A5042898854- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Chaos-based Image/Signal Encryption
- Advanced Optical Network Technologies
- Optical Network Technologies
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
Beijing University of Posts and Telecommunications
2017-2021
The continuous-variable version of quantum key distribution (QKD) offers the advantages (over discrete-variable systems) higher secret rates in metropolitan areas as well use standard telecom components that can operate at room temperature. An important step real-world adoption QKD is deployment field tests over commercial fibers. Here we report two different a system through fiber networks Xi'an and Guangzhou distances 30.02 km (12.48 dB) 49.85 (11.62 dB), respectively. We achieve secure...
We demonstrate a 6 Gbps real-time optical quantum random number generator by measuring vacuum fluctuation. To address the common problem that speed gap exists between fast randomness generation and slow extraction in most high-speed systems, we present an optimized algorithm based on parallel implementation of Toeplitz hashing to reduce influence classical noise due imperfection devices. Notably, rate have achieved reaches highest 12 occupying less computing resources has ability support...
A bias-free source-independent quantum random number generator scheme based on the measurement of vacuum fluctuation is proposed to realize effective elimination system bias and common mode noise introduced by local oscillator. Optimal parameter settings are derived avoid recording two canonically conjugate quadratures simultaneously in each measurement. In particular, it provides a new approach investigate performance difference between measuring equal unequal intensity. It experimentally...
A quantum random-number generator (QRNG) can theoretically generate unpredictable random numbers with perfect devices and is an ideal secure source of for cryptography. However, the practical implementations always contain imperfections, which will greatly influence randomness final output even open loopholes to eavesdroppers. Recently, Thewes et al. experimentally demonstrated a continuous-variable eavesdropping attack, based on heterodyne detection, trusted QRNG in Phys. Rev. 100, 052318...
Abstract In the practical continuous-variable source-independent quantum random number generator, it is usually necessary to introduce a local oscillator amplify received signal due its weak intensity. However, intensity fluctuation of itself will lead deviation in evaluating randomness without monitoring real time and calibrating each output measurement, which inevitably open loophole for eavesdropper intercept information generated numbers. Here, we present an eavesdropping attack...
Clock synchronization is crucial for a practical continuous-variable quantum key distribution system to precisely get the measurement result. Three different schemes are presented demonstrate optimal scheme. The performance of scheme evaluated by measuring excess noise which critical parameter system. experiment results show that distilling signal from local oscillator has simplest physical implemention and superior effect synchronization, but stronger required. Transmitting in same fiber...
We experimentally demonstrate a bias-free optical quantum random number generator with real-time randomness extraction to directly output uniform distributed numbers by measuring the vacuum fluctuation of state. A phase modulator is utilized in scheme effectively reduce influence deviations between two arms caused imperfect practical devices, which an innovative solution field generator. In case where feedback modulation frequency much faster than jitter, unbiased result can be obtained...
We study the impact of finite-size effect on continuous variable source-independent quantum random number generation. The central-limit theorem and maximum likelihood estimation are used to derive formula which could output statistical fluctuations determine upper bound parameters practical With these results, we can see check data length confidence probability has intense relevance final randomness, be adjusted according demand in implementation. Besides, other key parameters, such as...
We experimentally demonstrate an optical quantum random number generator with real-time randomness extraction to directly output Gaussian distributed numbers by measuring the vacuum fluctuation of state. A tight estimation and a extractor are proposed eliminate influence side information introduced imperfect devices in practical system. The generation can simply procedure reduce calculation error optimizing that transforms uniform into numbers. And calculated be utilized transformed unique...
We experimentally demonstrate a bias-free optical quantum random number generator with real-time randomness extraction to directly output uniform distributed numbers by measuring the vacuum fluctuation of state. A phase modulator is utilized in scheme effectively reduce influence deviations between two arms caused imperfect practical devices, which an innovative solution field generator. In case where feedback modulation frequency much faster than jitter, unbiased result can be obtained...
We present a source-independent quantum random number generator based on the measurement of quadrature optical field by applying modified entropic uncertainty relation to circumvent range problem under certain conditions.