A5100433129- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Advanced Optical Sensing Technologies
- Advanced Fluorescence Microscopy Techniques
- Quantum optics and atomic interactions
- Ocular and Laser Science Research
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Random lasers and scattering media
- Laser-Matter Interactions and Applications
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Optical Imaging and Spectroscopy Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Computational Techniques and Applications
- CCD and CMOS Imaging Sensors
- Integrated Circuits and Semiconductor Failure Analysis
- Chaos-based Image/Signal Encryption
- Advanced Semiconductor Detectors and Materials
- Optical Coherence Tomography Applications
Hefei National Center for Physical Sciences at Nanoscale
2015-2025
University of Science and Technology of China
2016-2025
Nanyang Technological University
2022-2024
Hefei University
2024
Jinan University
2016-2024
Hubei University of Technology
2024
Aero Engine Corporation of China (China)
2024
Beijing Academy of Quantum Information Sciences
2021-2023
Hubei University of Automotive Technology
2023
Chinese Academy of Engineering
2023
A central theme in quantum information science is to coherently control an increasing number of particles as well their internal and external degrees freedom (DoFs), meanwhile maintaining a high level coherence. The ability create verify multiparticle entanglement with individual measurement each qubit serves important benchmark for technologies. To this end, genuine multipartite have been reported up 14 trapped ions, 10 photons, superconducting qubits. Here, we experimentally demonstrate...
We study non-local two-qubit operations from a geometric perspective. By applying Cartan decomposition to su(4), we find that the structure of gates is 3-Torus. derive invariants for local transformations, and connect these coordinates Since different points on 3-Torus may correspond same equivalence class, use Weyl group theory reduce symmetry. show classes are in one-to-one correspondence with tetrahedron except base. then properties perfect entanglers, is, can generate maximally entangled...
We demonstrate the decoy-state quantum key distribution (QKD) with one-way communication in polarization space over 102 km. Further, we simplify experimental setup and use only one detector to implement QKD 75 km, advantage overcome security loopholes due efficiency mismatch of detectors. Our implementation can really offer unconditionally secure final keys. 3 different intensities 0, 0.2, 0.6 for light sources our experiment. In order eliminate influences mode dispersion long-distance...
Single-photon detectors (SPDs) are the most sensitive instruments for light detection. In near-infrared range, SPDs based on III–V compound semiconductor avalanche photodiodes have been extensively used during past two decades diverse applications due to their advantages in practicality including small size, low cost and easy operation. decade, rapid developments increasing demands quantum information science served as key drivers improve device performance of single-photon diodes invent new...
Quantum key distribution (QKD) provides information-theoretic security based on the laws of quantum mechanics.The desire to reduce costs and increase robustness in realworld applications has motivated study coexistence between QKD intense classical data traffic a single fiber.Previous works metropolitan areas have used wavelength-division multiplexing, however, backbone fiber networks remains great experimental challenge, as Tbps up 20 dBm optical power is transferred, much more noise...
Long-range active imaging has a variety of applications in remote sensing and target recognition. Single-photon LiDAR (light detection ranging) offers single-photon sensitivity picosecond timing resolution, which is desirable for high-precision three-dimensional (3D) over long distances. Despite important progress, further extending the range presents enormous challenges because only weak echo photons return are mixed with strong noise. Herein, we tackled these by constructing...
Significance Non–line-of-sight (NLOS) imaging can recover details of a hidden scene from the indirect light that has scattered multiple times. Despite recent advances, NLOS remained at short-range verifications. Here, both experimental and conceptual innovations yield hardware software solutions to increase meter kilometer range. This range is about three orders magnitude longer than previous experiments. The results will open avenues for development techniques relevant applications...
We report free-space distribution of entangled photon pairs over a noisy ground atmosphere 13km. It is shown that the desired entanglement can still survive after two photons have passed through atmosphere. This confirmed by observing space-like separated violation Bell inequality $2.45 \pm 0.09$. On this basis, we exploit distributed source to demonstrate BB84 quantum cryptography scheme. The distance achieved in experiment for first time well beyond effective thickness aerosphere, hence...
The speed of a quantum random number generator is essential for practical applications, such as high-speed key distribution systems. Here, we push the to 68 Gbps by operating laser around its threshold level. To achieve rate, not only photodetector and high sampling rate are needed but also very stable interferometer required. A with active feedback instead common temperature control developed meet requirement stability. Phase fluctuations measured then digitalized raw numbers 80 Gbps....
Precise identification of parameters governing quantum processes is a critical task for information and communication technologies. In this Letter, we consider setting where system evolution determined by parametrized Hamiltonian, the to estimate these from temporal records restricted set observables (time traces). Based on notion realization linear systems theory, develop constructive algorithm that provides estimates unknown directly time traces. We illustrate its robustness measurement...
We present a practical high-speed quantum random number generator, where the timing of single-photon detection relative to an external time reference is measured as raw data. The bias data can be substantially reduced compared with previous realizations. bit rate our generator reach 109 Mbps. develop model for and evaluate min-entropy Toeplitz matrix hashing applied randomness extraction, after which final bits are able pass standard tests.
Single-photon light detection and ranging (LiDAR), offering single-photon sensitivity picosecond time resolution, has been widely adopted for active imaging applications. Long-range is a great challenge, because the spatial resolution degrades significantly with range due to diffraction limit of optics, only weak echo signal photons can return but mixed strong background noise. Here we propose demonstrate photon-efficient LiDAR approach that achieve sub-Rayleigh over long ranges. This...
We present a fully integrated InGaAs/InP negative feedback avalanche diode (NFAD) based free-running single-photon detector (SPD) designed for accurate lidar applications.A freepiston Stirling cooler is used to cool down the NFAD with large temperature range, and an active hold-off circuit implemented in field programmable gate array applied further suppress afterpulsing contribution.The key parameters of SPD including photon detection efficiency (PDE), dark count rate (DCR), afterpulse...
Quantum random number generators (QRNGs) can produce true numbers. Yet, the two most important QRNG parameters highly desired for practical applications, i.e., speed and size, have to be compromised during implementations. Here, we present fastest miniaturized with a record real-time output rate as high 18.8 Gbps by combining photonic integrated chip technology of optimized randomness extraction. We assemble circuit designed vacuum state implementation, an InGaAs homodyne detector,...
Randomness expansion where one generates a longer sequence of random numbers from short is viable in quantum mechanics but not allowed classically. Device-independent randomness provides resource the highest security level. Here, we report first experimental realization device-independent secure against side information established through probability estimation. We generate $5.47\ifmmode\times\else\texttimes\fi{}{10}^{8}$ quantum-proof bits while consuming...
We give detailed insight into photon counting OTDR (nu-OTDR) operation, ranging from Geiger mode operation of avalanche photodiodes (APD), analysis different APD bias schemes, to the discussion perspectives. Our results demonstrate that an InGaAs/InP based nu-OTDR has potential outperforming dynamic range a conventional state-of-the-art by 10 dB as well 2-point resolution factor 20. Considering trace acquisition speed nu-OTDRs, we find combination rapid gating for high flux and free running...
We develop and exploit a source of two-photon four-dimensional entanglement to report the first two-particle all-versus-nothing test local realism with linear optics setup, but without resorting non-contextuality ssumption. Our experimental results are in well agreement quantum mechanics while extreme contradiction realism. Potential applications our experiment briefly discussed.
The existing theory of decoy-state quantum cryptography assumes the exact control each state from Alice's source. Such is impossible in practice. We develop method so that it unconditionally secure even if there are errors sources, range a few parameters states known. This simplifies practical implementation key distribution because unconditional security can be achieved with slightly shortened final key, though small pulses not corrected.