled in degrees freedom (DOFs) as information channels. In the first scheme, photons from Bob to Alice are transmitted only once. After insuring security channels, encodes secret message on his photons. Then performs single-photon two-DOF Bell bases measurements her This scheme has better than former QSDC protocols. second transmits...
<title>Abstract</title> Quantum photonic chip is a powerful platform to prepare multi-functional quantum light sources and actualize complex information processing for its advantages of integration, stability, mass production, reconfigurability. In this work, we design fabricate lithium niobate chip, consisting tandem multi-poling structures, Mach-Zehnder interferometers, electro-optic modulation, produce multiple near-ideal including anti-bunching, path frequency entangled photon pairs. The...
We consider the realization of a quantum Fredkin gate with only linear optics and single photons. First we construct heralded using four controlled-NOT (CNOT) gates. Then simplify this method to post-selected one utilizing two CNOT also give possible which is feasible current experimental technology. Another scheme requires time entanglement input photons but needs no ancillary
We present observable upper bounds for the squared concurrence, which are dual inequalities of lower introduced by Mintert and Buchleitner [Phys. Rev. Lett. 98, 140505 (2007)] Aolita et al. A 78, 022308 (2008)]. These can be used to estimate entanglement arbitrary experimental unknown finite-dimensional states a few measurements on twofold copy $\ensuremath{\rho}\ensuremath{\bigotimes}\ensuremath{\rho}$ mixed states. Furthermore, degree mixing state some properties linear entropy also have...
We present an experimental test of quantum contextuality by using two-photon product states. The results show that the noncontextual hidden-variable theories are violated nonentangled states in spite local can be or not. find Hong-Ou-Mandel-type interference effect causes contextuality.
We propose a scheme for the generation of counterpropagating polarization-entangled photon pairs from dual-periodically-poled crystal. Compared with usual forward-wave-type source, this in backward-wave way, has much narrower bandwidth. With 2-cm-long bulk crystal, bandwidths example sources are estimated to be $3.6$ GHz, and spectral brightnesses more than 100 pairs$/$(s GHz mW). Two concurrent quasi-phase-matched spontaneous parametric down-conversion processes single crystal enable our...
Many previous studies about teleportation are based on pure state. Study of quantum channel as mixed state is more realistic but complicated states degenerate into by interaction with environment, and the Werner plays an important role in study In this paper, wireless multihop network proposed information transmitted hop through teleportation. We deduce a specific expression recovered not only after one-hop also across multiple intermediate nodes network. obtain fidelity
Quantum random number generators (QRNGs) can provide genuine randomness by exploiting the intrinsic probabilistic nature of quantum mechanics, which play important roles in many applications. However, true acquisition could be subjected to attacks from untrusted devices involved or their deviations theoretical modeling real-life implementation. We propose and experimentally demonstrate a source-device-independent QRNG, enables one access bits with an source device. The are generated...
We propose and demonstrate experimentally a projection scheme to measure the quantum phase with precision beating standard limit. The initial input state is twin Fock |N,N⟩ proposed by Holland Burnett (Phys. Rev. Lett., 71 (1993) 1355) but information extracted measurement. about 1.4/N for large photon number N, which approaches Heisenberg limit of 1/N. Experimentally, we employ four-photon from type-II parametric down-conversion achieve uncertainty 0.291±0.001 four photons.
We present an experimental realization of a compact and reliable way to build nondegenerate polarization-entangled photon-pair source based on dual-periodically-poled $ {\rm Ti}:{{\rm LiNbO}_3} $Ti:LiNbO3 waveguide, which is in the telecommunication window compatible with fiber quantum networks. The dual-periodic structure allows two inherently concurrent quasiphase-matching spontaneous parametric down-conversion processes pumped by single laser beam, hence enabling our be stable. show that...
We present a scheme for teleporting an unknown three-particle entangled W state from sender to either of two receivers. Two partial states are used as the quantum channel. The success probability teleportation depends on entanglement degree shared states, which equals 4/9 channel composed maximally states. proposed can be generalized transmit m-particle any m-1 receiver and will applied long-distance transmission well.
Quantum state transferring has been demonstrated using drones via entanglement distribution. Here, we demonstrate the first drone-based quantum task for key distribution (QKD). Compact and polarization-maintaining acquisition, pointing, tracking systems QKD modules are developed loaded on a homemade octocopter with takeoff weight of 30 kg. Real-time is performed over 200 m distance an 8.48 kHz average secret rate polarization-coded decoy-state BB84 protocol. With capability drone, wireless...
We studied the quantum properties of magnetic plasmon waves in a three-dimensional coupled metamaterial. A Hong-Ou-Mandel dip two-photon interference with visibility 86 ± 6.0% was explicitly observed, when sample inserted into one two arms interferometer. This meant that property survived such wave-mediated transmission process, thus testifying owned nature. full model utilized to describe our experimental results. The results showed metamaterials could not only steer classical light but...